Abstract
The electromagnetic transition modes and level structure in 62Ni have been investigated via the radiative capture of thermal neutrons in 61Ni. Enriched samples of 92.11 % 61Ni were used as external targets in filtered reactor neutron beams. High-energy precision has been obtained by using Ge(Li) anti-Compton and Ge(Li) pair spectrometers. Coincidence relationships were found with a Ge(Li)-NaI(Tl) detector system, spin sequences and multipole mixing ratios have been deduced by measurements with a NaI-NaI angular correlation apparatus. The experimental data allow the construction of a considerably extended transition diagram up to 5 MeV with new spin and parity assignments for a large number of levels. The neutron separation energy of 62Ni was determined to be 10596.2±1.5 keV. Basing on intensities and δ-values, ratios of reduced transition rates can be given in some cases. The experimental level scheme and transition branching ratios are compared with results of several shell-model calculations. The agreement of excitation energies is fairly good up to 3.2 MeV.
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