{sup 7}Li(n,{gamma}){sup 8}Li reaction and the S{sub 17} factor at E{sub c.m.}>500 keV
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 667-0047 (Japan)
- Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8550 (Japan)
- Department of Applied Physics, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8551 (Japan)
- The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-01 (Japan)
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-01 (Japan)
The partial cross sections from the neutron capture state to the ground and first excited states in {sup 8}Li have been separately determined for the first time at stellar neutron energy. The direct and weak cascade {gamma} rays from the capture and first excited states to the ground state were measured by means of anti-Compton NaI(Tl) and anti-Compton HPGe spectrometers, respectively. The {gamma}-ray branching ratio and the cross sections thus determined agree with that for thermal neutrons assuming a 1/v neutron velocity dependence. By comparing the cross sections with calculations based on the nonresonant direct capture mechanism it is shown that the cross sections are sensitive to the interaction potential of the incident neutron with the {sup 7}Li target nucleus. This analysis confirms the possibility of deriving the parameters necessary for the calculation of the astrophysical S factor S{sub 17}(E) for the {sup 7}Be(p,{gamma}){sup 8}B reaction in the upper energy range above 500 keV.
- OSTI ID:
- 20698704
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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