Asymmetry dependence of nucleon correlations in spherical nuclei extracted from a dispersive-optical-model analysis
Asymmetry dependence of nucleon correlations in spherical nuclei extracted from a dispersive-optical-model analysis
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从色散光学模型分析中提取的球形核中核子相关性的不对称依赖性
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
R. Pedroni
中科院分区：
文献类型：
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作者：
Jonathan Mueller;R. Charity;R. Shane;L. Sobotka;S. Waldecker;W. H. Dickhoff;A. Crowell;J. Esterline;B. Fallin;C. Howell;C. Westerfeldt;M. Youngs;B. Crowe;R. Pedroni
在束流能量为11.9和16.9 MeV时，测量了40，48 Ca靶上的中子弹性散射角分布。这些数据加上其他弹性散射测量，总截面和反应截面测量，（e，ep）数据，以及幻核和双幻核的单粒子能量已经在色散光学模型（DOM）中进行了分析，产生核子自能（光学模型势），可以通过多体戴森方程与光谱因子和占据概率相关。结果表明，对于稳定核，质子的虚表面势与中子-质子不对称性有很强的相关性。这一结果导致光谱因子对不对称性的更适度的依赖性。所有考虑的核的测量数据和DOM分析清楚地表明，中子虚表面势显示非常小的依赖于近稳定核（N Z）的中子质子不对称性。
Neutron elastic-scattering angular distributions were measured at beam energies of 11.9 and 16.9 MeV on 40,48 Ca targets. These data plus other elastic-scattering measurements, total and reaction cross-sections measurements, (e, ep) data, and single-particle energies for magic and doubly magic nuclei have been analyzed in the dispersive optical-model (DOM), generating nucleon self-energies (optical-model potentials) that can be related, via the many-body Dyson equation, to spectroscopic factors and occupation probabilities. It is found that, for stable nuclei with N Z, the imaginary surface potential for protons exhibits a strong dependence on the neutron-proton asymmetry. This result leads to a more modest dependence of the spectroscopic factors on asymmetry. The measured data and the DOM analysis of all considered nuclei clearly demonstrate that the neutron imaginary surface potential displays very little dependence on the neutron-proton asymmetry for nuclei near stability (N Z).