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Total and partial photoneutron cross sections for Pb isotopes

Pb同位体の全及び部分光核反応断面積

近藤 壮雄*; 宇都宮 弘章*; Goriely, S.*; Daoutidis, I.*; 岩本 ちひろ*; 秋宗 秀俊*; 岡本 明之*; 山県 民穂*; 鎌田 正輝*; 伊藤 修*; 豊川 弘之*; Lui, Y.-W.*; 原田 秀郎 ; 北谷 文人; Hilaire, S.*; Koning, A. J.*

Kondo, Takeo*; Utsunomiya, Hiroaki*; Goriely, S.*; Daoutidis, I.*; Iwamoto, Chihiro*; Akimune, Hidetoshi*; Okamoto, Akiyuki*; Yamagata, Tamio*; Kamata, Masaki*; Ito, Osamu*; Toyokawa, Hiroyuki*; Lui, Y.-W.*; Harada, Hideo; Kitatani, Fumito; Hilaire, S.*; Koning, A. J.*

レーザ逆コンプトン$$gamma$$線と高検出効率4$$pi$$型中性子検出器を用いて、$$^{206,207,208}$$Pbの中性子閾値近傍における全光核反応断面積を測定した。また、直線偏光させた$$gamma$$線と中性子放出角の非等方性を測定することにより、$$^{207,208}$$Pbに対する$$E$$1及び$$M$$1励起による部分光核反応断面積を導出した。この結果、中性子閾値近傍においては$$E$$1励起が支配的であることなど$$gamma$$線強度関数に関する実験的知見を得た。

Using quasi-monochromatic laser-Compton scattering $$gamma$$ rays, total photoneutron cross sections were measured for $$^{206,207,208}$$Pb near neutron threshold with a high-efficiency 4$$pi$$ neutron detector. Partial $$E$$1 and $$M$$1 photoneutron cross sections along with total cross sections were determined for $$^{207,208}$$Pb at four energies near threshold by measuring anisotropies in photoneutron emission with linearly-polarized $$gamma$$ rays. The $$E$$1 strength dominates over the $$M$$1 strength in the neutron channel where $$E$$1 photoneutron cross sections show extra strength of the pygmy dipole resonance in $$^{207,208}$$Pb near the neutron threshold corresponding to 0.32-0.42% of the Thomas-Reiche-Kuhn sum rule. Several $$mu$$$$_N^{2}$$ units of B($$M$$1)$$uparrow$$ strength were observed in $$^{207,208}$$Pb just above neutron threshold, which correspond to an $$M$$1 cross section less than 10% of the total photoneutron cross section.

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パーセンタイル:13.83

分野:Physics, Nuclear

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