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Neutron-hole states in $$^{131}$$Sn and spin-orbit splitting in neutron-rich nuclei

$$^{131}$$Snの中性子空孔状態と中性子過剰核のスピン軌道分離エネルギー

Orlandi, R.; Pain, S. D.*; Ahn, S.*; Jungclaus, A.*; Schmitt, K. T.*; Bardayan, D. W.*; Catford, W. N.*; Chapman, R.*; Chipps, K. A.*; Cizewski, J. A.*; Gross, C. G.*; Howard, M. E.*; Jones, K. L.*; Kozub, R. L.*; Manning, B.*; Matos, M.*; 西尾 勝久; O' Malley, P. D.*; Peters, W. A.*; Pittman, S. T.*; Ratkiewicz, A.*; Shand, C.*; Smith, J. F.*; Smith, M. S.*; 福井 徳朗*; Tostevin, J. A.*; 宇都野 穣

Orlandi, R.; Pain, S. D.*; Ahn, S.*; Jungclaus, A.*; Schmitt, K. T.*; Bardayan, D. W.*; Catford, W. N.*; Chapman, R.*; Chipps, K. A.*; Cizewski, J. A.*; Gross, C. G.*; Howard, M. E.*; Jones, K. L.*; Kozub, R. L.*; Manning, B.*; Matos, M.*; Nishio, Katsuhisa; O' Malley, P. D.*; Peters, W. A.*; Pittman, S. T.*; Ratkiewicz, A.*; Shand, C.*; Smith, J. F.*; Smith, M. S.*; Fukui, Tokuro*; Tostevin, J. A.*; Utsuno, Yutaka

Low-lying neutron-hole states in $$^{131}$$Sn were populated via the $$^{132}$$Sn(d,t) reaction at Oak Ridge National Laboratory. The triton angular distributions were compared to DWBA calculations and revealed spectroscopic factors compatible with a single-hole nature of the states populated. The data permit to determine the spin-orbit splitting of the strongly bound $$d_{3/2}$$ and $$d_{5/2}$$ neutron orbits below the shell gap, which was compared to the splitting of the weakly bound 3$$p$$ and 2$$f$$ orbits above the gap. The comparison revealed a smaller energy splitting of the 3$$p$$ orbits. All splittings were reproduced using Woods-Saxon calculations, and the lower splitting of the 3$$p$$ orbits was explained to arise from the large radial extent of the wavefunction and small value of the amplitude at the surface. This result is important to understand at a fundamental level the spin-orbit interaction, and its effects on neutron-rich nuclei.

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パーセンタイル:49.68

分野:Astronomy & Astrophysics

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