Abstract
In an investigation of A = 153 isotopes fine structure was observed in /sup 153/Tm ..cap alpha.. decay. Besides the previously known ..cap alpha.. transitions that feed the /sup 149/Ho h/sub 11/2/ (0.0 keV) and s/sub 1/2/ (49.0 keV) isomers, two, very much weaker, ..cap alpha.. groups were found to populate the d/sub 3/2/ (220.4 keV) and d/sub 5/2/ (564.4 keV) states in /sup 149/Ho. Based on the /sup 149/Ho level scheme and on the Q/sub ..cap alpha../ values for the two main /sup 153/Tm ..cap alpha.. transitions, we determine that the h/sub 11/2/ level in /sup 153/Tm is the ground state and that the s/sub 1/2/ state lies 43 +- 7 keV above it. Energy systematics for the s/sub 1/2/ and h/sub 11/2/ proton states in even-N odd-Z nuclei near N = 82 are discussed.
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