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  • 201.
    Wyss, Ramon
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Davies, Paul John
    Satula, Wojtek
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wadsworth, Robert
    Contrasting behavior in the rotational structure of the T-z=1/2 nuclei Kr-73 and Rb-75: A possible fingerprint of T=0 neutron-proton pairing correlations2007In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 76, no 1, p. 011301-Article in journal (Refereed)
    Abstract [en]

    Three different rotational bands have been observed to high spin in Rb-75 using Gammasphere. The structures are similar, but not identical to those found in the neighboring T-z=1/2 nucleus Kr-73. Conventional total Routhian surface (TRS) calculations with T=1 pairing are able to reproduce the rotational bands in Rb-75 with extreme accuracy, but they completely fail in reproducing the spectra and decay pattern of the negative parity bands in Kr-73. Simple qualitative arguments are put forward to show that the decay pattern observed in the negative parity bands in Kr-73 can be accounted for by means of T=0 pair correlations. To further corroborate this scenario, deformation, and pairing self-consistent TRS calculations, including schematic T=1 and T=0 pairing, are performed for the first time indicating the onset of dynamical T=0 pair-correlations at high angular momenta.

  • 202. Xu, Chen
    et al.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wang, S. M.
    Xu, F. R.
    Jiang, D. X.
    Molecular structure of highly excited resonant states in Mg-24 and the corresponding Be-8+O-16 and C-12+C-12 decays2010In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 81, no 5, p. 054319-Article in journal (Refereed)
    Abstract [en]

    Exotic Be-8 and C-12 decays from high-lying resonances in Mg-24 are analyzed in terms of a cluster model. The calculated quantities agree well with the corresponding experimental data. It is found that the calculated decay widths are very sensitive to the angular momentum carried by the outgoing cluster. It is shown that this property makes cluster decay a powerful tool to determine the spin as well as the molecular structures of the resonances.

  • 203. Xu, F. R.
    et al.
    Walker, P. M.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Limit to high-spin isomerism in hafnium isotopes2000In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 6201, no 1Article in journal (Refereed)
    Abstract [en]

    Configuration-constrained nuclear shape calculations are used to show that reinforcing neutron and proton orbital structures create exceptional conditions for the formation of multiquasiparticle isomers in neutron-rich hafnium isotopes, with axially symmetric, prolate shapes. Highly excited, long-lived states are predicted. However, at angular momenta close to 40 (h) over bar, orbital alignment effects for collective oblate rotation lend to a deep potential minimum that competes energetically with the prolate multiquasiparticle states.

  • 204. Xu, F. R.
    et al.
    Walker, P. M.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Oblate stability of A approximate to 110 nuclei near the r-process path2002In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 65, no 2Article in journal (Refereed)
    Abstract [en]

    Even-even A approximate to 110 nuclei approaching the astrophysical r-process path have been investigated using both the cranked and the configuration-constrained shell models. The calculations show that, with increasing neutron number in the Zgreater than or equal to40 nuclides, nuclear shapes evolve from prolate, through triaxial to oblate deformations. In contrast to other regions of the nuclear chart, pronounced oblate shapes dominate the collective rotation from ground states to very high spins (Isimilar to40), when Ngreater than or equal to70. The stability of the oblate shapes is due to the simultaneous upper-shell neutron and proton Fermi surfaces, reinforced by the rotation alignment behavior of both nucleon types. Configuration-constrained calculations predict the coexistence of well-deformed prolate and oblate multiquasiparticle (isomeric) states.

  • 205. Yuan, Cenxi
    et al.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Xu, Furong
    Suzuki, Toshio
    Otsuka, Takaharu
    Mirror energy difference and the structure of loosely bound proton-rich nuclei around A=202014In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 89, no 4, p. 044327-Article in journal (Refereed)
    Abstract [en]

    The properties of loosely bound proton-rich nuclei around A = 20 are investigated within the framework of the nuclear shell model. In these nuclei, the strength of the effective interactions involving the loosely bound proton s(1/2) orbit is significantly reduced in comparison with that of those in their mirror nuclei. We evaluate the reduction of the effective interaction by calculating the monopole-based-universal interaction (V-MU) in the Woods-Saxon basis. The shell-model Hamiltonian in the sd shell, such as USD, can thus be modified to reproduce the binding energies and energy levels of the weakly bound proton-rich nuclei around A = 20. The effect of the reduction of the effective interaction on the structure and decay properties of these nuclei is also discussed.

  • 206. Zalewski, M.
    et al.
    Olbratowski, P.
    Rafalski, M.
    Satula, Wojtek
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Werner, T. R.
    Wyss, Ramon A.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Global nuclear structure effects of the tensor interaction2009In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 80, no 6, p. 064307-Article in journal (Refereed)
    Abstract [en]

    A direct fit of the isoscalar spin-orbit (SO) and both isoscalar and isovector tensor coupling constants to the f(5/2)-f(7/2) SO splittings in Ca-40, Ni-56, and Ca-48 nuclei requires a drastic reduction of the isoscalar SO strength and strong attractive tensor coupling constants. The aim of this work is to address further consequences of these strong attractive tensor and weak SO fields on binding energies, nuclear deformability, and high-spin states. In particular, the contribution to the nuclear binding energy from the tensor field shows a generic magic structure with tensorial magic numbers N(Z)=14,32,56, or 90, corresponding to the maximum spin asymmetries in 1d(5/2), 1f(7/2)circle plus 2p(3/2), 1g(9/2)circle plus 2d(5/2), and 1h(11/2)circle plus 2f(7/2) single-particle configurations, respectively, and that these numbers are smeared out by pairing correlations and deformation effects. The consequences of strong attractive tensor fields and weak SO interaction for nuclear stability at the drip lines are also examined, particularly those close to the tensorial doubly magic nuclei. The possibility of an entirely new tensor-force-driven deformation effect is discussed.

  • 207. Zdunczuk, H.
    et al.
    Satula, Wojtek
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Probing the nuclear energy functional at band termination2005In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 71, no 2, p. 024305-Article in journal (Refereed)
    Abstract [en]

    A systematic study of terminating states in the Asimilar to50 mass region using the self-consistent Skyrme-Hartree-Fock model is presented. The objective of this study is to demonstrate that the terminating states, due to their intrinsic simplicity, offer unique and so far unexplored opportunities to study different aspects of the effective NN interaction or nuclear local energy density functional. In particular, we show that the agreement of the calculations to the data depends on the spin fields and the spin-orbit term which, in turn, allows us to constrain the appropriate Landau parameters and the strength of the spin-orbit potential. The present study reveals that the structure and energy of terminating states can be used as a tool to differentiate among the many Skyrme force parametrizations.

  • 208. Zheng, S. J.
    et al.
    Xu, F. R.
    Shen, S. F.
    Liu, H. L.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Yan, Y. P.
    Shape coexistence and triaxiality in nuclei near Zr-802014In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 90, no 6, p. 064309-Article in journal (Refereed)
    Abstract [en]

    Total-Routhian-surface calculations have been performed to investigate the shape evolutions of A similar to 80 nuclei: Zr80-84, Sr76-80, and Mo-84,Mo-86. Shape coexistences of spherical, prolate, and oblate deformations have been found in these nuclei. Particularly for the nuclei Sr-80 and Zr-82, the energy differences between two shape-coexisting states are less than 220 keV. At high spins, the g(9/2) shell plays an important role in shape evolutions. It has been found that the alignment of the g(9/2) quasiparticles drives nuclei to be triaxial.

  • 209. Zheng, Y.
    et al.
    de France, G.
    Clement, E.
    Dijon, A.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wadsworth, R.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Ghazi Moradi, Farnaz
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Jaworski, G.
    Nyako, B. M.
    Nyberg, J.
    Palacz, M.
    Al-Azri, H.
    de Angelis, G.
    Atac, A.
    Aktas, O.
    Bhattacharyya, S.
    Brock, T.
    Davies, P. J.
    Di Nitto, A.
    Dombradi, Zs.
    Gadea, A.
    Gal, J.
    Joshi, P.
    Juhasz, K.
    Julin, R.
    Jungclaus, A.
    Kalinka, G.
    Kownacki, J.
    La Rana, G.
    Lenzi, S. M.
    Molnar, J.
    Moro, R.
    Napoli, D. R.
    Singh, B. S. Nara
    Persson, Andreas
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Recchia, F.
    Sandzelius, Mikael
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Scheurer, J. -N
    Sletten, G.
    Sohler, D.
    Söderstrom, P. -A
    Taylor, M. J.
    Timar, J.
    Valiente-Dobon, J. J.
    Vardaci, E.
    gamma-ray linear polarization measurements and (g(9/2))(-3) neutron alignment in Ru-912013In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 87, no 4, p. 044328-Article in journal (Refereed)
    Abstract [en]

    Linear polarization measurements have been performed for gamma rays in Ru-91 produced with the Ni-58(Ar-36,2p1n gamma)Ru-91 reaction at a beam energy of 111 MeV. The EXOGAM Ge clover array has been used to measure the gamma-gamma coincidences, gamma-ray linear polarization, and gamma-ray angular distributions. The polarization sensitivity of the EXOGAM clover detectors acting as Compton polarimeters has been determined in the energy range 0.3-1.3 MeV. Several transitions have been observed for the first time. Measurements of linear polarization and angular distribution have led to the firm assignments of spin differences and parity of high-spin states in Ru-91. More specifically, calculations using a semiempirical shell model were performed to understand the structures of the first and second (21/2(+)) and (17/2(+)) levels. The results are in good agreement with the experimental data, supporting the interpretation of the nonyrast (21/2(+)) and (17/2(+)) states in terms of the J(max) and J(max) - 2 members of the seniority-three nu(g(9/2))(-3) multiplet.

  • 210.
    Öhrn, A.
    et al.
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    Blomgren, J.
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    Andersson, P.
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    Ataç, Ayşe
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    and, 35 other co-authors
    Elastic scattering of 96 MeV neutrons from iron, yttrium, lead.2008In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 77Article in journal (Refereed)
2345 201 - 210 of 210
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