Shape coexistence in the very neutron-rich odd-odd {sup 96}Rb

Journal Article · Wed Jun 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.064327· OSTI ID:20698755

Pinston, J A; Genevey, J ^[1]; Orlandi, R ^[2]; Scherillo, A ^[2]; Simpson, G S; Tsekhanovich, I; Faust, H ^[2]; Urban, W ^[3]; Warr, N ^[4]

---

1. Laboratoire de Physique Subatomique et de Cosmologie, IN2P3-Centre National de la Recherche Scientifique/Universite Joseph Fourier, F-38026 Grenoble Cedex (France)
2. Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9 (France)
3. Faculty of Physics, Warsaw University, ul. Hoza 69, PL-00-681 Warsaw (Poland)
4. Institut fuer Kernphysik, Universitaet zu Koeln, Zuelpicherstrasse 77, D-50937 Cologne (Germany)

Microsecond isomers of neutron-rich nuclei in masses A=96 and 98 were reinvestigated at the Institut Laue-Langevin reactor (Grenoble). These nuclei were produced by thermal-neutron induced fission of {sup 241}Pu. The detection is based on the time correlation between fission fragments selected by the Lohengrin mass spectrometer and the {gamma} rays and conversion electrons from the isomers. A new level scheme of {sup 96}Rb is proposed. We have found that the ground state and low-lying levels of this nucleus are rather spherical, and a rotational band develops at 461-keV energy. This band has properties consistent with a {pi}[431 3/2]x{nu}[541 3/2]K=3{sup -} Nilsson assignment and a deformation {beta}{sub 2}>0.28. It is fed by a I{sup {pi}}=10{sup -} microsecond isomer consistent with a {pi}(g{sub 9/2}){nu}(h{sub 11/2}) spherical configuration. It is interesting to note that the same unique-parity states {pi}(g{sub 9/2}) and {nu}(h{sub 11/2}) are present in the same nucleus in a deformed and in a spherical configuration. The neighboring odd-odd nucleus {sup 98}Y presents a strong analogy with {sup 96}Rb and is also discussed.

• OSTI ID: 20698755
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CONVERSION
CORRELATIONS
DEFORMED NUCLEI
ELECTRON SPECTRA
FISSION
FISSION FRAGMENTS
FISSION PRODUCTS
GAMMA RADIATION
GROUND STATES
KEV RANGE
NEUTRON-RICH ISOTOPES
NUCLEAR DEFORMATION
PARITY
PLUTONIUM 241
ROTATIONAL STATES
RUBIDIUM 96
SPHERICAL CONFIGURATION
THERMAL NEUTRONS
YTTRIUM 98