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
University of Cologne
M. Spieker
University of Cologne
V. Werner
Technische Universität Darmstadt
Yale University
T. Ahn
University of Notre Dame
Yale University
V. Anagnostatou
University of Surrey
Yale University
N.P. Cooper
Yale University
V. Derya
University of Cologne
M. Elvers
University of Cologne
Yale University
J. Endres
University of Cologne
P. Goddard
University of Surrey
Yale University
Andreas Martin Heinz
Chalmers, Fundamental Physics
R.O. Hughes
Yale University
University of Richmond
G. Ilie
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
Yale University
M.N. Mineva
Bulgarian Academy of Sciences
P. Petkov
Bulgarian Academy of Sciences
University of Cologne
S.G. Pickstone
University of Cologne
N. Pietralla
Technische Universität Darmstadt
D. Radeck
Yale University
University of Cologne
T.J. Ross
University of Richmond
University of Surrey
D. Savran
Frankfurt Institute for Advanced Studies
Helmholtz
A. Zilges
University of Cologne
Physical Review C - Nuclear Physics
24699985 (ISSN) 24699993 (eISSN)
Vol. 90 5 Art. no. 051302- 051302Subject Categories
Subatomic Physics
Roots
Basic sciences
DOI
10.1103/PhysRevC.90.051302