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Identification of the (9/2+ to (5/2- transition in Se-69

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DOI: 10.1103/PhysRevC.37.645
OAI: oai:inspirehep.net:275791
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INSPIRE-HEP
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Abstract

Gamma rays from Se69 have been investigated using the reaction Ca40(32S,2pn γ)69Se between 80 and 110 MeV beam energy. Isotopic identification was based on excitation functions, n-γ and n-γ-γ coincidences, as well as genetic relationships. An isomeric state (T1/2=853±78 ns) was found at 575.0±0.4 keV decaying to the first excited state which was located at 40.2±0.3 keV. The isomeric state lifetime reveals the same degree of inhibition as in analogous M2 ((9/2+→(5/2−) transitions and the excitation energy displays the systematic trend of the first (9/2+ state in the N=35 and N=37 isotones. The observed γ decay properties are consistent with Jπ=(3/2− for the Se69 ground state, in agreement with the indications given by previous beta decay studies. A first level scheme, including four levels in Se69, is proposed.

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