Abstract
Gamma-ray singles spectra of extremely pure (chemically and isotopically) samples of , with strengths of mCi, have been measured with a high-resolution 2-cm10-mm germanium LEPS detector and with a 25% Ge spectrometer. Gamma rays with intensities as low as % per α decay have been identified. The electron spectrum of a mass-separated source was measured with a cooled Si(Li) electron spectrometer. The spectrum provided the conversion coefficients of low-energy transitions in and thereby their multipolarities. The present measurements confirm the previous assignments of single-particle states in . These include [620], 0.0 keV; [613], 106.30 keV; [622], 177.59 keV; [725], 370.47 keV; [734], 433.91 keV; [622], 543.98 keV; [750], 632.0 keV; [615], 683 keV; and [604], 974.0 keV. A vibrational band was identified in previous studies at 981.4 keV and given an assignment of . Three new vibrational bands are identified in the present work at 942.5, 1086.5, and 1250.0 keV with tentative assignments , and , respectively. A level was identified at 1185.5 keV with spin of 5/2 or 7/2 but it was not given any configuration assignment. Another level was identified at 1077.5 keV and given a spin of 9/2. Again, no configuration could be assigned to this level.
- Received 10 June 2005
DOI:https://doi.org/10.1103/PhysRevC.72.054308
©2005 American Physical Society