Speaker
Description
Lithium targets are commonly employed to produce “fusion-relevant” neutrons in fusion technology validation facilities, where proton-lithium (p-Li) reactions serve as the primary neutron source. Accurate neutron production cross sections are critical for facility designs, shielding calculations, and dosimetry. However, the quality and consistency of available proton-induced lithium nuclear data remain insufficiently assessed compared to neutron-induced ones.
This study evaluated the quality of neutron production data in p-7Li reactions with the p-Li experiment at the quasi monoenergetic neutron generator at the Nuclear Physics Institute of the Czech Academy of Sciences, Czech Republic [1]. The MCNP6.2 calculation results with the official ACE files of JENDL-5 and ENDF/B-VIII.0 were significantly different from the measured results.
1) The neutron spectra calculated with JENDL-5 had similar shapes to the measured ones, but the absolute values were different.
2) The neutron spectra calculated with ENDF/B-VIII.0 had different shapes and absolute values from the measured ones.
The neutron production cross section of 7Li in ENDF/B-VIII.0 is much smaller above 10 MeV than those in JENDL-5 because of lack of the (p,n+He3+He4) reaction, etc., which is considered to be the reason of the difference between the calculated neutron spectra with JENDL-5 and ENDF/B-VIII.0.
We have also studied the p-Li experiment at the Cyclotron and Radioisotope Center of Tohoku University, Japan [2]. The results will be presented in the workshop.
References
[1] Zdeněk Matěj, et al., The methodology for validation of cross sections in quasi mono energetic neutron field, Nuclear Instruments and Methods in Physics Research A 1040 (2022) 167075.
[2] Yoshitomo Uwamino, et al., High-energy p-Li neutron field for activation experiment, Nuclear Instruments and Methods in Physics Research A 389 (1997) 463-473.
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