Measurement of total absorption for high energy rays

高エネルギー線の総吸収量の測定

北谷 文人  ; 原田 秀郎   ; 原 かおる; 宇都宮 弘章*; 後神 進史*; 海堀 岳史*; 豊川 弘之*

Kitatani, Fumito; Harada, Hideo; Hara, Kaoru; Utsunomiya, Hiroaki*; Goko, Shinji*; Kaihori, Takeshi*; Toyokawa, Hiroyuki*

高エネルギー領域において実験的に測定された例は少ない原子による線の減衰係数を波長可変の準単色線源であるレーザー逆コンプトン(LCS)線と高エネルギー・高分解能スペクトロメーターを用いて測定した。試料としてAlとCuを用いた結果、10MeV付近の測定で従来の計算結果とほぼ同等の値を得た。

Total absorption cross sections are most important data used in various fields related to the application of rays. However, the measurements of the total absorption cross section were difficult for high energy rays since there were no suitable ray sources. Recently, the nuclear photo-absorption measurement system using the laser-Compton backscattering (LCS) rays and the high-resolution high-energy photon spectrometer (HHS) were developed. We have utilized the system to measure the total absorption cross section, that is, the sum of the atomic and nuclear interactions. The total absorption cross sections at 10 MeV for Al and Cu have been measured with the system. The preliminary results show that the obtained values agree fairly with the theoretical.