论文标题
质子弹性散射通过同位素分析探测的稳定S和Ni同位素的表面中子密度的变形影响
Deformation effects on the surface neutron densities of stable S and Ni isotopes probed by proton elastic scattering via isotopic analysis
论文作者
论文摘要
为了从320 MeV的质子弹性中提取结构信息，在$ e_p = 180 $ MEV处提取s同位素，Ni同位素的结构信息，本研究提出了将核结构和反应计算的同位素分析。在$^{48} $ ca和$^{50} $ ti上重复了等渗分析。结构计算是通过使用球形和变形的相对论hartree-bogoliubov（RHB）计算进行的，并进行了球形非派别的Skyrme Hartree-fock-Bogoliubov计算。假设靶核的理论密度，使用相对论脉冲近似（RIA）计算$（p，p）$反应。使用RHB计算获得的目标密度以及密度依赖性点耦合相互作用的RIA计算合理地重现了所研究的质量数区域中的$（P，P）$横截面。详细分析了核结构和$（p，p）$反应；特别是，阐明了变形对表面密度的同位素系统和$（p，p）$横截面的影响。发现变形效应对于描述实验$（p，p）$横截面的同位素系统学至关重要。总体而言，同位素和等渗分析可用于从质子散射中提取核结构信息，例如核变形和单粒子特征，从而使表面密度敏感探测。
To extract structure information from proton elastic scattering off S isotopes at 320 MeV and Ni isotopes at $E_p=180$ MeV, this study proposes isotopic analyses combining nuclear structure and reaction calculations. The isotonic analysis was repeated on $^{48}$Ca and $^{50}$Ti. The structure calculations were performed by using the spherical and deformed Relativistic Hartree--Bogoliubov (RHB) calculations, and the spherical nonrelativistic Skyrme Hartree--Fock--Bogoliubov calculations. The $(p,p)$ reactions were calculated using the relativistic impulse approximation (RIA) assuming the theoretical densities of target nuclei. The RIA calculations using the target densities obtained by the RHB calculation, along with the density-dependent point-coupling interactions reasonably reproduced the $(p,p)$ cross sections in the studied mass number region. The nuclear structure and $(p,p)$ reactions were analyzed in detail; especially, the effects of deformation on the isotopic systematics of the surface densities and $(p,p)$ cross sections were clarified. The deformation effects were found to be essential to describe the isotopic systematics of the experimental $(p,p)$ cross sections. Overall, isotopic and isotonic analyses are useful for extracting the nuclear structure information such as nuclear deformations and single-particle features from proton scattering, enabling sensitive probing of surface densities.
