Abstract
The γ-radiation resulting from the capture of unpolarized thermal, 2 and 24 keV neutrons in enriched 63Cu, and of polarized thermal neutrons in 63Cu oriented at low temperature has been investigated. Of the 323 γ-rays observed 299 could be placed in a 64Cu level scheme containing 109 levels. The reaction Q-value amounts to 7916.09(12) keV. The χ 2 analysis of the γ-ray angular distributions obtained from capture of polarized neutrons in oriented 63Cu resulted in three unambiguous spin assignments for levels in 64Cu. The fraction of the J π = 1 − channel in the thermal capture was determined as (94 ± 2)%. For one level an unambiguous spin assignment has been obtained from the decay scheme.
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