Mixed-symmetry octupole and hexadecapole excitations in the N=52 isotones
Artikel i vetenskaplig tidskrift, 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.

Författare

A. Hennig

Universität zu Köln

M. Spieker

Universität zu Köln

V. Werner

Technische Universität Darmstadt

Yale University

T. Ahn

Yale University

University of Notre Dame

V. Anagnostatou

Yale University

University of Surrey

N.P. Cooper

Yale University

V. Derya

Universität zu Köln

M. Elvers

Universität zu Köln

Yale University

J. Endres

Universität zu Köln

P. Goddard

University of Surrey

Yale University

Andreas Martin Heinz

Chalmers, Fundamental fysik

R.O. Hughes

University of Richmond

Yale University

G. Ilie

Yale University

Horia Hulubei National Institute of Physics and Nuclear Engineering

M.N. Mineva

Bulgarian Academy of Sciences

P. Petkov

Universität zu Köln

Bulgarian Academy of Sciences

S.G. Pickstone

Universität zu Köln

N. Pietralla

Technische Universität Darmstadt

D. Radeck

Yale University

Universität zu Köln

T.J. Ross

University of Richmond

University of Surrey

D. Savran

Frankfurt Institute for Advanced Studies

GSI Helmholtzzentrum für Schwerionenforschung

A. Zilges

Universität zu Köln

Physical Review C - Nuclear Physics

0556-2813 (ISSN) 1089-490X (eISSN)

Vol. 90 5 Art. no. 051302- 051302

Ämneskategorier

Subatomär fysik

Fundament

Grundläggande vetenskaper

DOI

10.1103/PhysRevC.90.051302