Oblate collectivity in {sup 197,198}Pb

Conference · Wed Jul 01 04:00:00 EDT 1992

OSTI ID:10185584

Kuhnert, A; Wang, T F; Stoyer, M A; Becker, J A; Henry, E A; Brinkman, M J ^[1]; Yates, S W ^[1]; Draper, J E ^[2]; Deleplanque, M A; Diamond, R M; Stephens, F S ^[3]; Machiavelli, A O ^[3]; Kelly, W H ^[3]; Korten, W ^[3]; Azaiez, F ^[3]; Cizewski, J A ^[4]

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1. Lawrence Livermore National Lab., CA (United States)
2. California Univ., Davis, CA (United States)
3. Lawrence Berkeley Lab., CA (United States)
4. Rutgers--the State Univ., New Brunswick, NJ (United States)

Evidence for collective behavior in the high-spin region of neutron deficient lead nuclei is provided by the observation of four collective structures in {sup 197,198}Pb. These bands consist of strong dipole (M1) transitions with a few E2 crossover transitions observed. The transition energies of three of these bands show a rather regular behavior while those of one of them show an irregular behavior. We interpret the regular bands as oblate collective bands built on oblate proton and neutron states, whereas the irregular band might either be built on a state with very small oblate deformation, or be a triaxial rotational band. A lifetime measurement (DSAM) has been done for the regular bands in {sup 198}Pb. Neutron and proton configurations for the bands are suggested from the results of quasi particle Routhians and total Routhian surface (TRS) calculations.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48; AC03-76SF00098
• OSTI ID: 10185584
• Report Number(s): UCRL-JC--109657; CONF-920708--5; ON: DE93001303
• Country of Publication: United States
• Language: English

Related Subjects

663110
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
GAMMA DECAY
GENERAL AND AVERAGE PROPERTIES OF NUCLEI AND NUCLEAR ENERGY LEVELS
HIGH SPIN STATES
LEAD 197
LEAD 198
M1-TRANSITIONS
NUCLEAR DEFORMATION
NUCLEAR STRUCTURE