Abstract
Particle-gamma-ray angular correlation studies of the 58Ni(p, p'γ) reaction have been used to determine the spins of the following states of 58Ni: 2.775 MeV (2), 2.943 MeV (0), 3.038 MeV (1, 2), 3.263 MeV (2), 3.420 MeV (3, 4), 3.531 MeV (0), 3.593 MeV (1), 3.620 MeV (2, 3, 4), 3.774 MeV (2, 3, 4), and 4.108 MeV (2). Gamma-ray branching ratios and mixing ratios were also measured. The Doppler-shift attenuation method has been used to measure the lifetimes of the states of 2.902 MeV (100−19+22 fs) and 3.774 MeV (400−100+200 fs) while the mean life of the 2.943 MeV level was found to be 2.9 ± 0.1 ns by direct timing. The internal conversion coefficient of the 2.943 (0+) MeV to 2.902 (1+) MeV has been measured to be 0.48 ± 0.05 and an upper limit of 2 % has been placed on the 2.943 MeV to ground state EO transition. The experimental energy level spectrum of 58Ni and electromagnetic transition rates are compared to shell-model predictions calculated using the two-body interaction matrix elements of Kuo.
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