Superdeformation in the A = 190 region: The lead nuclei

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

OSTI ID:6967019

Henry, E A; Becker, J A; Brinkman, M J; Kuhnert, A; Stoyer, M A; Wang, T F; Yates, S W ^[1]; Azaiez, F A; Beausang, C W; Burde, J; Deleplanque, M A; Diamond, R M; Draper, J E; Kelly, W H; Korton, W; Macchiavelli, A O; Oliveira, J; Rubel, E; Stephens, F S ^[2]; Cizewski, J A ^[3]

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

Superdeformed (SD) bands have been identified in the four even-even lead nuclei [sup 192]Pb, [sup 194]Pb, [sup 196]Pb, and [sup 198]Pb. The discovery of SD bands in these nuclei extended the region of superdeformation in the A = 190 region to Z = 82, and to neutron numbers up to N = 116. All of the SD bands in these nudei are observed with transition energies ranging from about 250 key to about 600 keV, with the lowest energy SD band transition for the entire region of 169 keV in [sup 194]Pb. The spins deduced for the lowest levels in the SD bands are (10,11), 6,8, and 12 for [sup 192,194,196,198]Pb, respectively. The dynamic moments of inertia of [sup 192]Pb and [sup 194]Pb are similar to each other, and to those of many other SD bands in this mass region. The dynamic moments of inertia of [sup 196]Pb and [sup 198]Pb are somewhat lower than those of [sup 192,194]Pb at a given frequency. The experimental lifetimes in [sup 194]Pb and the deduced transition quadrupole moments are equal to those of other nudei in the region within errors. While SD bands have been observed in the odd-neutron Hg and Tl nuclei, SD bands have not been reported for the odd-neutron Pb nuclei. In this contribution we discuss briefly three topics on superdeformation in the lead nuclei. First, we have recent experimental data on [sup 196]Pb that extends our knowledge of the SD band in that nucleus. Next we review briefly the population of low-lying yrast levels from the decay of the SD bands in [sup 192,194,1296]Pb. Finally, we summarize our efforts to identify superdeformation in the odd-A Pb nuclei. All of the experiments described here were performed using the HERA spectrometer at the 88-Inch Cyclotron facility located at Lawrence Berkeley Laboratory.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE; National Science Foundation (NSF); USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48; AC03-76SF00098
• OSTI ID: 6967019
• Report Number(s): UCRL-JC-109942; CONF-9205108-16; ON: DE93001321; TRN: 92-038066
• Resource Relation: Conference: International conference on nuclear structure at high angular momentum, Ottawa (Canada), 18-21 May 1992
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
LEAD ISOTOPES
NUCLEAR DEFORMATION
EVEN-EVEN NUCLEI
GAMMA DECAY
HEAVY ION REACTIONS
MOMENT OF INERTIA
NUCLEAR STRUCTURE
CHARGED-PARTICLE REACTIONS
DECAY
DEFORMATION
ISOTOPES
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
663110* - General & Average Properties of Nuclei & Nuclear Energy Levels- (1992-)