Oblate-prolate shape competition in Z = 34 to 38 nuclei

Conference · Tue Sep 01 00:00:00 EDT 1987

OSTI ID:5827591

Hamilton, J H; Ramayya, A V; Zhao, X; Maguire, C F; Ma, W C; KormickI, J; Wen, S; Chaturvedi, L; Chen, Z M; Cormier, T M

Now magic numbers for deformed shapes are established at N and Z of 38 and N of 60. These shell gaps at large deformation (..beta.. approx. = 0.4) are magic when the proton and neutron shell gaps reinforce each other. Other shell gaps for 34 and 36 are predicted to be important for oblate deformation. The competition between these oblate and the 38 prolate gaps as well as the 40 spherical shell gap are considered. In /sup 71/Se coexistence of oblate (..beta.. approx. = -0.24) and large prolate (..beta.. approx. = 0.4) shapes are observed. In /sup 72/Se the excited prolate band with large deformation which coexists with the near-spherical ground state is found to dominate the yrast spectrum to 28/sup +/. The moment of inertia of this band is essentially that of a rigid body. This moment of inertia supports the suggestion that the ''super deformation'', ..beta.. approx. = 0.4, being observed in this region may be associated with a collapse of pairing.

• Research Organization: Vanderbilt Univ., Nashville, TN (USA); Rochester Univ., NY (USA); EG and G Idaho, Inc., Idaho Falls (USA); Florida Univ., Gainesville (USA). Space Astronomy Lab.; Louisiana State Univ., Baton Rouge (USA); UNISOR, Oak Ridge, TN (USA)
• DOE Contract Number: AS05-76ER04935; AS05-76ER05034; AC05-76OR00033
• OSTI ID: 5827591
• Report Number(s): CONF-870970-20; ON: DE88002781
• Country of Publication: United States
• Language: English

Related Subjects

653001* -- Nuclear Theory-- Nuclear Structure
Moments
Spin
& Models
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DEFORMED NUCLEI
ENERGY LEVELS
GROUND STATES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEAR POTENTIAL
NUCLEAR STRUCTURE
NUCLEI
POTENTIALS
SELENIUM ISOTOPES
SHELL MODELS
SPHEROIDS
YUKAWA POTENTIAL