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Nuclear spectroscopy of Ta181

Muir, Arthur H., Jr. and Boehm, F. (1961) Nuclear spectroscopy of Ta181. Physical Review, 122 (5). pp. 1564-1573. ISSN 0031-899X. doi:10.1103/PhysRev.122.1564.

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The nuclear levels of Ta181 were investigated by a study of the β decay of Hf181 and the electron capture decay of W181. Evidence for weak M-shell conversion lines of an ∼6-kev transition in the Hf181 was found with a β spectrometer. An investigation of the W181 decay with this instrument revealed strong M-shell conversion lines corresponding to a 6.25±0.3-kev transition. With the aid of additional evidence, the conclusion is made that the 476-kev transition in the Hf181 decay occurs between the 482-kev level and a new level at 6 kev. On using an argon proportional counter, a 6-kev γ ray was also found in the W181 decay. The conversion coefficient of this transition was determined to be αT=44±7. This conversion coefficient and the M-subshell conversion ratios indicate that the 6-kev transition is of E1 multipolarity. The 6-kev level is assigned as the 9/2- [514] Nilsson intrinsic state. It is also concluded that the previously reported 152-kev transition in the W181 decay occurs between a new 11/2- (K=9/2-) rotational level at 158 kev and the 6-kev level. From a measurement of the tantalum L/K x-ray intensity ratio, the W181 decay energy is found to be 176-22+44 kev. The branchings of this decay to the various Ta181 levels are as follows: 158 kev (0.11%), 136 kev (0.067%), 6.25 kev (∼35%), and ground state (∼65%). All findings and proposals are consistent with predictions of the unified model of the nucleus.

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Additional Information:©1961 The American Physical Society. Received 16 January 1961. The authors wish to express their appreciation for the support and encouragement of Professor Jesse W. M. DuMond, and wish to acknowledge many helpful discussions with Dr. U. Hauser, Dr. G. Manning, Dr. G. Nijgh, and Dr. J. D. Rogers.
Issue or Number:5
Record Number:CaltechAUTHORS:MUIpr61
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3460
Deposited By: Tony Diaz
Deposited On:08 Jun 2006
Last Modified:08 Nov 2021 19:56

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