Dynamic neutron sources from the \(^{207}\)Pb(\(\gamma\),n) and \(^{205}\)Tl(\(\gamma\),n) reactions

Mono-energetic gamma-beams (\(\Delta\sim 10\) eV) based on thermal neutron capture, in a nuclear reactor, using the V(n, \(\gamma\)) and Fe(n,\(\gamma\)) reactions, were utilized for generating fast neutron sources from lead and thallium respectively, via the \(^{207}\)Pb(\(\gamma\),n) and \(^{205}\...

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Bibliographic Details
Published in:arXiv.org 2022-09
Main Authors: Kahane, Sylvian, Ben-Dov, Yair, Moreh, Raymond
Format: Article
Language:English
Subjects:
Fast neutrons
Neutron emission
Neutron sources
Neutrons
Nuclear capture
Nuclear reactors
Resonance
Thallium
Thermal neutrons
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Summary:Mono-energetic gamma-beams (\(\Delta\sim 10\) eV) based on thermal neutron capture, in a nuclear reactor, using the V(n, \(\gamma\)) and Fe(n,\(\gamma\)) reactions, were utilized for generating fast neutron sources from lead and thallium respectively, via the \(^{207}\)Pb(\(\gamma\),n) and \(^{205}\)Tl(\(\gamma\),n) reactions. It so happened that one of the incident gamma-lines of the V source, E\(_\gamma\) = 7163 keV, photoexcites by chance a resonance level in \(^{207}\)Pb, which emits neutrons at an energy of 423 keV. In a similar manner, the incident \(\gamma\)-line at E\(_\gamma\) = 7646 keV of the Fe(n, \(\gamma\)) source photoexcites by chance a resonance level in the \(^{205}\)Tl isotope, which emits neutrons at an energy of 99 keV. The cross-sections for the neutron emission process were measured and found to be \(\sigma\)(\(\gamma\),n) = 35+/-6 mb and 107+/-17 mb respectively with intensities of the order of \(10^4\) n/sec.
ISSN:2331-8422
DOI:10.48550/arxiv.2111.11925