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論文

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

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

https://doi.org/10.1016/j.nds.2014.08.085
 被引用回数：1 パーセンタイル：85.28(Physics, Nuclear)

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.

論文

Photoneutron cross sections for Mo isotopes; A Step toward a unified understanding of($$gamma$$,n) and (n,$$gamma$$)reactions

宇都宮 弘章*; Goriely, S.*; 近藤 壮雄*; 岩本 ちひろ*; 秋宗 秀俊*; 山県 民穂*; 豊川 弘之*; 原田 秀郎; 北谷 文人; Lui, Y.-W.*; et al.

Physical Review C, 88(1), p.015805_1 - 015805_6, 2013/07

https://doi.org/10.1103/PhysRevC.88.015805
 被引用回数：38 パーセンタイル：5.5(Physics, Nuclear)

Photoneutron cross sections were measured for $$^{94}$$Mo,$$^{95}$$Mo,$$^{96}$$Mo, $$^{97}$$Mo,$$^{98}$$Mo, and $$^{100}$$Mo near the neutron threshold with quasi-monochromatic laser-Compton scattering $$gamma$$-rays. The photoneutron data were analyzed with the Skyrme Hartree-Fock-Bogoliubov (HFB) plus quasiparticle random phase approximation (QRPA) model and the axially-symmetric-deformed Gogny HFB plus QRPA model of E1 $$gamma$$-ray strength. Combining the $$gamma$$-ray strength function constrained by the present photoneutron data with either the nuclear resonance fluorescence data or the updated Oslo data to supplement the data below the neutron threshold, a thorough analysis of the reverse (n,$$gamma$$) cross sections is made whenever measurements are available. The Oslo data and the corresponding uncertainties are updated based on the latest results of the s-wave neutron spacing and the average radiative width determined in particular for $$^{96}$$Mo.

論文

$$gamma$$-ray strength function method; A Way from photoneutron emission to radiative neutron capture

宇都宮 弘章*; 秋宗 秀俊*; 山県 民穂*; 岩本 ちひろ*; Goriely, S.*; Daoutidis, I.*; 豊川 弘之*; 原田 秀郎; 北谷 文人; 岩本 信之; et al.

Proceedings of 14th International Symposium on Capture $$gamma$$-Ray Spectroscopy and Related Topics, p.505 - 514, 2013/05

Radiative neutron capture cross section are of direct relevance for the synthesis of heavy elements referred to as the s-process and the r-process in nuclear astrophysics and constitute basic data in the field of nuclear engineering. The surrogate reaction technique is in active use to indirectly determine radiative neutron capture cross sections for unstable nuclei. We have devised an indirect method alternative to the surrogate reaction technique on the basis of the $$gamma$$-ray strength function ($$gamma$$-SF), a nuclear statistical quantity that interconnects photoneutron emission and radiative neutron capture in Hauser-Feshbach model calculation. The primary strength of the $$gamma$$-SF is low-energy E1 strength in the tail of GDR. We outline the $$gamma$$-SF method and show application of the method to Zr, Pd and Sn isotopes. In the application of the $$gamma$$-SF method, it is important to use $$gamma$$-SF, which incorporates extra strengths of PDR and/or M1 resonance emerging around neutron threshold.

論文

Total and partial photoneutron cross sections for Pb isotopes

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*; et al.

Physical Review C, 86(1), p.014316_1 - 014316_7, 2012/07

https://doi.org/10.1103/PhysRevC.86.014316
 被引用回数：26 パーセンタイル：13.83(Physics, Nuclear)

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。

論文

Photoneutron cross sections for $$^{118-124}$$Sn and the $$gamma$$-ray strength function method

宇都宮 弘章*; Goriely, S.*; 鎌田 正輝*; 秋宗 秀俊*; 近藤 壮雄*; 伊藤 修*; 岩本 ちひろ*; 山県 民穂*; 豊川 弘之*; Lui, Y.-W.*; et al.

Physical Review C, 84(5), p.055805_1 - 055805_6, 2011/11

https://doi.org/10.1103/PhysRevC.84.055805
 被引用回数：31 パーセンタイル：10.37(Physics, Nuclear)

$$^{118}$$Sn, $$^{119}$$Sn, $$^{120}$$Sn, $$^{122}$$Sn、及び$$^{124}$$Snに対し、中性子閾値近傍の光核反応断面積を準単色レーザ逆コンプトン光を用いて測定した。得られた測定データと既存の中性子捕獲データを、ピグミー共鳴を電磁双極子励起モードに組み込んだ計算コードにより系統的に解析した。本手法、いわゆる、$$gamma$$線強度関数法を適用することにより、放射性核種$$^{121}$$Sn及び$$^{123}$$Snの中性子捕獲断面積を導出した。

論文

The $$gamma$$SF method

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

https://doi.org/10.1063/1.3628388
 パーセンタイル：100

The $$gamma$$-ray strength function ($$gamma$$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 $$gamma$$-ray strength function. Application examples of the $$gamma$$SF method are demonstrated.

論文

Application of the $$gamma$$SF method to palladium

宇都宮 弘章*; Goriely, S.*; Arteaga, D. P.*; Daoutidis, I.*; 秋宗 秀俊*; 山県 民穂*; 近藤 壮雄*; 岩本 ちひろ*; 鎌田 正輝*; 伊藤 修*; et al.

AIP Conference Proceedings 1377, p.450 - 452, 2011/10

https://doi.org/10.1063/1.3628442
 パーセンタイル：100

Photoneutron cross sections were measured for $$^{108}$$Pd, $$^{106}$$Pd, and $$^{105}$$Pd with laser-Compton scattering $$gamma$$-ray beams in an application of the $$gamma$$SF method to a radioactive nucleus $$^{107}$$Pd. We present radiative neutron cross sections for $$^{107}$$Pd [6.5$$times$$10$$^{6}$$ y] obtained with the $$gamma$$SF method.

論文

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

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

https://doi.org/10.1063/1.3628441
 パーセンタイル：100

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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