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Publications (4 of 4) Show all publications
Liu, X., Cederwall, B., Qi, C., Wyss, R. A., Aktas, Ö., Ertoprak, A., . . . Zielinska, M. (2021). Evidence for enhanced neutron-proton correlations from the level structure of the N = Z+1 nucleus Tc-87(43)44. Physical Review C: Covering Nuclear Physics, 104(2), Article ID L021302.
Open this publication in new window or tab >>Evidence for enhanced neutron-proton correlations from the level structure of the N = Z+1 nucleus Tc-87(43)44
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2021 (English)In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 104, no 2, article id L021302Article in journal (Refereed) Published
Abstract [en]

The low-lying excited states in the neutron-deficient N = Z + 1 nucleus (87)(43)Tcc(44) have been studied via the fusion-evaporation reaction Fe-54(Ar-36, 2n1p)Tc-87 at the Grand Accelerateur National d'Ions Lourds (GANIL), France. The AGATA spectrometer was used in conjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arrays to measure coincident prompt gamma rays, neutrons, and charged particles emitted in the reaction. A level scheme of Tc-87 from the (9/2(g.s.)(+)) state to the (33/2(1)(+)) state was established based on six mutually coincident gamma-ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at (h) over bar omega approximate to 0.50 MeV. A decrease in alignment frequency and increase in alignment sharpness in the odd-mass isotonic chains around N = 44 is proposed as an effect of the enhanced isoscalar neutron-proton interactions in odd-mass nuclei when approaching the N = Z line.
Place, publisher, year, edition, pages
American Physical Society (APS), 2021
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-300836 (URN)10.1103/PhysRevC.104.L021302 (DOI)000686912200001 ()2-s2.0-85114187751 (Scopus ID)
Note

QC 20210928

Available from: 2021-09-28 Created: 2021-09-28 Last updated: 2024-01-04Bibliographically approved
Petrache, C. M., Wyss, R. A., Back, T., Cederwall, B. & Tucholski, A. (2019). Diversity of shapes and rotations in the gamma-soft Ba-130 nucleus: First observation of a t-band in the A=130 mass region. Physics Letters B, 795, 241-247
Open this publication in new window or tab >>Diversity of shapes and rotations in the gamma-soft Ba-130 nucleus: First observation of a t-band in the A=130 mass region
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2019 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 795, p. 241-247Article in journal (Refereed) Published
Abstract [en]

Several new bands have been identified in Ba-130, among which there is one with band-head spin 8(+). Its properties are in agreement with the Fermi-aligned nu h(11/2)(2)[523]circle times 9/2(-)[514] Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the A = 130 mass region. The t-band is fed by a dipole band involving two additional h(11/2) protons. The odd-spin partners of the proton and neutron S-bands and the ground-state band at high spins are also newly identified. The observed bands are discussed using several theoretical models, total Routhians surfaces (TRS), tilted axis cranking (TAC), particle rotor model (PRM) and projected shell model (PSM), which strongly suggest the coexistence of prolate and oblate shapes polarized by rotation aligned two-proton and two-neutron configurations, as well as prolate collective rotations around axes with different orientations. With the new results, 130 Ba presents one of the best and most complete sets of collective excitations that a gamma-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the A = 130 mass region.
Place, publisher, year, edition, pages
Elsevier BV, 2019
Keywords
Nuclear structure, Collective rotations, Shape coexistence, Particle rotor model, Projected shell model, Tiltid axis cranking
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-256247 (URN)10.1016/j.physletb.2019.06.040 (DOI)000477924000034 ()2-s2.0-85067816517 (Scopus ID)
Note

QC 20220405

Available from: 2019-10-22 Created: 2019-10-22 Last updated: 2024-01-04Bibliographically approved
Singh, B., Erni, W., Krusche, B., Steinacher, M., Walford, N., Liu, B., . . . Kojouharova, J. (2016). Study of doubly strange systems using stored antiprotons. Nuclear Physics A, 954, 323-340
Open this publication in new window or tab >>Study of doubly strange systems using stored antiprotons
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2016 (English)In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 954, p. 323-340Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Strangeness, Hypemuclei, Hyperatoms, Antiprotons
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-193163 (URN)10.1016/j.nuclphysa.2016.05.014 (DOI)000381331200021 ()2-s2.0-84989894263 (Scopus ID)
Note

QC 20161014

Available from: 2016-10-14 Created: 2016-09-30 Last updated: 2024-03-18Bibliographically approved
Hadinia, B., Garrett, P. E., Svensson, C. E., Carroll, R. J., Page, R. D., Joss, D. T., . . . Uusitalo, J. (2013). IN-BEAM gamma-RAY SPECTROSCOPY ABOVE THE HIGH-SPIN ISOMERIC STATE IN Lu-155. In: Garrett, PE Hadinia, B (Ed.), CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS: . Paper presented at Conference: 14th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS)Univ Guelph, Guelph, CANADA AUG 28-SEP 02, 2011 (pp. 139-144). WORLD SCIENTIFIC PUBL CO PTE LTD
Open this publication in new window or tab >>IN-BEAM gamma-RAY SPECTROSCOPY ABOVE THE HIGH-SPIN ISOMERIC STATE IN Lu-155
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2013 (English)In: CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS / [ed] Garrett, PE Hadinia, B, WORLD SCIENTIFIC PUBL CO PTE LTD , 2013, p. 139-144Conference paper, Published paper (Refereed)
Abstract [en]

Excited states in Lu-155 have been studied at the Accelerator Laboratory of the University of Jyvaskyla in Finland. The Lu-155 nuclei were populated using the reaction of Ni-58 on (102)pd at a beam energy of 280 MeV. The nuclei of interest were selected using the RITU gas filled recoil separator and the prompt gamma rays belonging to 155Lu were identified using the recoil-decay tagging technique. The gamma-ray transitions de-exciting the excited states above the high-spin isomeric a-decaying state in Lu-155 have been identified. A gamma-ray coincidence analysis shows that the previously reported level scheme for Lu-155 should be revised.
Place, publisher, year, edition, pages
WORLD SCIENTIFIC PUBL CO PTE LTD, 2013
Keywords
Nuclear structure, gamma spectroscopy
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-245281 (URN)000392645700020 ()
Conference
Conference: 14th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS)Univ Guelph, Guelph, CANADA AUG 28-SEP 02, 2011
Note

QC 20190318

Available from: 2019-03-18 Created: 2019-03-18 Last updated: 2022-06-26Bibliographically approved
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