Abstract
We studied excited states in 62Zn up to an excitation energy of 5.5 MeV via the 61Ni( 3He, 2n γ) reaction at the Cologne Tandem accelerator with the high-efficiency HORUS cube spectrometer. We identified several multi-phonon excitations, especially two fragments of the one-phonon mixed-symmetry state 2 1 , MS + based on effective M1 and E2 transition strengths. The quantities were obtained from γγ angular correlation and Doppler-shift measurements. Shell-model calculations performed for 62Zn give clear support for the fragmentation of the one-phonon mixed-symmetry 2 1 , MS + state. The assumption of 62Zn being a vibrator-like nucleus is supported by calculations of excitation energies and E2 and M1 transition strengths within the U(5) limit of the neutron–proton Interacting Boson Model.
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