Global Calculation of Nuclear Shape Isomers
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Department of Mathematical Physics, Lund Institute of Technology, P. O. Box 118, SE-22100 Lund (Sweden)
- Center for Mathematical Sciences, University of Aizu Aizu-Wakamatsu, Fukushima 965-80 (Japan)
- RIKEN Nishina Center, RIKEN, Wako, Saitama 351-0198 (Japan)
To determine which nuclei may exhibit shape isomerism, we use a well-benchmarked macroscopic-microscopic model to calculate potential-energy surfaces as functions of spheroidal (epsilon{sub 2}), hexadecapole (epsilon{sub 4}), and axial-asymmetry (gamma) shape coordinates for 7206 nuclei from A=31 to A=290. We analyze these and identify the deformations and energies of all minima deeper than 0.2 MeV. These minima may correspond to characteristic experimentally observable shape-isomeric states. Shape isomers mainly occur in the A=80 region, the A=100 region, and in an extended region centered around {sup 208}Pb. We compare our model to experimental results for Kr isotopes. Moreover, in a plot versus N and Z we show for each of the 7206 nuclei the calculated number of minima. The results reveal one fairly unexplored region of shape isomerism, which is experimentally accessible, namely the region northeast of {sub 82}{sup 208}Pb.
- OSTI ID:
- 21370850
- Journal Information:
- Physical Review Letters, Vol. 103, Issue 21; Other Information: DOI: 10.1103/PhysRevLett.103.212501; (c) 2009 The American Physical Society; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
Similar Records
Decays of New Nuclides and Isomers Beyond the Proton Drip Line--The Influence of Neutron Configurations
Isomer Tagging with a Dual Multi-Wire Proportional Counter and a Differential Plunger