Photonuclear data evaluation considering experimental double differential cross-sections

二重微分断面積測定データに基づく光核反応データ評価

Thi Hong Nguyen, T.*; 岩本 信之  ; 佐波 俊哉*

Thi Hong Nguyen, T.*; Iwamoto, Nobuyuki; Sanami, Toshiya*

Photonuclear reaction cross-section data are essential for electron accelerator shielding design and possibly nuclear transmutation. So far, photonuclear cross-sections of various target materials have been evaluated up to a photon energy of 200 MeV within the nuclear data libraries, such as JENDL-5. Almost all data in JENDL-5 have been evaluated based on the experimental reaction cross-section data. However, the evaluations using the reaction cross-section data are inadequate to provide all information about the emitted secondary particles, for instance, their energy distributions. Recently, the double differential cross-sections (DDXs) of photoneutron production on several heavy targets at 13 and 17 MeV monoenergetic photon energies have been measured by our group. As a result, we would like to introduce a new methodology to evaluate the photonuclear data based on the measured DDXs of photoneutrons for three monoisotope target materials, tantalum, gold, and bismuth, as a first step, using the CCONE code system. The assessment of this new methodology in comparison to the evaluation based on the experimental reaction cross-section data as well as further discussions will be presented at the meeting.