Shape isomers: Mean-field description and beyond

Conference · Mon Nov 19 04:00:00 EST 1990

OSTI ID:6354538

Bonche, P; Krieger, S J; Weiss, M S ^[1]; Dobaczewski, J ^[2]; Flocard, H ^[3]; Heenen, P H ^[4]; Meyer, J ^[5]

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1. Lawrence Livermore National Lab., CA (USA)
2. Warsaw Univ. (Poland). Inst. Fizyki Teoretycznej
3. Paris-11 Univ., 91 - Orsay (France). Div. de Physique Theorique
4. Universite Libre de Bruxelles (Belgium)
5. Lyon-1 Univ., 69 - Villeurbanne (France). Inst. de Physique Nucleaire

Nuclear Hartree-Fock (HF) + BCS calculations have led to predictions of shape isomerism in isotopes of Pt, Hg and Os nuclei. These have been confirmed through the observation of superdeformed rotational bands in {sup 190,{hor ellipsis},194}Hg. Encouraged by these measurements and similar observations in {sup 194}Pb, we have extended these calculations to a wide range of contiguous nuclei. These HF results, for {sup 192,194}Pt, {sup 190,{hor ellipsis},198}Hg and {sup 194}Pb, have been employed in a Generator Coordinate Method (GCM) calculation utilizing the quadrupole deformation as the generating variable. The resulting spectra confirm the conclusions drawn from the HF results and agree with those experiments which have been performed. Adding a phenomenological assumption for the moments of inertia of our GCM states, we can construct the radiative transitions within and out of the superdeformed band. The results are in good agreement with the observed de-population of the superdeformed band built upon the shape isomer both in minimum angular momentum and in rapidity of de-population. Inferences for the existence of shape isomers will be drawn. 19 refs., 4 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOD; DOE/DP; NATO
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6354538
• Report Number(s): UCRL-JC-105461; CONF-901057--25; ON: DE91006254; CNN: RG 85/0195
• Country of Publication: United States
• Language: English

Related Subjects

653001* -- Nuclear Theory-- Nuclear Structure
Moments
Spin
& Models
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DEFORMATION
GAMMA SPECTROSCOPY
HAMILTONIANS
HARTREE-FOCK METHOD
ISOMERIC NUCLEI
ISOTOPES
LEAD ISOTOPES
MATHEMATICAL OPERATORS
MEAN-FIELD THEORY
MERCURY ISOTOPES
MOMENT OF INERTIA
NUCLEAR DEFORMATION
NUCLEI
OSMIUM ISOTOPES
PLATINUM ISOTOPES
QUADRUPOLE MOMENTS
QUANTUM OPERATORS
SPECTROSCOPY
VARIATIONAL METHODS