Near-oblate collectivity in {sup 196}Hg

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Bulletin of the American Physical Society

OSTI ID:243910

Cederwall, B; Deleplanque, M A; Azaiez, F ^[1]

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1. and others

Recently a new spectroscopy of {open_quotes}oblate{close_quotes} {Delta}I = 1 bands in the mass 190 region has emerged. The authors present here the observation of a regular rotational-like {Delta}I = 1 band in {sup 196}Hg extending up to an excitation energy of E* {approx} 8.7 MeV and spin I {approx} 30{h_bar}. This is the second observation of a band of this character in a mercury isotope. The high spin states in the nucleus {sup 196}Hg were populated in the reaction {sup 192}Os({sup 9}Be,5n) at a beam energy of 65 MeV from the LBL 88-Inch Cyclotron facility. The experimental results are compared with mean field calculations and semiclassical estimates based on the Doenau-Frauendorf formalism. The authors conclude that the significantly lower B(M1)/B(E2) branching ratios observed in {sup 193}Hg and presently in {sup 196}Hg as compared with similar bands in light lead nuclei may be explained by a difference in single particle structure resulting from a pair of aligned h{sub 11/2} proton hole states rather than by significant differences in deformation.

• OSTI ID: 243910
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COLLECTIVE EXCITATIONS
DEFORMED NUCLEI
E2-TRANSITIONS
M1-TRANSITIONS
MERCURY 196