Measurement of Pb-208(N, gamma) Pb-209 Maxwellian averaged neutron capture cross section

作者：Weissman L^*; Tessler M; Arenshtam A; Eliyahu I; Halfon S; Guerrero C; Kaizer B; Kijel D; Kreisel A; Palchan T; Paul M; Perry A; Schimel G; Silverman I; Shor A; Tamim N; Vaintraub S

来源：PHYSICAL REVIEW C, 2017, 96(1): 015802.

DOI：10.1103/PhysRevC.96.015802

The doubly magic Pb-208 nucleus is a bottleneck at the termination of the s-process path due to its very low neutron capture cross section. This cross section is also important for the decomposition of s, r processes and U/Th radiogenic decay contributions to the Pb-Bi solar abundances. The Pb-208(n,gamma) Pb-209 cross section was measured at the Soreq Applied Research Accelerator Facility Phase I using an intense quasi-Maxwellian neutron source produced by irradiation of the liquid-lithium target with a 1.5-mA continuous-wave proton beam at 1.94 MeV. The cross section was measured by counting the beta activity from the irradiated lead target. The measurement allowed us to evaluate the Maxwellian averaged cross section (MACS) at 30 keV obtaining a value of 0.33(2) mb. This has been compared with the earlier activation and time-of-flight measurements found in the literature. The MACS cross-sectional value of the Cu-63(n,gamma) Cu-64 reaction was determined in the same experiment and is compared to a recent published value.

• 出版日期2017-7-25