Mixed-symmetry octupole and hexadecapole excitations in the N=52 isotones
Journal article, 2014
Background: Excitations with mixed proton-neutron symmetry have been previously observed in the N=52 isotones. Besides the well-established quadrupole mixed-symmetry states (MSS), octupole and hexadecapole MSS have been recently proposed for the nuclei Zr92 and Mo94. Purpose: The heaviest stable N=52 isotone Ru96 was investigated to study the evolution of octupole and hexadecapole MSS with increasing proton number. Methods: Two inelastic proton-scattering experiments on Ru96 were performed to extract branching ratios, multipole mixing ratios, and level lifetimes. From the combined data, absolute transition strengths were calculated. Results: Strong M1 transitions between the lowest-lying 3- and 4+ states were observed, providing evidence for a one-phonon mixed-symmetry character of the 32(-) and 42+ states. Conclusions: sdg-IBM-2 calculations were performed for Ru96. The results are in excellent agreement with the experimental data, pointing out a one-phonon hexadecapole mixed-symmetry character of the 42+ state. The 31-||M1||32(-) matrix element is found to scale with the 2s+||M1||2ms+ matrix element.
Author
A. Hennig
Universitat zu Koln
M. Spieker
Universitat zu Koln
V. Werner
Yale University
Technische Universitat Darmstadt
T. Ahn
University of Notre Dame
Yale University
V. Anagnostatou
Yale University
University of Surrey
N.P. Cooper
Yale University
V. Derya
Universitat zu Koln
M. Elvers
Universitat zu Koln
Yale University
J. Endres
Universitat zu Koln
P. Goddard
Yale University
University of Surrey
Andreas Martin Heinz
Chalmers, Fundamental Physics
R.O. Hughes
University of Richmond
Yale University
G. Ilie
Yale University
Horia Hulubei National Institute of Physics and Nuclear Engineering
M.N. Mineva
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
P. Petkov
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
Universitat zu Koln
S.G. Pickstone
Universitat zu Koln
N. Pietralla
Technische Universitat Darmstadt
D. Radeck
Yale University
Universitat zu Koln
T.J. Ross
University of Surrey
University of Richmond
D. Savran
GSI Helmholtz Centre for Heavy Ion Research GmbH
Frankfurt Institute for Advanced Studies
A. Zilges
Universitat zu Koln
Physical Review C - Nuclear Physics
0556-2813 (ISSN) 1089-490X (eISSN)
Vol. 90 5 Art. no. 051302- 051302Subject Categories (SSIF 2011)
Subatomic Physics
Roots
Basic sciences
DOI
10.1103/PhysRevC.90.051302