STELLAR PRODUCTION CROSS-SECTION OF LU-176(M)

被引：11
作者：
ZHAO, WR
KAPPELER, F
机构：
[1] Kernforschungszentrum Karlsruhe, Institut f̈r Kernphysik, D-7500, Karlsruhe
来源：
PHYSICAL REVIEW C | 1991年 / 44卷 / 01期
关键词：
D O I：
10.1103/PhysRevC.44.506
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The partial neutron capture cross section of Lu-175 to the isomer Lu-176m has been measured at kT = 25 keV via the activation technique. Systematic uncertainities were carefully evaluated by two independent methods for determination of the induced activities and by variation of the relevant experimental parameters. The final cross section of 1135 +/- 30 mb was derived from six different activations. With this result, the production of the long-lived ground state Lu-176g (t1/2 = 41 Gyr) by s-process neutron captures would not be sufficient to account even for the observed lutetium abundance. Consequently, other mechanisms, e.g., thermally induced transitions from the isomer to the ground state must have enhanced the yield of Lu-176g during the s process.
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页码：506 / 513
页数：8
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