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arXiv 2109.13699nucl-th
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基于精确库仑波函数的光的光学势参数nuclear fusion

Optical potential parameters of light nuclear fusion based on precise Coulomb wave functions

Binbing Wu, Hao Duan, Jie Liu

摘要:

基于精确的库仑波函数(CWF),我们试图计算轻核在复杂球形方势阱中的熔合截面(即,光学势模型)。通过与实验基准截面数据的比较,标定了D+D、D+T、D+3He、p+D、p+6Li和p+7Li聚变反应的光学势参数。令人惊讶的是,我们发现我们计算的光学势参数与许多以前的结果(例如,Phys. Rev. C. 61(2000)024610,Nucl.Phys.A986(2019)98等),其中近似库仑波函数(ACWF)只保留了核势半径处的连续性条件。此外,利用所得到的光学势参数,我们还将聚变反应的截面和天体物理S因子与ACWFs方法的结果进行了比较,发现对于具有共振峰的聚变反应(如D+T和D+3He聚变反应)存在明显的偏差.然后,我们计算了熔合截面相对于光学势参数的相图,并展示了几个窄形状的共振带。这意味着在原子核半径处,ACWF与精确CWFs的微小偏差可能导致共振区的偏离,从而导致光学参数和截面的巨大差异。

英文摘要:

Based on precise Coulomb wave functions (CWFs), we attempt to calculate the fusion cross sections of light nuclei in a complex spherical square-well nuclear potential (i.e., optical potential model). Comparing with experimental benchmark cross section data, we can calibrate optical potential parameters associated with D+D, D+T, D+3He, p+D, p+6Li and p+7Li fusion reactions. Surprisingly, we find that our calculated optical potential parameters are quite different from those of many previous results (e.g., Phys. Rev. C. 61 (2000) 024610, Nucl. Phys. A 986 (2019) 98, etc.), in which approximate Coulomb wave functions (ACWFs) with only retaining the leading terms are exploited for the continuity conditions at the radius of nuclear potential. Furthermore, with the obtained optical potential parameters, we compare the fusion cross sections and astrophysical S-factors with that formulated from ACWFs approach, and also find apparent deviations especially for the fusion reactions with resonance peaks such as D+T and D+3He fusion reactions. We then calculate the phase diagrams of the fusion cross sections with respect to the optical potential parameters and demonstrate several narrow shape resonance belts. It implies that a small deviation of ACWFs from the exact CWFs at nuclear radius might lead to fall off the resonance regimes and therefore causes the big difference on the optical parameters as well as the cross sections.

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