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arXiv 1106.3797nucl-th
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对称势的动量依赖性及其对核反应的影响

Momentum dependence of the symmetry potential and its influence on nuclear reactions

Zhao-Qing Feng

摘要:

首次在兰州量子分子动力学(LQMD)模型中参数化并实现了一个Skyrme型动量依赖的核子-核子力区分同位旋效应,导致了核物质中核子有效质量的分裂.基于同位旋和动量相关的输运模型,研究了动量相关的对称势对重离子碰撞中几个同位旋敏感观测值的影响。研究发现,具有动量依赖性的对称势和不具有动量依赖性的对称势,如果对应于相同的对称能密度依赖性,则会导致不同的观测量分布。中快中子/质子比在高横动量和激发函数的总$π^{-}/π^{+}$和$K^{0}/K^{+}$产额是特别敏感的对称势的动量依赖性。

英文摘要:

A Skyrme-type momentum-dependent nucleon-nucleon force distinguishing isospin effect is parameterized and further implemented in the Lanzhou Quantum Molecular Dynamics (LQMD) model for the first time, which leads to a splitting of nucleon effective mass in nuclear matter. Based on the isospin- and momentum-dependent transport model, we investigate the influence of momentum-dependent symmetry potential on several isospin-sensitive observables in heavy-ion collisions. It is found that symmetry potentials with and without the momentum dependence but corresponding to the same density dependence of the symmetry energy result in different distributions of the observables. The mid-rapidity neutron/proton ratios at high transverse momenta and the excitation functions of the total $π^{-}/π^{+}$ and $K^{0}/K^{+}$ yields are particularly sensitive to the momentum dependence of the symmetry potential.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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