Quasirotational Levels inGd152and Excited Levels ofTb152from the Decay of 4.2-minTb152m
- 1 March 1971
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review C
- Vol. 3 (3), 1275-1287
- https://doi.org/10.1103/physrevc.3.1275
Abstract
In the decay of the 4.2-min isomeric state in , rays are found to be associated with the deexcitation of levels in and rays with that in . Experimental studies were made chiefly with Ge(Li)-ray detectors in singles and coincidence modes. Conversion-electron spectra were obtained with a Si(Li) spectrometer. The isomeric state, believed to be an state, is at 501.8 keV, and the isomeric transition is a 159.59-keV transition to a level at 342.2 keV. Other levels in are proposed at 58.9, 65.1, and 106.7 keV. An alternative but less likely level scheme is also possible. The ground state () and levels at 58.9, 342.2, and 501.8 keV appear to be best described in terms of Nilsson states. The electron-capture decay of the 501.8-keV isomeric state is by an allowed unhindered transition () which leads almost entirely to a level at 2394.5 keV in . The deexcitation of the latter level populates and members of the quasiground-state and quasi--vibrational bands. The quasirotational character of levels in which has been proposed by Sakai and coworkers appears to be amply confirmed. A previously unreported level in at 1861.7 keV () is proposed. In contrast to previous work, no -decay branch was observed.
Keywords
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