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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.*; et al.
Nuclear Data Sheets, 119, p.310 - 313, 2014/05
被引用回数:2 パーセンタイル:19.09(Physics, Nuclear)Using linearly-polarized laser-Compton scattering -rays, partial E1 and M1 photoneutron cross sections along with total cross sections were determined for Pb at four energies near threshold by measuring anisotropies in photoneutron emission. Separately, total photoneutron cross sections were measured for Pb with a high-efficiency 4 neutron detector. The partial cross section measurement provides direct evidence for the presence of pygmy dipole resonance (PDR) in Pb near the neutron threshold. The strength of PDR amounts to 0.32% - 0.42% of the Thomas-Reiche-Kuhn sum rule. Several units of B(M1) strength were observed in Pb just above neutron threshold, which correspond to M1 cross sections less than 10% of the total photoneutron cross sections.
宇都宮 弘章*; Goriely, S.*; 秋宗 秀俊*; 山形 民穂*; 近藤 壮雄*; 岩本 ちひろ*; 岡本 明之*; 原田 秀郎; 北谷 文人; 後神 進史*; et al.
AIP Conference Proceedings 1377, p.255 - 259, 2011/10
被引用回数:0 パーセンタイル:0.05(Astronomy & Astrophysics)The -ray strength function (SF) interconnects radiative neutron capture and photoneutron emission as a common ingredient in the statistical model. Outlined here is an indirect method of determining radiative neutron-capture cross sections for unstable nuclei based on the -ray strength function. Application examples of the SF method are demonstrated.
伊藤 修*; 宇都宮 弘章*; 秋宗 秀俊*; 山形 民穂*; 近藤 壮雄*; 鎌田 正輝*; 豊川 弘之*; 原田 秀郎; 北谷 文人; 後神 進史*; et al.
AIP Conference Proceedings 1377, p.362 - 364, 2011/10
被引用回数:0 パーセンタイル:0.05(Astronomy & Astrophysics)Photoneutron cross sections were measured for Au in the entire energy range of the (,n) channel based on a direct neutron-counting technique with quasimonochromatic rays produced in inverse Compton-scattering of laser photons with relativistic electrons. We present results of the measurement in comparison with the past data.
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*; et al.
AIP Conference Proceedings 1377, p.447 - 449, 2010/10
被引用回数:0 パーセンタイル:0.05(Astronomy & Astrophysics)Photoneutron cross sections for Zr near neutron threshold were examined with a photon difference technique using laser Compton scattering -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 90.