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Striking behavior of photoneutron cross sections for $$^{90}$$Zr near threshold

$$^{90}$$Zrの閾値近傍における光核反応断面積の特異な振る舞い

宇都宮 弘章*; Goriely, S.*; 秋宗 秀俊*; 山形 民穂*; 近藤 壮雄*; 岩本 ちひろ*; 伊藤 修*; 鎌田 正輝*; 井尾 雅則*; 楠瀬 幸一*; 寺元 多可志*; 原田 秀郎 ; 北谷 文人; 後神 進史*; 豊川 弘之*; 山田 家和勝*; Lui, Y.-W.*

Utsunomiya, Hiroaki*; Goriely, S.*; Akimune, Hidetoshi*; Yamagata, Tamio*; Kondo, Takeo*; Iwamoto, Chihiro*; Ito, Osamu*; Kamata, Masaki*; Io, Masanori*; Kususe, Koichi*; Teramoto, Takashi*; Harada, Hideo; Kitatani, Fumito; Goko, Shinji*; Toyokawa, Hiroyuki*; Yamada, Kawakatsu*; Lui, Y.-W.*

Photoneutron cross sections for $$^{90}$$Zr near neutron threshold were examined with a photon difference technique using laser Compton scattering $$gamma$$-ray beams. The cross section decreasing in the vicinity of neutron threshold exhibited a steep rise within 150 keV above the threshold. We draw attention to a possible relation of this striking behavior to the 3P valence neutron resonance known in neutron capture in the mass region A $$approx$$ 90.

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