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Measurement of total $$gamma$$ absorption for high energy $$gamma$$ rays

高エネルギー$$gamma$$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$$gamma$$線の減衰係数を波長可変の準単色$$gamma$$線源であるレーザー逆コンプトン(LCS)$$gamma$$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 $$gamma$$ absorption cross sections are most important data used in various fields related to the application of $$gamma$$ rays. However, the measurements of the total $$gamma$$ absorption cross section were difficult for high energy $$gamma$$ rays since there were no suitable $$gamma$$ ray sources. Recently, the nuclear photo-absorption measurement system using the laser-Compton backscattering (LCS) $$gamma$$ rays and the high-resolution high-energy photon spectrometer (HHS) were developed. We have utilized the system to measure the total $$gamma$$ absorption cross section, that is, the sum of the atomic and nuclear interactions. The total $$gamma$$ 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.

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