Nuclear data sheets for A=84.
The evaluated spectroscopic data are presented for 12 known nuclides of mass 84 (Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo). Except for the stable nuclides {sup 84}Sr and {sup 84}Kr, extensive new data are available for all the other nuclides since the 1997 evaluation by J.K. Tuli (1997Tu02) of A = 84 nuclides. Many precise Penning-trap mass measurements since AME-2003 for A = 84 nuclides (2009Re03,2008Ha23,2008We10,2007Ke09,2006Ka48,2006De36,2006Ri15) have resulted in improved Q values and separation energies. However, many deficiencies still remain. Some examples are given below. Excited-state data for {sup 84}Ga and {sup 84}As are nonexistent, and those for {sup 84}Ge are scarce. The radioactive decay schemes of {sup 84}Ga, {sup 84}Ge, {sup 84}Se, {sup 84}Y (39.5 min), {sup 84}Y (4.6 s), {sup 84}Zr and {sup 84}Nb suffer from incompleteness and that for {sup 84}Mo decay is not known at all. The energy ordering of the two activities (39.5 min and 4.6 s) of {sup 84}Y is not well established, although, high-spin with tentative spin-parity of (6+) is adopted here as the ground state of {sup 84}Y based on weak arguments. From a conference report published in 2000, it is clear that extensive experiments were done to investigate decays of {sup 84}Zr and {sup 84}Y, but details of these studies never appeared in literature and none were made available to the evaluators when requested from original authors. This evaluation was carried out as part of ENSDF workshop for Nuclear Structure and Decay Data Evaluators, organized and hosted by the 'Horia Hulubei' National Institute for Physics and Nuclear Engineering, Bucharest, Romania during March 30, 2009 - April 3, 2009. Names of the evaluators principally responsible for evaluation of individual nuclides are given under the respective Adopted data sets.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 969636
- Report Number(s):
- ANL/NE/JA-65543; NDTSBA; TRN: US1000341
- Journal Information:
- Nucl. Data Sheets, Vol. 110, Issue 11 ; 2009; ISSN 0090-3752
- Country of Publication:
- United States
- Language:
- ENGLISH
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