Elsevier

Nuclear Physics A

Volume 261, Issue 2, 26 April 1976, Pages 317-327
Nuclear Physics A

Level structure of 73Se from the 72Ge(α, 3nγ) reaction

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Abstract

States of 73Se, excited through 72Ge(α, 3nγ) at Eα = 30 to 55 MeV, were studied. Excitation function, γ-ray angular distributions and γ-γ coincidences were determined. Levels at the following energies in keV (spin-parity) are proposed: 151(32), 505(52), 804(72) and 1178(92). These levels, together with the hitherto known 12 state at 25 keV, exhibit a K = 12 quasi-rotational structure as regards the energy spacings and branching ratios. A similar recent finding in 75Se suggests that such a structure is not uncommon in this region of the periodic table. In spite of its spin, no decay into the 72+ ground state, interpreted by Kuriyama et al. as a deformed three dressed quasiparticle state, is observed although such a decay should be favoured in the present reaction.

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