sd壳层中质子晕的动量分布与空间特征
Momentum Distributions and Spatial Signatures of Proton Halos in the sd Shell
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中文总结 AI 辅助
本研究通过理论计算多类可观测量，发现需结合动量分布、空间特征等多因素才能可靠识别质子晕，明确了sd壳层中26P、27S等核的质子晕相关特征。
中文摘要 AI 辅助
我们对质子靶上的中能准自由单质子敲出反应开展理论研究，采用受实验质子分离能约束的单粒子波函数，计算了26P、27S和31Ar核的纵向动量分布、单质子去除截面及完整动量空间分布。为建立识别质子晕的可靠判据，分析超出传统动量宽度方法，通过均方根半径及质子位于核心核外的概率P(r>R_core)探究价质子的空间延展，还考察了库仑势垒系统学、镜像核对比、真实谱学混合、有限实验动量分辨率及质子分离能相关不确定性。计算表明，无法从单一可观测量可靠识别质子晕结构，仅当同时考虑动量分布、空间可观测量、库仑效应及多体结构时才能得到一致解释。在当前模型内，26P表现出最强的质子晕特征，27S尽管库仑势垒更大仍保留明显的类晕特征，束缚更强的31Ar提供了有用对比，阐明了随结合能和核心电荷增加，晕可观测量逐步被抑制的规律。
英文摘要
We perform a theoretical study of intermediate-energy quasifree one-proton knockout reactions on proton targets. Single-particle wave functions constrained by the experimental proton separation energies are employed to calculate longitudinal momentum distributions, one-proton removal cross sections, and full momentum-space profiles for $^{26}$P, $^{27}$S and $^{31}$Ar nuclei. To establish robust criteria to identify proton halos, the analysis is extended beyond the traditional momentum-width approach by investigating the spatial extension of the valence proton through root-mean-square radii and the probability that the proton resides outside the core nucleus, $P(r>R_{\rm core})$. We also examine Coulomb-barrier systematics, mirror-nucleus comparisons, realistic spectroscopic mixtures, finite experimental momentum resolution, and uncertainties associated with the proton separation energy. Our calculations indicate that proton-halo structure cannot be identified reliably from a single observable. A consistent interpretation emerges only when momentum distributions, spatial observables, Coulomb effects, and many-body structure are considered simultaneously. Within the present model, $^{26}$P exhibits the strongest proton-halo signatures, while $^{27}$S retains pronounced halo-like features despite its larger Coulomb barrier. The more strongly confined $^{31}$Ar provides a useful comparison and illustrates the progressive suppression of halo observables with increasing binding and core charge.
发表机构
- East Texas A&M University（东德克萨斯农工大学）
- Technische Universität Darmstadt（达姆施塔特工业大学）
- Centro Brasileiro de Pesquisas Físicas（巴西物理研究中心）
机构由 AI 辅助整理，请以论文原文为准。
