Single-neutron removal reactions from C-15 and Be-11: Deviations from the eikonal approximation
Single-neutron removal reactions from C-15 and Be-11: Deviations from the eikonal approximation
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C-15 和 Be-11 的单中子去除反应：与 eikonal 近似的偏差
DOI：
10.1103/physrevc.66.024607
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发表时间：
2002
影响因子：
3.1
通讯作者：
B. Sherrill
中科院分区：
文献类型：
--
作者：
J. Tostevin;D. Bazin;B. A. Brown;T. Glasmacher;P. Hansen;V. Maddalena;A. Navin;B. Sherrill
去除一个中子后的剩余核的动量分布已被测量与伽马射线确定与这些残留物的激发态和基态水平的分布相一致。这些微分部分截面映射的动量内容的去除核子波函数和它们的描述提供了一个严格的测试反应动力学。动量分布数据时，填充theC和Be基态表现出低-高的动量不对称性，这是迄今为止使用的程函描述不兼容。一个完全动态耦合离散连续通道描述的弹性破裂机制，提供了一个新的观察，这是最明显的弱约束，s波，核晕状态的理解。这种解释是进一步澄清的动量分布作为一个功能的角度的检测重基态残留物的分析。
The momentum distributions of the residual nuclei after one-neutron removal have been measured in coincidence with gamma rays identifying the distributions associated with the excited and ground state levels of these residues. These differential partial cross sections map the momentum content of the removed-nucleon wave functions and their description provides an exacting test of the reaction dynamics. Momentum distribution data when populating theC and Be ground states show a low-high momentum asymmetry that is incompatible with the hitherto used eikonal descriptions. A fully dynamical coupled discretized continuum channels description of the elastic breakup mechanism is shown to provide an understanding of this new observation which is most pronounced for weakly bound, s-wave, nuclear halo states. This interpretation is clarified further by an analysis of the momentum distributions as a function of the angle of detection of the heavy ground state residues.