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Author Maser, H. ♦ Pietralla, N. ♦ von Brentano, P. ♦ Herzberg, R. ♦ Kneissl, U. ♦ Margraf, J. ♦ Pitz, H. H. ♦ Zilges, A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ BARIUM 134 TARGET ♦ PHOTONUCLEAR REACTIONS ♦ NUCLEAR FRAGMENTS ♦ BARIUM 134 ♦ EXCITATION ♦ DIPOLES ♦ SUM RULES ♦ MIXING RATIO ♦ PHONONS
Abstract A photon scattering experiment was performed on the {gamma}-soft nucleus {sup 134}Ba with photon energies of {ital E}{sub {gamma}}{lt}4.1. Around 3 MeV excitation energy a fragmented 1{sup +} scissors mode as well as the (2{sup +}{circle_times}3{sup {minus}}){sub 1{sup {minus}}} two-phonon dipole state were identified. The dipole excitation strengths were measured. The excitation strength of the scissors mode in this {gamma}-soft nucleus is well reproduced by an empirical {ital M}1 sum rule that generalizes the {open_quote}{open_quote}{delta}{sup 2} law{close_quote}{close_quote} to nuclei without axial symmetry. The IBM-2 describes the mixed-symmetry states in {sup 134}Ba and their decay pattern. A large {ital E}2/{ital M}1 mixing ratio for the 1{sup +}{r_arrow}2{sup +}{sub 1} decay of the scissors mode to the 2{sup +}{sub 1} state is predicted by the IBM-2. The new result from {sup 134}Ba together with a similar previous observation in {sup 196}Pt corroborates the scissors mode as a typical excitation mode of {gamma}-soft nuclei. {copyright} {ital 1996 The American Physical Society.}
ISSN 05562813
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-11-01
Publisher Department Yale University
Publisher Place United States
Journal Physical Review, C
Volume Number 54
Issue Number 5
Organization Yale University


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