Abstract
Reduced transition probabilities have been measured for the neutron-rich nuclei with relativistic Coulomb excitation performed at the RIKEN Nishina Center. For the even-even Ni isotope the determined value is compatible within errors with the result of a previous intermediate energy Coulomb excitation experiment, although being somewhat larger. For the odd Ni isotopes values have been determined for the first time. In the middle shell nucleus three peak candidates have been observed and tentatively assigned to the (), (), and () excitations. Two peak candidates have been observed in and tentatively assigned to the () and () levels. The measured values are in line with the large reported in and at variance with the small strength measured in . Excitation energies compare well with the result of large-scale shell-model calculations, while values are larger than predicted. This could indicate an increasing contribution of proton excitations across the shell closure when approaching .
- Received 29 November 2019
- Accepted 1 July 2020
DOI:https://doi.org/10.1103/PhysRevC.102.014323
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