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Abstract
Isomeric states of 69Se were produced via the heavy-ion compound-nucleus process and from the positon decay of 69Br, the former producing a high-spin state and the latter preferentially populating a low-spin state. Ge(Li) detectors as well as scintillation counting showed that the high-spin state decays with T 1 2 = 14.0 ± 1.0 min to levels in 69As, giving rise to γ-rays of 116, 166 and 282 keV. The low-spin state decays predominantly to a state giving rise to a 145 keV γ-ray with T 1 2 = 1.8 ± 0.2 min. The beta end-point energy of both isomers is 5.2 ± 0.2 MeV. It is deduced that the high-spin state, assigned J π = 9 2 +, is the ground state; the isomeric state had J π = 3 2 −. The angular momentum inversion as compared to neutron-excess Se isotopes is attributed to Coriolis coupling to a deformed core as described by Malik and Scholz.
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