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Nucleon direct-semidirect radiative capture with Skyrme-Hartree-Fock-BCS bound states

スキルムハートリーフォックの束縛状態を用いる核子の直接及び半直接放射捕獲

Bonearu, L.*; 河野 俊彦*; 渡邊 健人*; 千葉 敏

Bonearu, L.*; Kawano, Toshihiko*; Watanabe, Takehito*; Chiba, Satoshi

核子の直接及び半直接捕獲反応(DSD)断面積をハートリーフォックBCS束縛状態への遷移として計算した。変形核に対しては一粒子状態を軸対称の調和振動子基底で展開し、球対称基底に射影することにより求めた。対相関はBCS理論に基づき、スペクトロスコピック因子の計算値は$$^{116}$$Snから$$^{124}$$Snに対して測定値をよく再現した。$$^{208}$$Pbと$$^{238}$$Uの中性子DSD捕獲断面積は測定値と良く一致した。r過程で重要な$$^{122}$$Snと$$^{132}$$Snについての計算も行った。

The nucleon direct-semidirect (DSD) capture cross sections are obtained by calculating a transition amplitude to the Hartree-Fock-BCS bound states. The radial matrix elements in the DSD amplitudes are calculated from the radial part of the single-particle wave functions. For deformed nuclei the single-particle states are expanded in the cylindrical harmonic-oscillator basis and then projected on the spherical harmonic-oscillator basis. The pairing correlations are treated in the BCS approach and the calculated spectroscopic factors are in fairly good agreement with experimental data in the even tin isotopes from $$^{116}$$Sn to $$^{124}$$Sn. The resulting DSD cross sections for the neutron capture by $$^{208}$$Pb and $$^{238}$$U are found to be in good agreement with the available experimental data. The calculations are also performed for the neutron capture on $$^{122}$$Sn and $$^{132}$$Sn isotopes that are important for ther-process in astrophysics.

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パーセンタイル:21.27

分野:Physics, Nuclear

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