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Problem on gammas emitted in capture reaction of TENDL-2019 and JEFF-3.3

TENDL-2019とJEFF-3.3の捕獲反応で放出されるガンマ線の問題

今野 力  ; 権 セロム*

Konno, Chikara; Kwon, Saerom*

TENDL-2019の多くの核種、JEFF-3.3のいくつかの核種の捕獲反応から放出される2次ガンマ線に高エネルギーガンマ線ピークがないことを見つけた。この問題は、数keV以下の中性子エネルギーで放射線損傷計算で使われる損傷エネルギー断面積を極端に小さくしてしまうだけでなく、遮蔽計算で生成するガンマ線を減少させてしまう。TENDL-2019とJEFF-3.3の問題の核種の2次ガンマ線のエネルギー分布は修正が必要である。

We found that a lot of nuclei in TENDL-2019 had no high-energy gamma peaks in secondary gamma spectra from the capture reaction and several nuclei in JEFF-3.3 also have. This problem causes not only drastically small damage energy production cross sections for radiation damage calculations at incident neutron energies below a few keV but also smaller gamma productions in shielding calculations. The problematic energy distribution data for secondary gammas in TENDL-2019 and JEFF-3.3 should be revised.

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