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

Conference · Thu Dec 10 04:00:00 EST 1987 · AIP Conf. Proc.; (United States)

OSTI ID:5400867

Eberth, J; Wiosna, M; Mylaeus, T; Schmal, N; Skoda, S; Busch, J; Teichert, W; Brentano, P v; Hamilton, J H; Ramayya, A V; others, and

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: University of Koeln, Koeln, W. Germany
• OSTI ID: 5400867
• Report Number(s): CONF-870970-
• Conference Information: Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 164:1
• 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
GAMMA SPECTRA
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
NILSSON-MOTTELSON MODEL
NUCLEAR MODELS
NUCLEI
OSCILLATION MODES
PAIRING INTERACTIONS
SELENIUM ISOTOPES
SINGLE-PARTICLE MODES
SPECTRA
YRAST STATES