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Title: Observation of the 1{sup +} scissors mode in the {gamma}-soft nucleus {sup 134}Ba

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.}

Authors:
; ; ; ; ; ; ;  [1]
  1. Institut fuer Strahlenphysik, Universitaet Stuttgart, 70569 Stuttgart (Germany)
Publication Date:
Research Org.:
Yale Univ., New Haven, CT (United States)
OSTI Identifier:
389470
DOE Contract Number:  
FG02-91ER40609
Resource Type:
Journal Article
Journal Name:
Physical Review, C
Additional Journal Information:
Journal Volume: 54; Journal Issue: 5; Other Information: PBD: Nov 1996
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; BARIUM 134 TARGET; PHOTONUCLEAR REACTIONS; NUCLEAR FRAGMENTS; BARIUM 134; EXCITATION; DIPOLES; SUM RULES; MIXING RATIO; PHONONS

Citation Formats

Maser, H, Pietralla, N, von Brentano, P, Herzberg, R, Kneissl, U, Margraf, J, Pitz, H H, Zilges, A, Institut fuer Kernphysik, Universitaet zu Koeln, 50937 Koeln, and WNSL, Yale University, P.O. Box 208124, New Haven, Connecticut 06520-8124. Observation of the 1{sup +} scissors mode in the {gamma}-soft nucleus {sup 134}Ba. United States: N. p., 1996. Web. doi:10.1103/PhysRevC.54.R2129.
Maser, H, Pietralla, N, von Brentano, P, Herzberg, R, Kneissl, U, Margraf, J, Pitz, H H, Zilges, A, Institut fuer Kernphysik, Universitaet zu Koeln, 50937 Koeln, & WNSL, Yale University, P.O. Box 208124, New Haven, Connecticut 06520-8124. Observation of the 1{sup +} scissors mode in the {gamma}-soft nucleus {sup 134}Ba. United States. doi:10.1103/PhysRevC.54.R2129.
Maser, H, Pietralla, N, von Brentano, P, Herzberg, R, Kneissl, U, Margraf, J, Pitz, H H, Zilges, A, Institut fuer Kernphysik, Universitaet zu Koeln, 50937 Koeln, and WNSL, Yale University, P.O. Box 208124, New Haven, Connecticut 06520-8124. Fri . "Observation of the 1{sup +} scissors mode in the {gamma}-soft nucleus {sup 134}Ba". United States. doi:10.1103/PhysRevC.54.R2129.
@article{osti_389470,
title = {Observation of the 1{sup +} scissors mode in the {gamma}-soft nucleus {sup 134}Ba},
author = {Maser, H and Pietralla, N and von Brentano, P and Herzberg, R and Kneissl, U and Margraf, J and Pitz, H H and Zilges, A and Institut fuer Kernphysik, Universitaet zu Koeln, 50937 Koeln and WNSL, Yale University, P.O. Box 208124, New Haven, Connecticut 06520-8124},
abstractNote = {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.}},
doi = {10.1103/PhysRevC.54.R2129},
journal = {Physical Review, C},
number = 5,
volume = 54,
place = {United States},
year = {1996},
month = {11}
}