Nuclear data sheets for A = 221
- University of California Lawrence Berkeley Laboratory Berkeley, California 94720, USA
The available information on the decay characteristics and level structure for all nuclei with the mass number A = 221 is examined. A summary and evaluation of the experimental data, including adopted values and comparisons with theory, are presented. The individual level schemes are discussed, and comments pertaining to spin and parity assignments and to gamma-ray multipolarities are given. Any apparert discrepancies or inconsistencies are pointed out. It should be noted that most of the level information in the A = 221 mass chain is obtained from the alpha decay of the A = 225 parent. The spin and parity of the /sup 221/Fr g.s. has been the subject of much discussion in the literature. The spin assignments for the levels in /sup 221/Fr are highly correlated with spin and parity assignments suggested by the compilers in both the /sup 225/Ac parent (particularly the g.s.) and the /217/At daughter (particularly the 217.6-keV level). The spin assignments proposed for the levela in /sup 221/Fr must, therefore, be consistent with the available information on both the parent and the daughter. It should therefore be noted that any new information which would alter the suggested spin assignments in either of these nuclei may necessitate changes in the proposed assignments for /sup 221/Fr. The level schemes of each of the A = 221 nuclei are shown first, followed by the data used in calculating alpha -hindrance factors. The information on the respective A = 221 nuclei, listed in order of increasing Z, is presented according to the following format: the experimental decay data and their evaluation; reaction data (if any); a summary of the level properties and spin assignments; a discussion of gamma-ray properties; and compilers' comments. The reference list is given at the end of the A = 221 review. All information obtained prior to May 1973 is included. (auth)
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- US Atomic Energy Commission (AEC); National Science Foundation (NSF)
- NSA Number:
- NSA-29-017314
- OSTI ID:
- 4356886
- Journal Information:
- Nucl. Data Sheets, v. 10, no. 6, pp. 625-641, Vol. 10; Other Information: Orig. Receipt Date: 30-JUN-74
- Country of Publication:
- United States
- Language:
- English
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