Roles of chiral three-nucleon forces in nucleon-nucleus scattering
Roles of chiral three-nucleon forces in nucleon-nucleus scattering
复制标题
手性三核子力在核子-核散射中的作用
DOI：
10.1088/0954-3899/42/2/025104
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and M. Yahiro
中科院分区：
文献类型：
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作者：
M. Toyokawa;K. Minomo;M. Kohno;and M. Yahiro
采用基于核物质的Brueckner-Hartree-Fock方法和核弹性散射的g矩阵折叠模型的标准框架，在NNLO水平上研究了手征三核子力对核子-核弹性散射的影响。由N3LO水平上的手征双核子力(2NF)计算的核物质光学势与Bonn-B2Nf近似，而墨尔本g-矩阵是通过局域化由Bonn-B2Nf计算的g-矩阵构造的实际有效核子-核子相互作用.作为估计手性-3Nf对NA散射影响的第一次尝试，通过将局部墨尔本g矩阵乘以由手性2Nf+3Nf计算的核物质光学势与手性2Nf计算的光学势之比，简单地介绍了手性-3Nf的影响。对于65 MeV的NA弹性散射，手性3Nf使折叠势的吸引力降低，吸收能力增强。虚部的新性质源于手性3Nf对张量关联的增强(主要是2π交换图)。在有实验数据的前角和中角，对于不同的截面和矢量分析功率，这两种影响都很小。如果进行反向测量，数据将揭示手性3nF的影响。
We investigate the effects of chiral three-nucleon force (3NF) at NNLO level on nucleon–nucleus (NA) elastic scattering, using the standard framework based on the Brueckner–Hartree–Fock method for nuclear matter and the g-matrix folding model for NA elastic scattering. The optical potential in nuclear matter calculated from chiral two-nucleon force (2NF) at N 3 LO level is found to be close to that from Bonn-B 2NF, whereas the Melbourne g-matrix is known as a practical effective nucleon–nucleon interaction constructed by localizing the g-matrices calculated from Bonn-B 2NF. As the first attempt to estimate chiral-3NF effects on NA scattering, the effects are simply introduced by multiplying the local Melbourne g-matrix by the ratio of the optical potential in nuclear matter calculated from chiral 2NF+ 3NF to that from chiral 2NF. For NA elastic scattering on various targets at 65 MeV, chiral 3NF makes the folding potential less attractive and more absorptive. The novel property for the imaginary part is originated in the enhancement of tensor correlations due to chiral 3NF (mainly the 2π-exchange diagram). The two effects are small for differential cross sections and vector analyzing powers at the forward and middle angles where the experimental data are available. If backward measurements are made, the data will reveal the effects of chiral 3NF.