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Partial photoneutron cross sections for $$^{207,208}$$Pb

$$^{207,208}$$Pbの部分光中性子断面積

近藤 壮雄*; 宇都宮 弘章*; Goriely, S.*; 岩本 ちひろ*; 秋宗 秀俊*; 山形 民穂*; 豊川 弘之*; 原田 秀郎 ; 北谷 文人; Lui, Y.-W.*; Hilaire, S.*; Koning, A. J.*

Kondo, Takeo*; Utsunomiya, Hiroaki*; Goriely, S.*; Iwamoto, Chihiro*; Akimune, Hidetoshi*; Yamagata, Tamio*; Toyokawa, Hiroyuki*; Harada, Hideo; Kitatani, Fumito; Lui, Y.-W.*; Hilaire, S.*; Koning, A. J.*

Using linearly-polarized laser-Compton scattering $$gamma$$-rays, partial E1 and M1 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. Separately, total photoneutron cross sections were measured for $$^{207,208}$$Pb with a high-efficiency 4$$pi$$ neutron detector. The partial cross section measurement provides direct evidence for the presence of pygmy dipole resonance (PDR) in $$^{207,208}$$Pb near the neutron threshold. The strength of PDR amounts to 0.32% - 0.42% of the Thomas-Reiche-Kuhn sum rule. Several $$mu$$$$^{2}$$$$_{N}$$ units of B(M1)$$uparrow$$ strength were observed in $$^{207,208}$$Pb just above neutron threshold, which correspond to M1 cross sections less than 10% of the total photoneutron cross sections.

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パーセンタイル:85.28

分野:Physics, Nuclear

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