Isovector dipole and quadrupole excitations in 66Zn

A. Gade, H. Klein, N. Pietralla, and P. von Brentano
Phys. Rev. C 65, 054311 – Published 29 April 2002
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Abstract

The nucleus 66Zn is investigated using γγ-coincidence studies following the β decay of the 0+ ground state of 66Ga. The data survey short-lived Jπ=1+,2+ states, E2/M1 mixing ratios, and, together with the previously known lifetimes, also absolute transition strengths B(σL). The proton-neutron mixed-symmetry states 2ms+ (isovector quadrupole excitation) and 1ms+ (“scissors mode”) were identified from their decay patterns and absolute transition strengths. A γ transition between these mixed-symmetry states was observed and its rate is discussed. We additionally present a candidate for the two-phonon 22,ms+ state, whose structure is closely related to the 1ms+ excitation. Fifteen M1 and E2 strengths involving mixed-symmetry states show a reasonable agreement with the prediction of the pure O(6) limit of the proton-neutron extension of the interacting boson model (IBM-2) using the effective quadrupole boson charges eπ+eν and the g-factor difference gπgν as the only free parameters.

  • Received 21 December 2001

DOI:https://doi.org/10.1103/PhysRevC.65.054311

©2002 American Physical Society

Authors & Affiliations

A. Gade, H. Klein, N. Pietralla, and P. von Brentano

  • Institut für Kernphysik der Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany

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Vol. 65, Iss. 5 — May 2002

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