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arXiv 1806.01037nucl-th
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质子-核弹性散射:唯象光学势与微观光学势的比较

Proton-Nucleus Elastic Scattering: Comparison between Phenomenological and Microscopic Optical Potentials

Matteo Vorabbi, Paolo Finelli, Carlotta Giusti

摘要:

弹性散射是理解有限核中核相互作用的一个非常重要的过程。尽管经过几十年的努力,但从微观力的角度对这一物理过程进行连贯描述的目标仍然远远没有完成。在以前的论文(Phys. Rev. C93,034619(2016),Phys. Rev. C96,044001(2017))中,我们从四阶(N3 LO)和五阶(N4 LO)的核子-核子手征势导出了非相对论性理论光学势。我们检查收敛模式,并建立理论误差带。通过这项工作,我们研究了我们的光学势的性能与那些成功的非相对论性唯象光学势的描述的弹性质子散射数据在几个同位素链的能量在200 MeV左右和以上。我们使用与我们以前的论文相同的框架和近似,其中非相对论光学势是在多次散射理论的旁观者展开中的一阶项处导出的,并采用脉冲近似和最佳因子分解近似。弹性质子散射钙,镍,锡,铅同位素的横截面和分析能力,提出了几个入射质子能量,探索范围$156 \le E \le 333$兆电子伏,实验数据可用。此外,我们提供的理论预测Ni 56在400 MeV,这是在EXL的未来实验的兴趣。我们的结果表明,微观光学势来自核子-核子手征势在N4 LO可以提供可靠的预测的截面和分析能力的稳定和奇异核,即使在能量的手征展开的可靠性开始受到质疑。

英文摘要:

Elastic scattering is a very important process to understand nuclear interactions in finite nuclei. Despite decades of efforts, the goal of reaching a coherent description of this physical process in terms of microscopic forces is still far from being completed. In previous papers (Phys. Rev. C93, 034619 (2016), Phys. Rev. C96, 044001 (2017)) we derived a nonrelativistic theoretical optical potential from nucleon-nucleon chiral potentials at fourth (N3LO) and fifth order (N4LO). We checked convergence patterns and established theoretical error bands. With this work we study the performances of our optical potential in comparison with those of a successful nonrelativistic phenomenological optical potential in the description of elastic proton scattering data on several isotopic chains at energies around and above 200 MeV. We use the same framework and the same approximations of our previous papers, where the nonrelativistic optical potential is derived at the first-order term within the spectator expansion of the multiple scattering theory and adopting the impulse approximation and the optimum factorization approximation. The cross sections and analyzing powers for elastic proton scattering off calcium, nickel, tin, and lead isotopes are presented for several incident proton energies, exploring the range $156 \le E \le 333$ MeV, where experimental data are available. In addition, we provide theoretical predictions for Ni56 at 400 MeV, which is of interest for the future experiments at EXL. Our results indicate that microscopic optical potentials derived from nucleon-nucleon chiral potentials at N4LO can provide reliable predictions for the cross section and the analyzing power both of stable and exotic nuclei, even at energies where the reliability of the chiral expansion starts to be questionable.

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。

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