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High resolution spectroscopy of the giant resonance in the $$^{16}$$O($$gamma$$,abs) reaction

$$^{16}$$O($$gamma$$, abs)反応における巨大共鳴の高分解能測定

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

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

レーザー逆コンプトン光と高分解能・高エネルギー光子スペクトロメータ(HHS)を用いた光核吸収断面積測定手法の適用範囲を30MeVに拡張するとともに高精度化したHHSの応答関数を用いて、$$^{16}$$O($$gamma$$,abs)反応断面積の巨大共鳴領域における微細構造を0.1%という高分解能で測定した。20$$sim$$25MeVのエネルギー範囲で得られた測定データを示すとともに、従来の測定値との比較について議論した。

The characteristics of the nuclear photo-absorption spectroscopy using the laser Compton scattering (LCS) photons and the high-resolution high-energy photon spectrometer (HHS) are presented in this paper. The maximum energy of a LCS photon was increased up to 30 MeV, and the response functions of the HHS were improved. By taking advantage of these achievements, the $$^{16}$$O($$gamma$$,abs) cross section was measured in the giant resonance region, that is, 20 to 25 MeV. The preliminary result with the energy resolution of about 0.1% is presented and compared with the preceding data.

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