发表机构
the University of Tokyo; Grand Accélérateur National d’Ions Lourds (GANIL); RIKEN Nishina Center; Tohoku University; Quark Nuclear Science Institute, the University of Tokyo; Université Paris-Saclay; Facility for Rare Isotope Beams, Michigan State University; Department of Physics and Astronomy, Michigan State University（东京大学; 大离子加速器国家中心; 理化学研究所仁科研究中心; 东北大学; 东京大学夸克核科学研究所; 巴黎萨克雷大学; 密歇根州立大学稀有同位素束流设施; 密歇根州立大学物理与天文学系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过统一条件下的 $(p,d)$ 反应精确测定中子缺失 $p$ 壳核的谱因子，发现其与壳模型计算值之比随分离能不对称性增加而略微下降，为短程关联研究提供高精度基准。
AI 中文摘要
我们报道了在中子缺失 $p$ 壳核 $^{12}\mathrm{C}$、$^{10}\mathrm{C}$、$^{9}\mathrm{C}$ 和 $^{8}\mathrm{B}$ 中中子移除谱因子的不确定性受控测定，所有测量均在统一条件下通过 GANIL/LISE 装置液氢靶上约 50 MeV/核子的独占基态到基态 $(p,d)$ 反应进行。氘核由位于前向角度的高分割 MUST2 探测器探测，激发能通过缺失质量方法重建。观测到多个跃迁，包括 $^7\mathrm{B}$ 中的一个新态。对所有核均呈现 $L=1$ 模式的微分截面，用 416 组不确定性量化的光学模型势参数并考虑各种单粒子束缚态波函数进行拟合，以推导 $C^2S$ 值。实验值与壳模型计算值之比 $R_S$ 被发现随着质子与中子分离能不对称性 $\Delta S$ 的增加而略微下降，斜率为 $-0.0049(36)_{\rm stat}(13)_{\rm omp}(8)_{\rm s.p.}$。观测到的趋势与唯象预期相符，即短程关联对 $C^2S$ 的影响随核子少数程度增加而增强。当前数据集提供了高精度基准，将严格约束未来对非对称核中短程关联的微观描述。
英文摘要
We report an uncertainty-controlled determination of neutron-removal spectroscopic factors in the neutron-deficient $p$-shell nuclei $^{12}\mathrm{C}$, $^{10}\mathrm{C}$, $^{9}\mathrm{C}$, and $^{8}\mathrm{B}$, all measured under uniform conditions through exclusive ground-state-to-ground-state $(p,d)$ reactions at about 50 MeV/nucleon in a liquid hydrogen target at the GANIL/LISE facility. The deuterons were detected in the highly-segmented MUST2 detector placed at forward angles and the excitation energy was reconstructed by the missing mass method. Several transitions, including a new state in $^7\mathrm{B}$, were observed. Differential cross sections, which display an $L=1$ pattern for all nuclei, were fitted with 416 sets of uncertainty-quantified optical-model potential parameters and considering various single-particle bound-state wavefunctions to derive $C^2S$ values. The ratio between experimental and shell-model calculated values, $R_S$, is found to be slightly decreasing as a function of increasing proton to neutron separation energy asymmetry $ΔS$, with a slope of $-0.0049(36)_{\rm stat}(13)_{\rm omp}(8)_{\rm s.p.}$. The observed trend is compatible with the phenomenological expectation that the short-range correlation effect on $C^2S$ increases with the degree of nucleon minority. The present data set delivers a high-precision benchmark that will tightly constrain future microscopic descriptions of short-range correlations in asymmetric nuclei.
Comments6 pages, 3 figures, 1 table
