arXiv 1603.024512016-03-08nucl-thnucl-ex

$K^+$ -来自$K^+$ -核子振幅的核电位

$K^+$-nucleus potentials from $K^+$-nucleon amplitudes

E. Friedman

备注：: 15 pages, 6 figures, to appear in Nucl. Phys. A
发表信息：: Nucl. Phys. A 954 (2016) 114-124
DOI：: 10.1016/j.nuclphysa.2016.02.053

摘要：

基于核介质中的$K^+$ -N运动学，利用最近发展起来的算法，由$K^+$ -核子振幅构造了$K^+$ -核相互作用的光学势.随着$K^+$介子以低于800~MeV/c的动量深入到核中，有可能以比迄今为止用$K^-$和π介子所做的更高的灵敏度来测试这种方法。实验反应和总截面对原子核的能量依赖性与固定的能量振幅相比，这种方法更好地再现。在介质中加入泡利关联也提高了计算与实验的一致性。对于$^6$ Li，截面的绝对标度被很好地再现，但对于C、Si和Ca，计算的截面比实验小（23 $\pm4$）%，与早期的分析一致。产生这种强度缺失的两种唯象模型表明，势的虚部需要大约40%的增强。

英文摘要：

Optical potentials for $K^+$-nucleus interactions are constructed from $K^+$-nucleon amplitudes using recently developed algorithm based on $K^+$-N kinematics in the nuclear medium. With the deep penetration of $K^+$ mesons into the nucleus at momenta below 800~MeV/c it is possible to test this approach with greater sensitivity than hitherto done with $K^-$ and pions. The energy-dependence of experimental reaction and total cross sections on nuclei is better reproduced with this approach compared to fixed-energy amplitudes. The inclusion of Pauli correlations in the medium also improves the agreement between calculation and experiment. The absolute scale of the cross sections is reproduced very well for $^6$Li but for C, Si and Ca calculated cross sections are (23$\pm4$)\% smaller than experiment, in agreement with earlier analyses. Two phenomenological models that produce such missing strength suggest that the imaginary part of the potential needs about 40\% enhancement.

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