期刊
PHYSICAL REVIEW C
卷 92, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.92.054324
关键词
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资金
- DARPA (QuASAR program)
- ARO [W911NF-11-1-0369]
- NSF [PHY-1205311]
- NIST PMG [60NANB14D302]
- RCSA [20112810]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1255526, 1615233] Funding Source: National Science Foundation
We estimate the range of the radiative lifetime and energy of the anomalous, low-energy 3/2(+)(7.8 +/- 0.5 eV) state in the Th-229 nucleus. Our phenomenological calculations are based on the available experimental data for the intensities of M1 and E2 transitions between excited levels of the 229Th nucleus in the K-pi[N n (Z) Lambda] = 5/2(+)[633] and 3/2+[631] rotational bands. We also discuss the influence of certain branching coefficients, which affect the currently accepted measured energy of the isomeric state. From this work, we establish a favored region, 0.66 x 10(6)s eV(3) / omega(3) <= tau <= 2.2 x 10(6)s eV(3) / omega(3), where the transition lifetime tau as a function of transition energy omega should lie at roughly the 95% confidence level. Together with the result of Beck et al. [LLNL-PROC-415170 (2009)], we establish a favored area where transition lifetime and energy should lie at roughly the 90% confidence level. We also suggest new nuclear physics measurements, which would significantly reduce the ambiguity in the present data.
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