ENERGY LEVELS OF LU-176

The γ-ray spectrum from thermal-neutron capture in enriched targets of Lu175 has been studied in four energy intervals using Ge(Li) and Si(Li) detectors. Twenty transitions in the energy region between 5.3 and 6.0 MeV have been observed in Lu176 with a Ge(Li) detector operated in conjunction with a large NaI detector as a two-quantum escape spectrometer. Low-energy γ radiation has been measured from 20-1000 keV in both singles and γ-γ coincidence experiments. Data from the reaction Lu176(d,d′) have been analyzed. The combination of results of these experiments with those previously reported in the literature has resulted in the following spectroscopic interpretation of levels in Lu176 (denoted by band-head energy in keV, Kπ, and Nilsson configuration): ground state, 7-[404+514]; 126.5, I=1, 0-[404-514]; 198.0, 1+[404-624]; 390.2, 1-[404-512]; 662.0, 3-[404-510]; and 791.5, 4-[404+510]. The neutron separation energy of Lu176 is determined to be 6293±4 keV. © 1969 The American Physical Society.