The spin-parity of the 687.59keV level in 236U populated in the decay of 236Np is determined to be 2-in disagreement with recent 1-assignments from reaction data, but in accordance with previous radioactive 236Np decay studies. The 687keV ground state transition is shown to have a pure M2 character. The 642 keV 2---,2 + transition has EI:M2:E3 mixing ratios of 64:30:6. The half-life of the 2-state is 3.78_0.09ns. The hindrance factor of the El-part fits an E1 transition with A K = 2, the M2-part has the same transition rate as the M2 transitions in the neighbouring 237Np nucleus and the E3-part is enhanced by two orders of magnitude relative to the Weisskopf estimate. The data are compared to analogous transitions in the rare earth region.
ERadioactivity 236U from 238U(p, 3n); measured E~, Iv, Ece , Ice , cc, XK7delay , e-Tcoin, 236U deduced levels Ex, T1/2, K, J, 7r.
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