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Oblate stability of A approximate to 110 nuclei near the r-process path
KTH, Superseded Departments, Physics.
2002 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 65, no 2Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
2002. Vol. 65, no 2
Keyword [en]
even-even, shape coexistence, identical bands, shell-model, mean-field, isotopes, ru-108,ru-110,ru-112, deformation, states, region
URN: urn:nbn:se:kth:diva-21325DOI: 10.1103/PhysRevC.65.021303ISI: 000173888100003OAI: diva2:340023
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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