C 13 ( n , 2 n γ ) C 12 γ -ray production in the 14–16 MeV incident neutron energy range
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Ohio University, Athens, OH (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
We report γ-ray emission from 12C and 13C samples irradiated with deuterium-tritium fusion neutrons was experimentally measured at the Omega Laser Facility and at the Ohio University Edwards Accelerator Laboratory. The intent of these measurements was to determine the feasibility of using 13C-based plastic ablators with embedded 12C layers for “dark mix” diagnosis of inertial confinement fusion implosions. Spectrally resolved measurements at Ohio University identified significant 4.44-MeV γ-ray emission from the 13C(n, 2nγ)12C-L1 reaction channel. The recorded 4.44-MeV 13C signal was compared against emission from an identically irradiated 12C target with known 12C(n, n'γ)12C-L1 cross section, which resulted in an average 13C(n, 2nγ)12C-L1 cross section of 117 ± 17 mb over the incident neutron energy distribution range from 14.4 to 15.8 MeV. Integrated 13C γ -ray signals above 2.9 MeV recorded with the Gas Cherenkov Detector at Omega exceeded MCNP6.1 predictions by a factor of 3. The additional signal was attributed to 4.44-MeV γs resulting in an inferred 13C(n, 2nγ)12C-L1 cross section of 95 ± 11 mb at 14.1-MeV average incident neutron energy. As a result, the 13C-based “dark mix” diagnostic concept was deemed infeasible.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1889969
- Report Number(s):
- LA-UR-20-25310; TRN: US2310001
- Journal Information:
- Physical Review. C, Vol. 103, Issue 6; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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