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arXiv 1107.1264nucl-thnucl-ex
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质子从奇异核分裂的动力学效应

Dynamical effects in proton breakup from exotic nuclei

Ravinder Kumar, Angela Bonaccorso

备注：
10 pages, 8 figures, 1 table. Accepted for publication on Phys. Rev. C
发表信息：
Phys.Rev.C84:014613,2011
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摘要：

本文研究了奇异核中质子从弱束缚态到重靶分裂的动力学效应。质子与核和质子与靶之间的库仑相互作用被处理到所有的级别，包括库仑势的完全多极展开。质子核分裂和库仑分裂的动力学与具有较大结合能的等效中子的动力学进行了比较，以阐明与已被充分理解的中子分裂机制的差异。计算了平行动量分布、质子角分布和总分裂截面等实验可测量。关于核分裂，我们发现质子的行为与具有较大结合能的中子完全相同。额外的“有效能量”是由于组合的核-靶库仑势垒。在库仑分裂中，我们区分了核靶库仑势的影响（称为反冲效应），相对于此，质子再次表现为更受束缚的中子，从直接质子靶库仑势。后者给出的截面比反冲项大约大一个数量级。这两种效应在平行动量分布中产生了复杂的干涉。相反，它们很容易分离的质子角分布，因此建议作为一个非常有用的观察未来的实验研究。

英文摘要：

We study dynamical effects in proton breakup from a weakly bound state in an exotic nucleus on a heavy target. The Coulomb interactions between the proton and the core and the proton and the target are treated to all orders, including also the full multipole expansion of the Coulomb potential. The dynamics of proton nuclear and Coulomb breakup is compared to that of an equiva- lent neutron of larger binding energy in order to elucidate the differences with the well understood neutron breakup mechanism. A number of experimentally measurable observables such as parallel momentum distributions, proton angular distributions and total breakup cross sections are calculated. With respect to nuclear breakup it is found that a proton behaves exactly as a neutron of larger binding energy. The extra 'effective energy' is due to the combined core-target Coulomb barrier. In Coulomb breakup we distinguish the effect of the core-target Coulomb potential (called recoil effect), with respect to which the proton behaves again as a more bound neutron, from the direct proton-target Coulomb potential. The latter gives cross sections about an order of magnitude larger than the recoil term. The two effects give rise to complicated interferences in the parallel momentum distributions. They are instead easily separable in the proton angular distributions which are therefore suggested as a very useful observable for future experimental studies.

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