Effect of repulsive and attractive three-body forces on nucleus-nucleus elastic scattering
Effect of repulsive and attractive three-body forces on nucleus-nucleus elastic scattering
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DOI：
10.1103/physrevc.80.044614
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发表时间：
2009-10
影响因子：
3.1
通讯作者：
T. Furumoto;Y. Sakuragi;Y. Yamamoto
中科院分区：
文献类型：
--
作者：
T. Furumoto;Y. Sakuragi;Y. Yamamoto
根据核子-核子(NN)有效相互作用(复G矩阵)的Brueckner理论，研究了核-核弹性散射中的三体力效应。作者最近提出的一种新的G矩阵CEG07计入了TBF效应，再现了核物质中真实的饱和曲线，并很好地再现了质子-核的弹性散射。通过折叠具有碰撞核中核子密度分布的G矩阵，得到了核-核系统的微观光学势。我们首先详细分析了E/A=70 MeV时{sup 16}O+{sup 16}O的弹性散射。只有在计入TBF效应的情况下，观测到的截面才能很好地再现到最大后向散射角。冻结密度近似(FDA)的使用对于正确估计TBF在核-核散射中的影响是至关重要的。其他用于定义局部密度的处方也进行了测试，但只有FDA的处方正确地描述了实验横截面以及TBF的影响。还分析了三体引力和{omega}重排项的影响。将CEG07相互作用与CDM3Y6相互作用进行了比较，CDM3Y6是一种更可靠和成功的双折叠模型中使用的有效的密度依赖的NN相互作用。在E/A=93.9 MeV，{sup 12}C，{sup 28}Si，{sup 40}Ca靶对{sup 16}O的弹性散射和在E/A=135 MeV，{sup 12}C靶对{sup 12}C的弹性散射中，也成功地测试了CEG07 G矩阵。在这些系统中也清楚地看到了全面预算框架的决定性作用。最后，我们对{sup 16}O+{sup 16}O体系在不同能量下的CEG07a、CEG07b和CEG07c进行了测试。
The effect of the three-body force (TBF) is studied in nucleus-nucleus elastic scattering on the basis of Brueckner theory for nucleon-nucleon (NN) effective interaction (complex G matrix) in the nuclear matter. A new G matrix called CEG07 proposed recently by the present authors includes the TBF effect and reproduces a realistic saturation curve in the nuclear matter, and it is shown to well reproduce proton-nucleus elastic scattering. The microscopic optical potential for the nucleus-nucleus system is obtained by folding the G matrix with nucleon density distributions in colliding nuclei. We first analyze in detail the {sup 16}O+{sup 16}O elastic scattering at E/A=70 MeV. The observed cross sections are nicely reproduced up to the most backward scattering angles only when the TBF effect is included. The use of the frozen-density approximation (FDA) is essentially important to properly estimate the effect of the TBF in nucleus-nucleus scattering. Other prescriptions for defining the local density have also been tested, but only the FDA prescription gives a proper description of the experimental cross sections as well as the effect of the TBF. The effects of the three-body attraction and the {omega}-rearrangement term are also analyzed. The CEG07 interaction is compared with CDM3Y6, which ismore » a reliable and successful effective density-dependent NN interaction used in the double-folding model. The CEG07 G matrix is also tested in the elastic scattering of {sup 16}O by the {sup 12}C, {sup 28}Si, and {sup 40}Ca targets at E/A=93.9 MeV, and in the elastic scattering of {sup 12}C by the {sup 12}C target at E/A=135 MeV with great success. The decisive effect of the TBF is clearly seen also in those systems. Finally, we have tested CEG07a, CEG07b, and CEG07c for the {sup 16}O+{sup 16}O system at various energies.« less