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Unexpected neutron/proton ratio and isospin effect in low-energy antiproton-induced reactions

机译:出乎意料的中子/质子比和低能量抗腐蚀诱导反应中的肌散效应

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摘要

The inclusive spectra of pre-equilibrium nucleons produced in low-energy antiproton-nucleus collisions are thoroughly investigated within the the Lanzhou quantum molecular dynamics transport approach for the first time. The reaction channels of elastic scattering, annihilation, charge exchange, and inelastic processes in antibaryon-baryon, baryon-baryon, and meson-baryon collisions have been implemented in the model. The unexpected neutron to proton yield ratios are caused from the isospin effects of pion-nucleon collisions and the symmetry energy. It is found that the pi(-)-neutron collisions enhance the neutron emission in the antiproton annihilation in a nucleus. A soft symmetry energy with the stiffness of gamma(s) = 0.5 at subsaturation densities is constrained from the available data of the neutron/proton spectra.
机译:在兰州量子分子动力学运输方法首次在兰州量子分子动力学运输方法中彻底研究了低能量抗批发 - 核碰撞中产生的预平衡核的包容光谱。 在模型中已经在模型中实施了弹性散射,湮灭,电荷交换和无弹性方法的弹性散射,湮灭,电荷交换和无弹性过程。 意外的中子至质子屈服比是由孔核碰撞和对称能量的异旋效应引起的。 发现PI( - ) - 中子碰撞增强了核中的抗腐蚀湮灭中的中子发射。 在余量密度下,具有γ= 0.5的软性的软对称能量受中子/质子光谱的可用数据约束。

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