Level Properties of 146Nd in the Decay of 146Pr

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Abstract
The decay of 24 min 146 Pr has been studied with Ge(Li), pure Ge, NaI(Tl) and plastic detectors in singles and coincidence modes. Sources were prepared by the chemical separation, called a rapid paper electrophoresis, from the fission products of 235 U. A total of 104 γ-ray transitions, 64 of them not reported before, have been observed and 88 transitions of them are incorporated into a level scheme comprising 32 excited states of 146 Nd. Observed Q β value was 4.15±0.15 MeV. Gamma-gamma directional angular correlation measurements in 146 Nd have been performed with 12 cascades each including 453.9 keV 2 + →0 + ground state transition. Spin assignments of 13 levels in 146 Nd were deduced. The low lying-states in 146 Nd are discussed in terms of the quasi band.