arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.06257nucl-th
收藏

$^{3}$ He散射的微观研究

A microscopic approach to $^{3}$He scattering

Masakazu Toyokawa, Takuma Matsumoto, Kosho Minomo, Masanobu Yahiro

摘要:

我们提出了一个实用的折叠模型来描述$^{3}$ He弹性散射。在该模型中,通过两次折叠过程构造了$^{3}$ He光学势.首先用靶密度折叠Melbourne $g$ -矩阵,用Brieva-Rook方法定域非定域折叠势,然后用$^{3}$ He密度折叠得到的定域核子-靶势.这个双单折叠模型很好地描述了入射能量从30 MeV/核子到150 MeV/核子的宽范围内$^{3}$ He与$^{58}$ Ni和$^{208}$ Pb靶的弹性散射,没有可调参数。自旋-轨道力对微分截面的影响仅在较高的入射能量下(如150 MeV/核子)才明显。用连续离散耦合道方法研究了$^{3}$ He的三核子分裂效应,发现只有在40 MeV/核子附近的较低入射能量下才有明显的三核子分裂效应.还分析了撞击交换过程的影响。

英文摘要:

We propose a practical folding model to describe $^{3}$He elastic scattering. In the model, $^{3}$He optical potentials are constructed by making the folding procedure twice. First the nucleon-target potential is evaluated by folding the Melbourne $g$-matrix with the target density and localizing the nonlocal folding potential with the Brieva--Rook method, and second the resulting local nucleon-target potential is folded with the $^{3}$He density. This double single-folding model well describes $^{3}$He elastic scattering from $^{58}$Ni and $^{208}$Pb targets in a wide incident-energy range from 30 MeV/nucleon to 150 MeV/nucleon with no adjustable parameter. Spin-orbit force effects on differential cross sections are found to be appreciable only at higher incident energies such as 150 MeV/nucleon. Three-nucleon breakup effects of $^{3}$He are investigated with the continuum discretized coupled-channels method and are found to be appreciable only at lower incident energies around 40 MeV/nucleon. Effects of knock-on exchange processes are also analyzed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑