Measurement of Pb208(n,γ)Pb209 Maxwellian averaged neutron capture cross section

Measurement of Pb208(n,γ)Pb209 Maxwellian averaged neutron capture cross section The doubly magic Pb208 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 Pb208(n,γ)Pb209 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 β 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 Cu63(n,γ)Cu64 reaction was determined in the same experiment and is compared to a recent published value. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)
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Measurement of Pb208(n,γ)Pb209 Maxwellian averaged neutron capture cross section

Abstract

The doubly magic Pb208 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 Pb208(n,γ)Pb209 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 β 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 Cu63(n,γ)Cu64 reaction was determined in the same experiment and is compared to a recent published value.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
0556-2813
eISSN
1089-490X
D.O.I.
10.1103/PhysRevC.96.015802
Publisher site
See Article on Publisher Site

Abstract

The doubly magic Pb208 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 Pb208(n,γ)Pb209 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 β 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 Cu63(n,γ)Cu64 reaction was determined in the same experiment and is compared to a recent published value.

Journal

Physical Review CAmerican Physical Society (APS)

Published: Jul 25, 2017

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