论文标题
中子$ 3S_ {1/2} $使用质子散射的同位素分析在295 MEV时研究了稳定的锡同位素的职业变化
Neutron $3s_{1/2}$ occupation change across the stable tin isotopes investigated using isotopic analysis of proton scattering at 295 MeV
论文作者
论文摘要
通过组合核结构和反应计算，以分析295 MeV的核结构和反应计算，研究了A = 116--124的SN同位素的同位素系统。 SN（P，P）反应是通过相对论的相对密度使用相对论Hartree-Hartree-Bogoliubov（RHB）计算的SN同位素的理论密度来计算的。使用DD-ME2密度的计算重现了$^{122} $ sn（p，p）的实验数据，但高估了$^{116} $ sn（p，p，p，p）和$^{118} $ sn（p，p，p，p），向后角。在对横截面比率$ r（σ）$ $^{122} $ sn到$^{116} $ sn的同位素分析中，使用SKM*密度的计算重现了从实验横截面中获得的$ r（σ）$的峰值振幅，而使用DD-ME2 d dd Menterive则进行了计算。发现比率$ r（σ）$对中子$ 3S_ {1/2} $职业的同位素变化敏感，这是通过表面中子密度的同位素差a = 4--5 fm的同位素差。同位素分析表明，$ 3S_ {1/2} $职业从$^{116} $ sn到$^{122} $ sn，由DD-ME2计算获得。该结果来自295 MeV SN（P，P）横截面数据，与通过中子转移和拾取反应直接测量SN同位素中的中子职业。
The isotopic systematics of Sn isotopes in the range A=116--124 were investigated by combining the nuclear structure and reaction calculations for the analysis of Sn(p,p) reactions at 295 MeV. The Sn(p,p) reactions were calculated employing relativistic impulse approximation (RIA) with theoretical densities obtained for the Sn isotopes from relativistic Hartree-Bogoliubov (RHB) calculations with the DD-ME2 interaction and nonrelativistic Skyrme Hartree-Fock-Bogoliubov (SHFB) calculations with the SKM* interaction. Calculation using the DD-ME2 density reproduced the experimental data for $^{122}$Sn(p,p) but overestimated the $^{116}$Sn(p,p) and $^{118}$Sn(p,p) cross sections at backward angles. In the isotopic analysis of the cross section ratio $R(σ)$ of $^{122}$Sn to $^{116}$Sn, a calculation using the SKM* density reproduced the peak amplitudes of $R(σ)$ obtained from the experimental cross sections, whereas a calculation using the DD-ME2 density did not. The ratio $R(σ)$ was found to be sensitive to the isotopic change of the neutron $3s_{1/2}$ occupation through the isotopic difference of the surface neutron density around r=4--5 fm. Isotopic analysis indicated that a rapid increase of the $3s_{1/2}$ occupation from $^{116}$Sn to $^{122}$Sn obtained by the DD-ME2 calculation is unlikely. This result derived from the 295 MeV Sn(p,p) cross section data is consistent with the direct measurement of the neutron occupations in Sn isotopes by neutron transfer and pick-up reactions.
