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  • 1.
    Aaboud, M.
    et al.
    Univ Mohamed Premier, Fac Sci, Oujda, Morocco.;LPTPM, Oujda, Morocco..
    Kastanas, Konstatinos A.
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Lund-Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ohm, Christian
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Zwalinski, L.
    CERN, Geneva, Switzerland..
    et al.,
    Measurement of jet fragmentation in 5.02 TeV proton-lead and proton-proton collisions with the ATLAS detector2018In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 978, p. 65-106Article in journal (Refereed)
    Abstract [en]

    A measurement of the fragmentation functions of jets into charged particles in p Pb collisions and pp collisions is presented. The analysis utilizes 28 nb(-1) of p Pb data and 26 pb(-1) of pp data, both at root(TN)-T-s= 5.02 TeV, collected in 2013 and 2015, respectively, with the ATLAS detector at the LHC. The measurement is reported in the centre-of-mass frame of the nucleon-nucleon system for jets in the rapidity range vertical bar y*vertical bar <1.6 and with transverse momentum 45 < p(T) < 260 GeV. Results are presented both as a function of the charged-particle transverse momentum and as a function of the longitudinal momentum fraction of the particle with respect to the jet. The pp fragmentation functions are compared with results from Monte Carlo event generators and two theoretical models. The ratios of the p +Pb to pp fragmentation functions are found to be consistent with unity.

  • 2. Aad, G.
    et al.
    Grahn, Karl-Johan
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Lund-Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    zur Nedden, M.
    et al.,
    The ATLAS Collaboration2009In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 830, no 1-4, p. 925c-940cArticle in journal (Refereed)
  • 3. Andreyev, A. N.
    et al.
    Huyse, M.
    Van Duppen, P.
    Weissman, L.
    Ackermann, D.
    Gerl, J.
    Hessberger, F. P.
    Hofmann, S.
    Kleinbohl, A.
    Munzenberg, G.
    Reschitko, S.
    Schlegel, C.
    Schaffner, H.
    Cagarda, P.
    Matos, M.
    Saro, S.
    Keenan, A.
    Moore, C. J.
    O'Leary, C. D.
    Page, R. D.
    Taylor, M. J.
    Kettunen, H.
    Leino, M.
    Lavrentiev, A.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Heyde, K.
    The discovery of a prolate-oblate-spherical shape triple of spin 0(+) states in the atomic nucleus Pb-1862001In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 682, p. 482C-486CArticle in journal (Refereed)
    Abstract [en]

    Two excited J(pi)=0(+) states in Pb-186 populated in the a-decay of Po-190 have been identified through alpha -particle/conversion electron coincidences in an experiment at the velocity filter SHIP. The parent Po-190 nuclei have been produced in the Nd-142(Cr-52,4n)Po-190 complete fusion reaction, alpha -particle energies and branching ratios have been measured and hindrance factors were deduced. The observed states have been interpreted as the band heads of the known prolate and (yet unobserved) oblate rotational bands in Pb-186.

  • 4. Angerami, A
    et al.
    Kastanas, Konstatinos A.
    KTH, School of Engineering Sciences (SCI), Physics.
    Lund-Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ripellino, Giulia
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Zwalinski, L.
    et al.,
    Measurements of photo-nuclear jet production in Pb plus Pb collisions with ATLAS2017In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 967, p. 277-280Article in journal (Refereed)
    Abstract [en]

    Ultra-peripheral heavy ion collisions provide a unique opportunity to study the parton distributions in the colliding nuclei via the measurement of photo-nuclear jet production. An analysis of jet production in ultra-peripheral Pb+Pb collisions at root S-NN = 5.02 TeV performed using data collected with the ATLAS detector in 2015 is described. The data set corresponds to a total Pb+Pb integrated luminosity of 0.38 nb(-1). The ultra-peripheral collisions are selected using a combination of forward neutron and rapidity gap requirements. The cross-sections, not unfolded for detector response, are compared to results from PYTHIA Monte Carlo simulations re-weighted to match a photon spectrum obtained from the STARLIGHT model. Qualitative agreement between data and these simulations is observed over a broad kinematic range suggesting that using these collisions to measure nuclear parton distributions is experimentally realisable.

  • 5.
    Balek, Petr
    et al.
    Weizmann Inst Sci, Fac Phys, Dept Particle Phys & Astrophys, 234 Herzl St, IL-76100 Rehovot, Israel..
    Balek, P.
    Weizmann Inst Sci, Dept Particle Phys, Rehovot, Israel..
    Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ohm, Christian
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ripellino, Giulia
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Zwalinski, L.
    CERN, Geneva, Switzerland..
    Charged-hadron suppression in Pb plus Pb and Xe plus Xe collisions measured with the ATLAS detector2019In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 571-574Article in journal (Refereed)
    Abstract [en]

    The ATLAS detector at the LHC recorded 0.49 nb(-1) of Pb+Pb collisions and 25 of pp(-1) collisions, both at the center-of-mass energy 5.02 TeV per nucleon pair. Recently, ATLAS also recorded 30 mu b(-1) of Xe+Xe collisions at the center-of-mass energy 5.44 TeV, which provides a new opportunity to study the system-size dependence of the charged-hadron production in heavy-ion collisions. The large acceptance of the ATLAS detector allows to measure the spectra of charged hadrons in a wide range of pseudorapidity and transverse momentum. The nuclear modification factors R-AA are constructed as a ratio of the spectra measured in Pb+Pb or Xe+Xe collisions to that measured in pp collisions. The R-AA obtained in the two systems are presented for different centrality intervals and the results are discussed.

  • 6.
    Bargholtz, Ch
    et al.
    Stockholms universitet, Fysikum.
    Gerén, Linda
    Stockholms universitet, Fysikum.
    Lindberg, Karl
    Stockholms universitet, Fysikum.
    Tegnér, Per-Erik
    Stockholms universitet, Fysikum.
    Thörngren-Engblom, Pia
    Stockholms universitet, Fysikum.
    Zartova, Irina
    Stockholms universitet, Fysikum.
    Exclusive measurement of two-pion production in the dd->4He pi pi reaction2009In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 825, no 1-2, p. 71-90Article in journal (Refereed)
    Abstract [en]

    The results from the first kinematically complete measurement of the reaction are reported. The aim was to investigate a long standing puzzle regarding the origin of the peculiar ππ-invariant mass distributions appearing in double pion production in light ion collisions, the so-called ABC effect. The measurements were performed at the incident deuteron energies of 712 MeV and 1029 MeV, with the WASA detector assembly at CELSIUS in Uppsala, Sweden. We report the observation of a characteristic enhancement at low ππ-invariant mass at 712 MeV, the lowest energy yet. At the higher energy, in addition to confirming previous experimental observations, our results reveal a strong angular dependence of the pions in the overall centre of mass system. The results are qualitatively reproduced by a theoretical model, according to which the ABC effect is described as resulting from a kinematical enhancement in the production of the pion pairs from two parallel and independent NNdπ sub-processes.

  • 7. Bark, R A
    et al.
    Tormanen, S
    Bäck, Torbjörn
    Cederwall, Bo
    Odegard, S W
    Cocks, J F C
    Helariutta, K
    Jones, P
    Julin, R
    Juutinen, S
    Kankaanpaa, H
    Kettunen, H
    Kuusiniemi, P
    Leino, M
    Muikku, M
    Rahkila, P
    Savelius, A
    Bandcrossings in Os-1711999In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 646, no 4, p. 399-413Article in journal (Refereed)
    Abstract [en]

    The nucleus Os-171 has been populated using the reaction Sn-116(Ni-58,2pn). Four new bands are identified, and the previously known bands are extended in spin, to a maximum of 53/2 (h) over bar. One- and three-quasiparticle configurations are identified, and beta, gamma, and octupole configurations are assigned tentatively. The effects of a possible intruder configuration on the negative parity bands are tested using band-mixing calculations.

  • 8. Bark, R A
    et al.
    Tormanen, S
    Bäck, Torbjörn
    Cederwall, Bo
    Odegard, S W
    Cocks, J F C
    Helariutta, K
    Jones, P
    Julin, R
    Juutinen, S
    Kankaanpaa, H
    Kettunen, H
    Kuusiniemi, P
    Leino, M
    Muikku, M
    Rahkila, P
    Savelius, A
    Bergstrom, M
    Ingebretsen, F
    Maj, A
    Mattiuzzi, M
    Mueller, W
    Riedinger, L L
    Saitoh, T
    Tjom, P O
    Coexistence of triaxial and prolate shapes in Ir-1711999In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 657, no 2, p. 113-133Article in journal (Refereed)
    Abstract [en]

    Excited states in Ir-171 have been observed for the first time. Gamma-rays were assigned to the nucleus by the recoil-decay tagging method, The ground-state band has a structure consistent with an h(11/2) proton coupled to a core of large triaxial deformation. At high spins, a bandcrossing occurs which is interpreted as a change in shape to a prolate deformation, Band-mixing calculations are performed for Ir171-175. These show that shape-coexistence between triaxial and prolate states in these nuclei follows the same systematics found in their Pt and Os neighbours. The systematics are also compared with deformations calculated for Ir171-179 using the code "Ultimate Cranker". Dipole bands were also observed, but tilted axis cranking calculations suggest that they are associated with a collective rotation.

  • 9.
    Bergenwall, B.
    et al.
    Department of Radiation Sciences, Uppsala University, Box 535, S-751 21 Uppsala, Sweden.
    Ataç, Ayşe
    Department of Radiation Sciences, Uppsala University, Box 535, S-751 21 Uppsala, Sweden, Department of Physics, Ankara University, 06100 Tandogan Ankara, Turkey.
    Kullander, S.
    Department of Radiation Sciences, Uppsala University, Box 535, S-751 21 Uppsala, Sweden.
    Neutron-induced light charged particle production in carbon at 96 MeV2005In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 747, no 2-4, p. 152-181Article in journal (Refereed)
    Abstract [en]

    Differential cross sections of charged particle production, i.e., p, d, t, 3He-ions and α-particles, in 96 MeV neutron-carbon interactions have been measured at laboratory angles in the range 20° to 160° in steps of 20°. The experimental techniques are described as well as the procedures for acquisition, analysis, reduction and correction of the data. Results including double differential, energy-differential, angle-differential and total particle production cross sections are reported and constitute the first data set with five ejectiles at such a high neutron energy. Thanks to the low-energy thresholds, 50% of the production cross section of α-particles, and 85% of the production cross sections of protons and deuterons, could be measured. For α-particles, the measured fraction is much higher than what has been achieved earlier at lower energies. The results on the hydrogen isotopes agree fairly well with a previous measurement at 95 MeV and with recent GNASH calculations. For the helium isotopes, however, there are important discrepancies in spectral shape and magnitude between the new results and the model calculations.

  • 10.
    Bold, Tomasz
    et al.
    AGH Univ Sci & Technol, Krakow, Poland..
    Bold, T.
    AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Krakow, Poland..
    Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Ohm, Christian
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Ripellino, Giulia
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Zwalinski, L.
    CERN, Geneva, Switzerland..
    Measurement of the azimuthal anisotropy of charged particles in 5.02 TeV Pb+Pb and 5.44 TeV Xe+Xe collisions with ATLAS2019In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 391-394Article in journal (Refereed)
    Abstract [en]

    The data collected by the ATLAS experiment during the 2015 Pb+Pb and 2017 Xe+Xe LHC runs offer new opportunities to study charged particle azimuthal anisotropy. The high-statistics Pb+Pb sample allows for a detailed study of the azimuthal anisotropy of produced particles. This should improve the understanding of initial conditions of nuclear collisions, hydrodynamical behavior of quark-gluon plasma and parton energy loss. New ATLAS measurements of differential and global Fourier harmonics of charged particles (v(n)) in 5.02 TeV Pb+Pb and 5.44 TeV Xe+Xe collisions in a wide range of transverse momenta, pseudorapidity (vertical bar eta vertical bar < 2.5) and collision centrality are presented. The higher order harmonics, sensitive to fluctuations in the initial state, are measured up to n = 7 using the two-particle correlation, cumulant and scalar product methods. The dynamic properties of QGP are studied using a recently-proposed modified Pearson's correlation coefficient, rho(v(n)(2), p(T)), between the event-wise mean transverse momentum and the magnitude of the flow vector in 5.02 TeV Pb+Pb and p+Pb collisions. Several important observations are made. The elliptic and triangular flow harmonics show an interesting universal p(T)-scaling. A linear correlation between the v(2) and v(3) coefficients at low and high p(T) ranges is observed and quantified. The correlation coefficient for v(2) is found to be negative in peripheral and positive in central Pb+Pb collisions. The value for v(3) is found to be much smaller than for v(2) and have similar centrality behavior as the v(2).

  • 11. CEDERKALL, J
    et al.
    Cederwall, Bo
    JOHNSON, A
    SEWERYNIAK, D
    NYBERG, J
    NORLIN, LO
    BLOMQVIST, J
    FAHLANDER, C
    WYSS, R
    KEREK, A
    KOWNACKI, J
    ATAC, A
    ADAMIDES, E
    IDEGUCHI, E
    JULIN, R
    JUUTINEN, S
    KARCZMARCZYK, W
    MITARAI, S
    PIIPARINEN, M
    SCHUBART, R
    SLETTEN, G
    TORMANEN, S
    VIRTANEN, A
    1ST OBSERVATION OF EXCITED-STATES IN SB-1081995In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 581, no 1, p. 189-204Article in journal (Refereed)
    Abstract [en]

    A spectroscopic study of Sb-108 has been carried out as a part of a larger experiment where in total twenty-nine different residual nuclei were identified. This study gives the first information on excited levels in this nucleus. A low-lying two-quasi-particle multiplet together with some of the higher lying levels are discussed within the framework of the nuclear shell model. A rotational, strongly coupled, band is identified as, most likely, being built on the deformed pig9/2(-1) nuh11/2 configuration in accordance with total routhian surface calculations. Tentative spins and parities are presented as well as B(M1)/B(E2) ratios for some of the transitions in the strongly coupled band.

  • 12. Cederwall, Bo
    et al.
    JOHNSON, A
    WYSS, R
    LINDEN, CG
    MITARAI, S
    MUKAI, J
    FANT, B
    JUUTINEN, S
    AHONEN, P
    NYBERG, J
    HIGH-SPIN STATES IN BA-121 AND DEFORMATION-DEPENDENT ALIGNMENTS1991In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 529, no 2, p. 410-428Article in journal (Refereed)
    Abstract [en]

    The high-spin structure of 121Ba has been investigated by in-beam gamma-ray spectroscopic techniques. Rotational bands based on the h11/2, g7/2 and tentatively d5/2 quasineutron configurations have been established. The alignments of h11/2 protons and neutrons are identified at HBAR-omega-c = 0.35-0.40 MeV in the h11/2 and g7/2 bands whereas an alignment occurs at HBAR-omega-c = 0.29 MeV in the (tentatively) d5/2 band. B(M1)/B(E2) ratios were extracted and contributed to the configuration assignments. The results are interpreted within the cranked mean-field approach.

  • 13. Cederwall, Bo
    et al.
    LIDEN, F
    JOHNSON, A
    HILDINGSSON, L
    WYSS, R
    FANT, B
    JUUTINEN, S
    AHONEN, P
    MITARAI, S
    MUKAI, J
    NYBERG, J
    RAGNARSSON, I
    SEMMES, PB
    SIGNATURE INVERSION IN CS-120 - EVIDENCE FOR A RESIDUAL PN INTERACTION1992In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 542, no 3, p. 454-478Article in journal (Refereed)
    Abstract [en]

    High-spin states have been observed in the odd-odd isotope 120Cs in S-32-induced reactions. The previously known band is extended to higher spin and several new bands are identified. Band-head configurations have been inferred by comparing the band properties with known bands in the odd nuclei 121Cs and 121Ba. A remarkable signature inversion is observed in the pi-h11/2 x nu-h11/2 band. The experimental data are compared with calculations made within the total routhian surface model and the two-particle plus triaxial rotor model. It is concluded that a significant residual pn interaction rather than triaxiality is responsible for the signature inversion phenomenon in the pi-h11/2 x nu-h11/2 band of 120Cs.(~)[GRAPHICS]

  • 14.
    Changizi, Sara A.
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Empirical pairing gaps, shell effects, and di-neutron spatial correlation in neutron-rich nuclei2015In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 940, p. 210-226Article in journal (Refereed)
    Abstract [en]

    The empirical pairing gaps derived from four different odd-even mass staggering formulas are compared. By performing single-j shell and multi-shell seniority model calculations as well as by using the standard HFB approach with Skyrme force we show that the simplest three-point formula δC(3)(N)=12[B(N,Z)+B(N-2,Z)-2B(N-1,Z)] can provide a good measure of the neutron pairing gap in even-N nuclei. It removes to a large extent the contribution from the nuclear mean field as well as contributions from shell structure details. It is also less contaminated by the Wigner effect for nuclei around N=Z. We also show that the strength of δC(3)(N) can serve as a good indication of the two-particle spatial correlation in the nucleus of concern and that the weakening of δC(3)(N) in some neutron-rich nuclei indicates that the di-neutron correlation itself is weak in these nuclei.

  • 15.
    Changizi, Sara A.
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Odd-even staggering in neutron drip line nuclei2016In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 951, p. 97-115Article in journal (Refereed)
    Abstract [en]

    We have done systematic Hartree-Fock-Bogoliubov calculations in coordinate space on the one-quasi-particle energies and binding energy odd-even staggering (OES) in semi-magic nuclei with the zero-range volume, mixed and surface pairing forces in order to explore the influence of their density dependence. The odd-N isotopes are calculated within the blocking scheme. The strengths for the pairing forces are determined in two schemes by fitting locally to reproduce pairing gap in 120Sn and globally to all available data on the OES of semi-magic nuclei with Z≥8. In the former calculations, there is a noticeable difference between the neutron mean gaps in neutron-rich O, Ca, Ni and Sn isotopes calculated with the surface pairing and those with the mixed and volume pairing. The difference gets much smaller if the globally optimized pairing strengths are employed. The heavier Pb isotopes show the opposite trend. Moreover, large differences between the mean gap and the OES may be expected in both calculations when one goes towards the neutron drip line.

  • 16.
    Citron, Zvi
    et al.
    Ben Gurion Univ Negev, Beer Sheva, Israel..
    Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Ohm, Christian
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ripellino, Giulia
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Zwalinski, L.
    CERN, Geneva, Switzerland..
    Electroweak probes of small and large systems with the ATLAS detector2019In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 603-606Article in journal (Refereed)
    Abstract [en]

    Measurements of isolated prompt photon and massive electroweak (W and Z) boson production in different collision systems are of great interest to understand the partonic structure of heavy nuclei, and serve as a constraint on the initial state in larger collision systems. These channels are sensitive to a variety of effects such as the modification of the parton densities in nuclei in certain kinematic regions, and the energy loss of partons as they undergo multiple interactions in the nucleus before the hard parton-parton scattering. High-statistics samples of lead-lead and proton-lead collision data at root s(NN)=5.02 TeV and 8.16 TeV, respectively, taken by the ATLAS experiment at the LHC, as well as proton-proton comparison data at analogous collision energies, allow for a detailed study of these phenomena in data and comprehensive comparisons to the predictions of a variety of theoretical approaches. This paper presents the latest ATLAS results in these topics, including updated results on inclusive prompt photon production in proton-lead collisions over a broad kinematic range and high-precision W boson results in lead lead collisions.

  • 17.
    Derendarz, Dominik
    et al.
    PAS, Inst Nucl Phys, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Derendarz, D.
    Polish Acad Sci, Inst Nucl Phys, Krakow, Poland..
    Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ohm, Christian
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ripellino, Giulia
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Zwalinski, L.
    CERN, Geneva, Switzerland..
    Measurement of the flow harmonic correlations in pp, p plus Pb and low multiplicity Pb plus Pb collisions with the ATLAS detector at the LHC2019In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 479-482Article in journal (Refereed)
    Abstract [en]

    Recent measurements of the correlations between flow harmonics obtained using four-particle symmetric cumulants and three-particle asymmetric cumulants with the ATLAS detector at the LHC are described. The data sets of pp, p+Pb and peripheral Pb+Pb collisions at various energies are analyzed, aiming to probe the long-range collective nature of multi-particle production in small systems. The sensitivity of the standard cumulant method to non-flow correlations is investigated by introducing the subevents method. A systematic reduction of non-flow effects is observed when using the two-subevent method. Further reduction is observed with the three-subevent method that is consistent with the results obtained with the four-subevent one. A negative correlation between v(2) and v(3) and a positive correlation between v(2) and v(4), for all studied collision systems and over full multiplicity range, is observed. The correlation strength computed as symmetric cumulants normalized by the < v(n)(2)> is similar for all collision systems and weakly depends on multiplicity. These measurements provide new evidence for long-range multi-particle collectivity in small collision systems and quantify the nature of its event-by-event fluctuations.

  • 18. Dussel, G. G.
    et al.
    Betan, R. Id
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics.
    Vertse, T.
    One- and two-quasiparticle states in the complex energy plane2007In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 789, p. 182-200Article in journal (Refereed)
    Abstract [en]

    One- and two-quasi particle states are studied in the complex energy plane. It is found that the pairing interaction does not change the character of the complex state. If a normal state is a physically meaningful resonance, then it will remain as such throughout the shell and if it is unphysical it will also remain as such throughout the shell. An important consequence of this is that it justifies the use of bound representations to evaluate many-body systems within the shell-model in cases where the single-particle states are narrow resonances. The character of two-quasiparticle states may oscillate between meaningful resonances and unphysical complex excitations as the number of particles increases.

  • 19. FAHLANDER, C
    et al.
    SEWERYNIAK, D
    NYBERG, J
    DOMBRADI, Z
    PEREZ, GE
    JOZSA, M
    NYAKO, BM
    ATAC, A
    Cederwall, Bo
    JOHNSON, A
    KEREK, A
    KOWNACKI, J
    NORLIN, LO
    WYSS, R
    ADAMIDES, E
    IDEGUCHI, E
    JULIN, R
    JUUTINEN, S
    KARCZMARCZYK, W
    MITARAI, S
    PIIPARINEN, M
    SCHUBART, R
    SLETTEN, G
    TORMANEN, S
    VIRTANEN, A
    IN-BEAM SPECTROSCOPY OF TE-1101994In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 577, no 3-4, p. 773-785Article in journal (Refereed)
    Abstract [en]

    The neutron-deficient nucleus Te-110 has been investigated by in-beam spectroscopic methods using the NORDBALL multi-detector array. Except for the energy of one level observed in alpha-decay, excited states in Te-110 were previously unknown. The level scheme constructed from gamma gamma-coincidence relationships is presented with tentative spin assignments up to I-pi = 21(-). Above spin 8(+) the yrast states have negative parity. They are most likely the members of a band predominantly based on the nu(h(11/2)g(7/2)) two-quasiparticle configuration. A band crossing is observed at I-pi approximate to 17(-). It is suggested to be caused by the alignment of two h(11/2) neutrons. The cranked shell model correctly predicts the spin alignment, but fails to reproduce the observed band crossing frequency, possibly because of octupole effects.

  • 20.
    Grabowska-Bold, Iwona
    et al.
    AGH Univ Sci & Technol, Krakow, Poland..
    Grabowska-Bold, I
    AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Krakow, Poland..
    Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ohm, Christian
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ripellino, Giulia
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Zwalinski, L.
    CERN, Geneva, Switzerland..
    Highlights from the ATLAS experiment2019In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 8-14Article in journal (Refereed)
    Abstract [en]

    This report provides an overview of the new results obtained by the ATLAS Collaboration at the LHC, which were presented at the Quark Matter 2018 conference. These measurements were covered in 12 parallel talks, one flash talk and 11 posters. In this document, a discussion of results is grouped into four areas: electromagnetic interactions, jet quenching, quarkonia and heavy-flavour production, and collectivity in small and larger systems. Measurements from the xenon-xenon collisions based on a short run collected in October 2017 are reported for the first time.

  • 21.
    Gudowski, Waclaw
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
    Nuclear waste management. Status, prospects and hopes2005In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 752, no 1-4, p. 623C-632CArticle in journal (Refereed)
  • 22.
    Gudowski, Waclaw
    KTH, Superseded Departments, Physics.
    Transmutation of nuclear waste2000In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 663, p. 169C-182CArticle in journal (Refereed)
  • 23. Henriksson, Krister O. E.
    et al.
    Lahde, T. A.
    Nyfalt, C. J.
    Riska, C. O.
    Pion decay widths of D mesons2001In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 686, p. 355-378Article in journal (Refereed)
    Abstract [en]

    The pionic decay rates of the excited L = 0, 1 D mesons are calculated with a Hamiltonian model within the Framework of the covariant Blankenbecler-Sugar equation. The interaction between the light quark and charm antiquark is described by a linear scalar confining and a screened one-gluon exchange interaction. The decay widths of the D* mesons obtain a contribution from the exchange current that is associated with the linear scalar confining interaction. If this contribution is taken into account along with the single-quark approximation, the calculated decay rates of the charged D* mesons are readily below the current empirical upper limits if the axial coupling constant of the light constituent quarks is taken to be g(A)(q) = 0.87, but reach the empirical upper limits if g(A)(q) = 1. With the conventional values for g(A)(q), the calculated widths of the D-1 and D-2* mesons fall somewhat below the experimental lower limits, leaving room for other decay modes as well, such as pi pi decay. The unrealistically large contribution from the axial charge operator to the calculated pion decay width of the D-1 meson is suppressed by taking into account the exchange charge effects that are associated with the scalar linear confining and vector one-gluon exchange interactions. The predicted values for the pionic widths uf the hitherto undiscovered L = 1 D-1* and D-0* mesons are found to be smaller than previous estimates.

  • 24. HILDINGSSON, L
    et al.
    KLAMRA, W
    LINDBLAD, T
    LINDEN, CG
    Cederwall, Bo
    SATULA, W
    WYSS, R
    KALFAS, C
    KOSSIONIDES, S
    PAPADOPOULOS, CT
    VLASTOU, R
    GIZON, J
    CLARKE, D
    KHAZAIE, F
    LISLE, JC
    MO, JN
    HIGH-SPIN PHENOMENA IN OS-1741992In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 545, no 4, p. 871-888Article in journal (Refereed)
    Abstract [en]

    High-spin states of 174Os have been investigated by means of the (Nd(S, 4n)Os)-Nd-146-S-32-Os-174 reaction using the ESSA30 multidetector system. The decay is dominated by the ground-state positive-parity band, two negative-parity 4- and 5- bands and another band starting at spin 9. Deformed shell-model calculations have been carried out to interpret the observed band structures. The role of the strongly shape-driving, non-aligned, pi-h9/2 configuration in the low-spin region of the ground-state band is discussed. The first band crossing is interpreted as due to the nu-i13/2 alignment. The two lowest side-bands are understood in terms of coupling to octupole excitations.

  • 25.
    Hu, Qipeng
    et al.
    Brookhaven Natl Lab, Upton, NY 11973 USA..
    Hu, Q.
    Brookhaven Natl Lab, Phys Dept, Upton, NY USA..
    Lund-Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ohm, Christian
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ripellino, Giulia
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Zwalinski, L.
    CERN, Geneva, Switzerland..
    Measurement of heavy flavor production and azimuthal anisotropy in small and large systems with ATLAS2019In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 687-690Article in journal (Refereed)
    Abstract [en]

    Heavy-flavor hadron production and collective motion in A+A collisions provide insight into the energy loss mechanism and transport properties of heavy quarks in the QGP. The same measurements in p+A collisions serve as an important baseline for understanding the observations in A+A collisions. For example, detailed studies of heavy-flavor hadron azimuthal anisotropy in p+A collisions may help to address whether the observed long-range "ridge" correlation arises from hard or semi-hard processes, or if it is the result of mechanisms unrelated to the initial hardness scale. These proceedings summarize heavy-flavor hadron production, via their semi-leptonic decay to muons in 2.76 TeV Pb+Pb and pp collisions, non-prompt J/psi in 5.02 TeV Pb+Pb and pp collisions, and prompt D-0 mesons in 8.16 TeV p+Pb collisions using ATLAS detector at the LHC. Azimuthal anisotropy of heavy-flavor hadrons is studied via their decay muons in 2.76 TeV Pb+Pb and 8.16 TeV p+Pb collisions, and via non-prompt J/psi in 5.02 TeV Pb+Pb collisions. Strong suppression of heavy-flavor hadron production and azimuthal anisotropy are observed in Pb+Pb collisions, while significant azimuthal anisotropy of heavy-flavor muons is observed in p+Pb collisions, without evidence of the modification of their production rates.

  • 26. Huber, S. J.
    et al.
    Konstandin, Thomas
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Prokopec, T.
    Schmidt, M. G.
    Baryogenesis in the MSSM, nMSSM and NMSSM2007In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 785, no 1-2, p. 206C-209CArticle in journal (Refereed)
  • 27. JERRESTAM, D
    et al.
    Cederwall, Bo
    FOGELBERG, B
    GIZON, A
    GIZON, J
    HILDINGSSON, L
    IDEGUCHI, E
    KLAMRA, W
    KOWNACKI, J
    LIDEN, F
    LINDBLAD, T
    MITARAI, S
    NYBERG, J
    COLLECTIVE EXCITATIONS IN CD-1061994In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 571, no 2, p. 393-412Article in journal (Refereed)
    Abstract [en]

    High Spin states in 106Cd were populated by the reactions Zr-94(O-17, 5n) and Ge(S-32, 4n) at 80 MeV and at 148 MeV, respectively. The gamma-decay was studied by gamma-spectroscopic methods using the Nordball multi-detector army. Protons and alpha-particles were detected in particle detector system, thus selecting the neutron channel. The experiment included gamma-ray yields, gammagamma-coincidences and gamma-ray angular relation measurements. Collective bands extending up to spin 26+, 20- and 21-, have been observed in 106Cd. A new lifetime Of 11(-3)+6 ns for the 16+ state at 7118.7 keV has been found. Both total Routhian surfaces and spin diabatic surfaces have been calculated and used for assigning quasiparticle configurations to the bands. The (+, 0) band is assigned as a nuh11/2(2) configuration below I = 16+ and at higher spins suggested to be built on a pig9/2(2)nuh11/2(2) configuration. The large hindrance observed for the decay from the 16+ state supports the latter assignment. With the alignment of the nuh11/12(2) pair the deformation is predicted to change from (epsilon2,gamma) = (0.13,-2-degrees) to (0.17, 4-degrees). The configuration of the negative parity bands is assigned as either a nuh11/2(1)d5/2(1) or a nuh11/2(1)(g7/2xd5/2)1, With (epsilon2, gamma) = (0.14,9-degrees.

  • 28. Jia, J Y
    et al.
    Kastanas, Konstatinos A.
    KTH, School of Engineering Sciences (SCI), Physics.
    Lund-Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ripellino, Giulia
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Zwalinski, L.
    et al.,
    Heavy Ion Results from ATLAS2017In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 967, p. 51-58Article in journal (Refereed)
    Abstract [en]

    These proceedings provide an overview of the new results obtained with the ATLAS detector at the LHC, which were presented in the Quark Matter 2017 conference. These results were covered by twelve parallel talks, one flash talk and eleven posters. These proceedings group these results into five areas: initial state, jet quenching, quarkonium production, longitudinal flow dynamics, and collectivity in small systems.

  • 29. Jonsson, K
    et al.
    Cederwall, Bo
    Johnson, A
    Wyss, R
    Bäck, Torbjörn
    Cederkall, J
    Devlin, M
    Elson, J
    LaFosse, D R
    Lerma, F
    Sarantites, D G
    Clark, R M
    Lee, I Y
    Macchiavelli, A O
    Macleod, R W
    Collective excitations and band termination in Nb-851999In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 645, no 1, p. 47-60Article in journal (Refereed)
    Abstract [en]

    High-spin states in Nb-85 were studied using the GAMMASPHERE Ge detector array and the MICROBALL charged-particle detector system. Three gamma-ray cascades with collective rotational characteristics were observed. One of the bands exhibits a forking at the top, most likely reflecting the termination of one branch into a favoured non-collective, near spherical state. The data are interpreted in terms of cranked Strutinsky-type calculations.

  • 30. Joss, D. T.
    et al.
    King, S. L.
    Page, R. D.
    Simpson, J.
    Keenan, A.
    Amzal, N.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics.
    Bentley, M. A.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Cocks, J. F. C.
    Cullen, D. M.
    Greenlees, P. T.
    Helariutta, K.
    Jones, P. M.
    Julin, R.
    Juutinen, S.
    Kankaanpaa, H.
    Kettunen, H.
    Kuusiniemi, P.
    Leino, M.
    Muikku, M.
    Savelius, A.
    Uusitalo, J.
    Williams, S. J.
    Identification of excited states in Os-167 and Os-168: shape coexistence at extreme neutron deficiency2001In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 689, no 04-mar, p. 631-654Article in journal (Refereed)
    Abstract [en]

    Excited states in the very neutron-deficient isotopes Os-167 and Os-168 have been observed using the reaction Sn-112(Ni-58, 2pxn). The JUROSPHERE gamma -ray spectrometer array was used in conjunction with the RITU gas-filled recoil separator to collect prompt gamma radiation in coincidence with recoils implanted in a silicon strip detector located at the focal plane of RITU. Using a selective recoil decay tagging technique it has been possible to unambiguously assign gamma -ray transitions to Os-167 and Os-168 through the characteristic a radioactivity of these nuclides. The high-spin structure of the bands is discussed in terms of quasiparticle configurations within the framework of the cranked shell model. The role of shape coexistence in Os-168 is examined with phenomenological three-band mixing calculations.

  • 31. JUTTINEN, S
    et al.
    JULIN, R
    PIIPARINEN, M
    AHONEN, P
    Cederwall, Bo
    FAHLANDER, C
    LAMPINEN, A
    LONNROTH, T
    MAJ, A
    MITARAI, S
    MULLER, D
    NYBERG, J
    SIMECEK, P
    SUGAWARA, M
    THORSLUND, I
    TORMANEN, S
    VIRTANEN, A
    WYSS, R
    GAMMA-RAY SPECTROSCOPY OF CD-1101994In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 573, no 2, p. 306-332Article in journal (Refereed)
    Abstract [en]

    The nucleus Cd-110 has been studied using the C-13 and O-18 induced reactions and the NORDBALL multi-detector array. The yrast band was observed to I(pi) = 28+ and a large number of side bands were identified. The h11/2 neutrons were found to play a dominant role in the observed rotational structures. The weakly populated yrast 3187 keV 8+ state is interpreted as arising from the proton g9/2(-2) configuration. Collective bands, where the band members are connected by DELTAI = 1 transitions and where the DELTAI = 2 transitions are not observed, are also reported. These bands are interpreted to have prolate configurations involving both the h11/2 neutrons and the g9/2 protons. The experimental data are discussed in terms of the total routhian surface and cranked shell model calculations.

  • 32. Juutinen, S
    et al.
    Makela, E
    Julin, R
    Piiparinen, M
    Tormanen, S
    Virtanen, A
    Adamides, E
    Atac, A
    Blomqvist, J
    Cederwall, Bo
    Fahlander, C
    Ideguchi, E
    Johnson, A
    Karczmarczyk, W
    Kownacki, J
    Mitarai, S
    Norlin, L O
    Nyberg, J
    Schubart, R
    Seweryniak, D
    Sletten, G
    Coexistence of collective and quasiparticle structures in Sn-106 and Sn-1081997In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 617, no 1, p. 74-90Article in journal (Refereed)
    Abstract [en]

    New levels in the neutron deficient nuclei Sn-106 and Sn-108 have been investigated by using the NORDBALL detector array combined with charged particle and neutron detectors. The excited structures are discussed in terms of collectivity and the shell model. The excitations are interpreted to be based on d5/2, g7/2 and h(11/2) both for protons and neutrons and g(9/2) for protons. The systematical behaviour of the specific states in the Sn isotopes is studied in the mass range of A = 106-118.

  • 33. JUUTINEN, S
    et al.
    TORMANEN, S
    AHONEN, P
    Cederwall, Bo
    FANT, B
    JOHNSON, A
    JULIN, R
    MITARAI, S
    MUKAI, J
    NYBERG, J
    PIIPARINEN, M
    VIRTANEN, A
    WYSS, R
    COMPETING PROTON AND NEUTRON ALIGNMENTS IN XE-117-1201993In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 553, p. C531-C534Article in journal (Refereed)
  • 34. Kownacki, J
    et al.
    Lipoglavsek, M
    Norlin, L O
    Nyberg, J
    Seweryniak, D
    Cederkall, J
    Palacz, M
    Persson, J
    Atac, A
    Cederwall, Bo
    Fahlander, C
    Grawe, H
    Johnson, A
    Kerek, A
    Klamra, W
    Karny, M
    Liden, F
    Likar, A
    Schubart, R
    Wyss, R
    Adamides, E
    de Angelis, G
    Bednarczyk, P
    Dombradi, Z
    Foltescu, D
    Gorska, M
    Ideguchi, E
    Jerrestam, D
    Julin, R
    Juutinen, S
    Mitarai, S
    Makela, E
    Perez, G
    Piiparinen, M
    de Poli, M
    Roth, H A
    Shizuma, T
    Skeppstedt, J
    Sletten, G
    Tormanen, S
    Vass, T
    Virtanen, A
    High-spin studies of the neutron deficient nuclei In-103, In-105, In-107, and In-1091997In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 627, no 2, p. 239-258Article in journal (Refereed)
    Abstract [en]

    High-spin states of the isotopes In-103,In-105,In-107,In-109 have been investigated using in-beam gamma-ray spectroscopic methods. Results from three different experiments are presented. Targets of Fe-54, Cr-50, and Mo-92 were bombarded by a 270 and 261 MeV Ni-58 beam and by a 95 MeV F-19 beam, respectively. Reaction channel separation was achieved with a charged-particle detector array and in the first two experiments also with a 1 pi neutron detector system. As a result of these experiments the level schemes of In-103,In-105,In-107,In-109 were significantly extended. Excited states of these odd-A indium isotopes are discussed within the framework of the nuclear shell model and the hole-core coupling scheme. The systematics of excited states of light odd-A indium isotopes is also discussed. (C) 1997 Elsevier Science B.V.

  • 35. LIDEN, F
    et al.
    CEDERWALL, Bo
    AHONEN, P
    BANES, DW
    FANT, B
    GASCON, J
    HILDINGSSON, L
    JOHNSON, A
    JUUTINEN, S
    KIRWAN, A
    LOVE, DJG
    MITARAI, S
    MUKAI, J
    NELSON, AH
    NYBERG, J
    SIMPSON, J
    WYSS, R
    ALIGNMENT PROCESSES IN CS-119, CS-121 AND CS-1231992In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 550, no 2, p. 365-390Article in journal (Refereed)
    Abstract [en]

    Rotational band structures have been observed in the odd-A Cs isotopes 119Cs, 121Cs and 123Cs. The previously known bands have been extended to higher spin values and several new bands have been established. Alignments of both h11/2 protons and neutrons are seen. Of special interest are the alignment frequencies in the (tentative) [422]3/2+ and [404]9/2+ bands which indicate a configuration-dependent proton pairing. Furthermore, the variation of the interaction strength at the first band crossing in the h11/2 bands does not follow the standard cranked-shell-model predictions. This feature is in line with previous systematic observations of alignment processes in high-j intruder bands, and might infer an additional band mixing due to a neutron-proton interaction.(~)[GRAPHICS]

  • 36. Lieder, R. M.
    et al.
    Gast, W.
    Jager, H. M.
    Mihailescu, L.
    Enqvist, T.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    et al,
    The TMR network project Development of gamma-ray tracking detectors2001In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 682, p. 279C-285CArticle in journal (Refereed)
    Abstract [en]

    The next generation of 4 pi arrays for high-precision gamma -ray spectroscopy will involve gamma -ray tracking detectors. They consist of high-fold segmented Ge detectors and a front-end electronics, based on new digital signal processing techniques, which allows to extract energy, timing and spatial information for a gamma -ray by pulse shape analysis of the Ge detector signals. Utilizing the information on the positions of the interaction points and the energies released at each point the tracks of the gamma -rays in a Ge shell can be reconstructed in three dimensions.

  • 37. Lieder, R. M.
    et al.
    Rzaca-Urban, T.
    Jensen, H. J.
    Gast, W.
    Georgiev, A.
    Jager, H. M.
    van der Meer, E.
    Droste, C.
    Morek, T.
    Bazzacco, D.
    Lunardi, S.
    Menegazzo, R.
    Petrache, C. M.
    Alvarez, C. R.
    Ur, C. A.
    de Angelis, G.
    Napoli, D. R.
    Venkova, T.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    From highly to superdeformed shapes: study of Gd-1432000In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 671, no 04-jan, p. 52-70Article in journal (Refereed)
    Abstract [en]

    A superdeformed band has been discovered in Gd-143 consisting Of 15 transitions. It does not show the band crossing observed in the neighbouring heavier Gd isotopes and it is degenerate with the superdeformed band in Eu-143. In contrast to other degenerate bands at superdeformed shape, the configurations of the bands are quite different here. They result from the exchange of a nu 6(4) with a pi[404]9/2 configuration. In addition, a collective band has been observed which adopts a well-deformed triaxial shape at high spins according to calculations. The transition from highly to superdeformed shapes proceeds via triaxial shapes.

  • 38. Mach, H.
    et al.
    Lewitowicz, M.
    Stanoiu, M.
    Becker, F.
    Blomqvist, J.
    Borge, M. J. G.
    Boutami, R.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Dlouhy, Z.
    Fogelberg, B.
    Fraile, L. M.
    Georgiev, G.
    Grawe, H.
    Grzywacz, R.
    Johansson, P. L.
    Klamra, Wlodzimierz
    KTH, Superseded Departments, Physics.
    Lukyanov, S.
    Mineva, M.
    Mrazek, J.
    Neyens, G.
    Santos, F. D.
    Pfutzner, M.
    Penionzhkevich, Y. E.
    Ramstrom, E.
    Sawicka, M.
    Coupling of valence particles/holes to Ni-68,Ni-70 studied via measurements of the B(E2) strength in Ni-67,Ni-69,Ni-70 and Cu-712003In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 719, p. 213C-216CArticle in journal (Refereed)
  • 39. Palacz, M
    et al.
    Seweryniak, D
    Atac, A
    Blomqvist, J
    CEDERWALL, BO
    KTH, Superseded Departments, Physics.
    Fahlander, C
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Kerek, Andreas
    KTH, Superseded Departments, Physics.
    Kownacki, J
    Norlin, L O
    Nyberg, J
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Ideguchi, E
    Julin, R
    Juutinen, S
    Mitarai, S
    Piiparinen, M
    Sletten, G
    Tormanen, S
    Virtanen, A
    In-beam gamma-ray spectroscopy of Co-561997In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 627, no 1, p. 162-174Article in journal (Refereed)
    Abstract [en]

    Excited states of Co-56 were studied in the reaction Al-27(S-32,2p1n) Co-56. The NORDBALL array with a Neutron Wall and a Silicon Ball was employed. The excited states were interpreted in terms of particle-hole excitations with respect to the doubly magic N = Z = 28 core.

  • 40.
    Perepelitsa, Dennis, V
    et al.
    Univ Colorado, Boulder, CO 80309 USA..
    Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Ohm, Christian
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Perepelitsa, D. , V
    Ripellino, Giulia
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Zwalinski, L.
    CERN, Geneva, Switzerland..
    Photon-tagged measurements of jet quenching with ATLAS2019In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 595-598Article in journal (Refereed)
    Abstract [en]

    Events containing a high transverse momentum (p(T)) prompt photon offer a useful way to study the dynamics of the hot, dense medium produced in heavy ion collisions. Because photons do not carry color charge, they are unaffected by the medium, and thus provide information about the momentum, direction, and flavor (quark or gluon) of the associated hard-scattered parton before it begins to shower and become quenched. In particular, the presence of a high-p(T) photon can be used to select pp and Pb+Pb events with the same configuration before quenching, limiting the effects of quenching-induced selection biases present in other jet measurements. The large statistics pp and Pb+Pb data delivered by the LHC in 2015 allow for a detailed study of photon-tagged jet quenching effects, such as the overall parton energy loss and modified structure of the component of the shower which remains correlated with the initial parton direction (e.g. in cone). In this proceeding, photon-tagged measurements of jet quenching by ATLAS are reported.

  • 41. Perez, G. E.
    et al.
    Sohler, D.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Cederkall, J.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Kerek, A.
    Klamra, Wlodzimierz
    KTH, Superseded Departments, Physics.
    Norlin, L. O.
    Nyberg, J.
    et al,
    Structure of high-spin states in Pd-1002001In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 686, p. 41-63Article in journal (Refereed)
    Abstract [en]

    High-spin states of the neutron deficient (100)pd nucleus have been investigated via the Cr-50(Ni-58, 4p alpha) and Zn-70(S-36,6n) heavy-ion induced reactions. For the detection of evaporated particles and gamma rays the NORDBALL array equipped with ancillary detectors and the EUROGAM II detector system were utilized. By the use of in-beam spectroscopic methods 89 transitions belonging to (100)pd have been observed, 49 of which were identified for the first time. The level scheme has been extended up to E-X approximate to 16 MeV excitation energy and I approximate to 25h. The experimental results were compared with the predictions of cranked shell model calculations. Maximal spin alignments were found in the (pig(9/2))(12+)(-4) (vd(5/2),g(7/2)(3)h(11/2))(13-) and (pig(9/2)(-3)p(1/2))(11-)(vd(5/2)g(7/2)(3)h(11/2))(13-) configurations. Possible existence of octupole correlations is discussed on the basis of 6 (E 1)lB(E2) values deduced for the decays of high-spin levels in the yrast negative-parity band.

  • 42.
    Puri, Akshat
    et al.
    Univ Illinois, Champaign, IL 61820 USA..
    Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Ohm, Christian
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Puri, A.
    Univ Illinois, Dept Phys, 1110 W Green St, Urbana, IL 61801 USA..
    Ripellino, Giulia
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Royal Inst Technol, Phys Dept, Stockholm, Sweden..
    Sidebo, P. Edvin
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Strandberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Zwalinski, L.
    CERN, Geneva, Switzerland..
    Measurement of angular and momentum distributions of charged particles within and around jets in Pb plus Pb and pp collisions at root s(NN)=5.02 TeV with ATLAS at the LHC2019In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 177-179Article in journal (Refereed)
    Abstract [en]

    Studies of the fragmentation of jets into charged particles in heavy-ion collisions can help in understanding the mechanism of jet quenching by the hot and dense QCD matter created in such collisions, the quark-gluon plasma. These proceedings present a measurement of the angular distribution of charged particles around the jet axis in root s(NN) = 5.02 TeV Pb+Pb and pp collisions, done using the ATLAS detector at the LHC. The measurement is performed inside jets reconstructed with the anti-k(t) algorithm with radius parameter R = 0.4, and is extended to regions outside the jet cone. Results are presented as a function of Pb+Pb collision centrality, and both jet and charged-particle transverse momenta.

  • 43.
    Qi, Chong
    et al.
    Peking University.
    Xu, F.
    Peking University.
    Isospin asymmetry effects in mirror nuclei with modern charge-dependent NN potential2008In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 814, no 1-4, p. 48-65Article in journal (Refereed)
  • 44.
    Qi, Chong
    et al.
    Peking University.
    Xu, Furong
    Peking University.
    Shell-model study of spectroscopies and isospin structures in odd-odd N=Z nuclei employing realistic NN interaction2008In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 800, no 1-4, p. 47-62Article in journal (Refereed)
    Abstract [en]

    The structures of odd-odd N = Z nuclei in the lower fp shell have been investigated with a new microscopic interaction. The interaction is derived from a high-precision charge-dependent Bonn nucleon-nucleon potential using the folded-diagram renormalization method. Reasonable agreements with experimental data have been obtained. Particularly, the relative positions of T = 0 and T = I bands are well reproduced. As examples, the spectroscopies and isospin structures of (46)V and (50)Mn have been discussed in details, with the useful predictions of level structures including electromagnetic properties. Some unique features in these nuclei can be used to increase the understanding of the effective interaction theory. Our calculations show that the realistic effective interaction which is directly related to nucleon-nucleon scattering can give the reasonable descriptions of the collective properties of nuclear many-body system without any empirical modification.

  • 45.
    Qi, Chong
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Xu, Zhen Xiang
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Liotta, Roberto J.
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Analytic proof of partial conservation of seniority in j=9/2 shells2012In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 884, p. 21-35Article in journal (Refereed)
    Abstract [en]

    A partial conservation of the seniority quantum number in j = 9/2 shells has been found recently in a numerical application. In this paper an analytic proof for this problem is derived as an extension of the work [L. Zamick, P. Van Isacker, Phys. Rev. C 78 (2008) 044327]. We analyze the properties of the non-diagonal interaction matrix elements with the help of the one-particle and two-particle coefficients of fractional parentage (cfp's). It is found that all non-diagonal (and the relevant diagonal) matrix elements can be re-expressed in simple ways and are proportional to certain one-particle cfp's. This remarkable occurrence of partial dynamic symmetry is the consequence of the peculiar property of the j = 9/2 shell, where all it = 3 and 5 states are uniquely defined.

  • 46. Satula, W.
    et al.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    A number projected model with generalized pairing interaction2000In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 676, p. 120-142Article in journal (Refereed)
    Abstract [en]

    A mean-held model with a generalized pairing interaction that accounts for neutron-proton pairing is presented. Both the BCS as well as number-projected solutions of the model are presented. For the latter case the Lipkin-Nogami projection technique was extended to encompass the case of nonseparable proton-neutron systems. The influence of the projection on various pairing phases is discussed. In particular, it is shown that number-projection allows For mixing of different pairing phases but, simultanously, acts destructively on the proton-neutron correlations, The basic implications of proton-neutron pairing correlations on nuclear masses are discussed. It is shown that these correlations may provide a natural microscopic explanation of the Wigner energy lacking in mean-field models. A possible phase transition from isovector to isoscalar pairing condensate at high angular momenta is also discussed. In particular predictions for the dynamical moments of inertia for the superdeformed band in Ru-88 are given.

  • 47. SEWERYNIAK, D
    et al.
    KOWNACKI, J
    NORLIN, LO
    FAHLANDER, C
    ATAC, D
    BLOMQVIST, J
    Cederwall, Bo
    GRAWE, H
    JOHNSON, A
    KEREK, A
    NYBERG, J
    SCHUBART, R
    ADAMIDES, E
    IDEGUCHI, E
    JULIN, R
    JUUTINEN, S
    KARCZMARCZYK, W
    MITARAI, S
    PIIPARINEN, M
    SLETTEN, G
    TORMANEN, S
    VIRTANEN, A
    IN-BEAM STUDY OF IN-102, IN-104 AND IN-1061995In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 589, no 1, p. 175-200Article in journal (Refereed)
    Abstract [en]

    Proton-rich odd-odd In isotopes have been investigated by in-beam spectroscopic methods using the NORDBALL detector array. A Ni-58 beam with an energy of 270 MeV was used to bombard a Fe-54 target. Separation of different reaction channels was achieved with a 4 pi charged-particle multi-detector set-up together with a 1 pi neutron detector wall placed in the forward direction. Excited states of the In-102 nucleus were identified for the first time as well as a set of negative-parity states in In-104. In In-106 the information about positive- and negative-parity states has been extended. The nuclei are discussed within the framework of the nuclear shell model, the interacting boson-fermion-fermion model and the systematics of the heavier odd-odd indium isotopes.

  • 48. Singh, A. K.
    et al.
    Nenoff, N.
    Rossbach, D.
    Gorgen, A.
    Chmel, S.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    et al,
    Detailed study of magnetic rotation in (196)pb2002In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 707, no 02-jan, p. 3-31Article in journal (Refereed)
    Abstract [en]

    High-spin states in Pb-196 have been populated in two different heavy-ion-induced reactions using thin and Au-backed targets, respectively. Gamma-ray coincidences were measured using the EUROBALL spectrometer array. Five new magnetic-rotational bands have been found. The previously known four bands have been extended and some of their levels have been reordered. With one exception, all the bands have been connected to lower-lying states and excitation energies, spins and parities have been determined. From the systematic properties of the bands and from comparison to tilted-axis cranking calculations, arguments for configuration assignments to the bands are derived. It is suggested that the bands are based on proton 11(-) and 8(+) particle states coupled to various neutron-hole excitations.

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    et al.
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    Krusche, B.
    Steinacher, M.
    Walford, N.
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    Wang, C.
    Zhao, J.
    Albrecht, M.
    Erlen, T.
    Fink, M.
    Heinsius, F.
    Held, T.
    Holtmann, T.
    Jasper, S.
    Keshk, I.
    Koch, H.
    Kopf, B.
    Kuhlmann, M.
    Kuemmel, M.
    Leiber, S.
    Mikirtychyants, M.
    Musiol, P.
    Mustafa, A.
    Pelizaeus, M.
    Pychy, J.
    Richter, M.
    Schnier, C.
    Schroeder, T.
    Sowa, C.
    Steinke, M.
    Triffterer, T.
    Wiedner, U.
    Ball, M.
    Beck, R.
    Hammann, C.
    Ketzer, B.
    Kube, M.
    Mahlberg, P.
    Rossbach, M.
    Schmidt, C.
    Schmitz, R.
    Thoma, U.
    Urban, M.
    Walther, D.
    Wendel, C.
    Wilson, A.
    Bianconi, A.
    Bragadireanu, M.
    Caprini, M.
    Pantea, D.
    Patel, B.
    Czyzycki, W.
    Domagala, M.
    Filo, G.
    Jaworowski, J.
    Krawczyk, M.
    Lisowski, E.
    Lisowski, F.
    Michalek, M.
    Poznanski, P.
    Plazek, J.
    Korcyl, K.
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    Szczurek, A.
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    Salabura, P.
    Smyrski, J.
    Strzempek, P.
    Wronska, A.
    Augustin, I.
    Boehm, R.
    Lehmann, I.
    Marinescu, D. Nicmorus
    Schmitt, L.
    Varentsov, V.
    Al-Turany, M.
    Belias, A.
    Deppe, H.
    Dzhygadlo, R.
    Ehret, A.
    Flemming, H.
    Gerhardt, A.
    Goetzen, K.
    Gromliuk, A.
    Gruber, L.
    Karabowicz, R.
    Kliemt, R.
    Krebs, M.
    Kurillan, U.
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    Loechner, S.
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    Orth, H.
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    Peters, K.
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    Schepers, G.
    Schmidt, C. J.
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    Schwiening, J.
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    Batyunya, B. V.
    Davydov, Yu. I.
    Dodokhov, V. Kh.
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    Grigoryan, S.
    Koshurnikov, E. K.
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    Lobanov, Y. Yu.
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    Skachkova, A. N.
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    Zhuravlev, N. I.
    Zorin, A. G.
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    Zhdanov, A.
    Makonyi, K.
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    Tegner, P.
    Wolbing, D.
    Back, Tove
    KTH.
    Cederwall, B.
    Rai, A. K.
    Godre, S.
    Calvo, D.
    Coli, S.
    De Remigis, P.
    Filippi, A.
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    Olave, J.
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    Bussa, M. P.
    Busso, L.
    De Mori, F.
    Destefanis, M.
    Fava, L.
    Ferrero, L.
    Greco, M.
    Hu, J.
    Lavezzi, L.
    Maggiore, M.
    Maniscalco, G.
    Marcello, S.
    Sosio, S.
    Spataro, S.
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    Bradamante, F.
    Bressan, A.
    Martin, A.
    Calen, H.
    Andersson, W. Ikegami
    Johansson, T.
    Kupsc, A.
    Marciniewski, P.
    Papenbrock, M.
    Pettersson, J.
    Schonning, K.
    Wolke, M.
    Galnander, B.
    Diaz, J.
    Chackara, V. Pothodi
    Chlopik, A.
    Kesik, G.
    Melnychuk, D.
    Slowinski, B.
    Trzcinski, A.
    Wojciechowski, M.
    Wronka, S.
    Zwieglinski, B.
    Buehler, P.
    Marton, J.
    Steinschaden, D.
    Suzuki, K.
    Widmann, E.
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    Gerin, Juergen
    Kojouharov, Ivan
    Kojouharova, Jasmina
    Study of doubly strange systems using stored antiprotons2016In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 954, p. 323-340Article in journal (Refereed)
    Abstract [en]

    Bound nuclear systems with two units of strangeness are still poorly known despite their importance for many strong interaction phenomena. Stored antiprotons beams in the GeV range represent an unparalleled factory for various hyperon-antihyperon pairs. Their outstanding large production probability in antiproton collisions will open the floodgates for a series of new studies of systems which contain two or even more units of strangeness at the PANDA experiment at FAIR. For the first time, high resolution gamma-spectroscopy of doubly strange Lambda Lambda-hypernuclei will be performed, thus complementing measurements of ground state decays of Lambda Lambda-hypernuclei at J-PARC or possible decays of particle unstable hypernuclei in heavy ion reactions. High resolution spectroscopy of multistrange Xi(-) -atoms will be feasible and even the production of Omega(-) -atoms will be within reach. The latter might open the door to the vertical bar S vertical bar = 3 world in strangeness nuclear physics, by the study of the hadronic Omega(-) -nucleus interaction. For the first time it will be possible to study the behavior of Xi(+) in nuclear systems under well controlled conditions.

  • 50. Sohler, D.
    et al.
    Cederkäll, Joakim
    KTH, Superseded Departments, Physics.
    Ataç, Ayşe
    Department of Physics, Ankara University, 06100 Tandogan, Ankara, Turkey.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Kerek, Andras
    KTH, Superseded Departments, Physics.
    Klamra, Wlodzimierz
    KTH, Superseded Departments, Physics.
    Norlin, Lars Olov
    KTH, Superseded Departments, Physics.
    Weiszflog, M.
    et, al
    Band-terminating states in Ag-1012004In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 733, no 02-jan, p. 37-52Article in journal (Refereed)
    Abstract [en]

    Excited states of the neutron deficient Ag-101 nucleus have been investigated via the Cr-50(Ni-58, 3rho1alpha) heavy-ion induced reaction at 261 meV by use of in-beam spectroscopic methods. On the basis of the measured gammagamma-cincidence relations and angular distribution ratios high-spin bands have been extended up to I-pi = 35/2(+), 45/2((-)) and (49/2(-)). The negative parity states at the highest energy have been interpreted as terminating non-collective oblate states in the framework of the Nilsson-Strutinsky cranking formalism.

12 1 - 50 of 64
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