Inertial-confinement fusion-plasma-based cross-calibration of the deuterium-tritium γ-to-neutron branching ratio

被引：18
作者：
Jeet, J. [1 ]
Zylstra, A. B. [1 ]
Rubery, M. [1 ]
Kim, Y. [2 ]
Meaney, K. D. [2 ]
Forrest, C. [3 ]
Glebov, V [3 ]
Horsfield, C. J. [4 ]
McEvoy, A. M. [2 ]
Herrmann, H. W. [2 ]
机构：
[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[3] Lab Laser Energet, Rochester, NY 14623 USA
[4] Atom Weap Estab, Reading RG7 4PR, Berks, England
来源：
PHYSICAL REVIEW C | 2021年 / 104卷 / 05期
关键词：
14-MEV NEUTRONS; RAYS; SCATTERING; CAPTURE; CARBON;
D O I：
10.1103/PhysRevC.104.054611
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The deuterium-tritium (D-T) gamma-to-neutron branching ratio [H-3(d, gamma)He-5/H-3(d, n)He-4] has been determined previously under inertial-confinement fusion (ICF) conditions and in beam-target based experiments. In the former case, neutron-induced backgrounds are mitigated compared to the latter due to the short pulse nature of ICF implosions and the use of gas Cherenkov gamma-ray detectors. An added benefit of ICF based measurements is the ability to achieve lower center-of-mass energies as compared to accelerators. Previous ICF based experiments however report a large uncertainty in the D-T gamma-to-neutron branching ratio of approximate to 48%, which arises from the necessity of an absolute detector calibration and/or a cross-calibration against the (DHe)-He-3 gamma-to-proton branching ratio. A more precise value for the branching ratio based on data taken at the OMEGA laser facility is reported here, which relies on a cross-calibration against the better known C-12 neutron inelastic scattering cross section. A D-T branching ratio value of (4.6 +/- 0.6) x 10(-5) is determined by this method.
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页数：11
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