恒星和实验室反应截面之间的差异
Differences between stellar and laboratory reaction cross sections
摘要：
由于等离子体中的热效应，恒星等离子体中的核反应与实验室中的反应不同。一方面，靶原子核被以等离子体温度定义的能量分布的射弹轰击。根据核物理标准，最相关的能量是低的，因此需要改进对低能性质的描述，例如计算反应截面所需的光学势。最近对低能截面的研究表明有必要对质子光学势进行修正。另一方面，靶核与等离子体处于热平衡，这改变了它们的反应截面。通常预期，对于吸热反应，这种改性更大。我们表明，有许多例外，这一规则。
英文摘要：
Nuclear reactions proceed differently in stellar plasmas than in the laboratory due to the thermal effects in the plasma. On one hand, a target nucleus is bombarded by projectiles distributed in energy with a distribution defined by the plasma temperature. The most relevant energies are low by nuclear physics standards and thus require an improved description of low-energy properties, such as optical potentials, required for the calculation of reaction cross sections. Recent studies of low-energy cross sections suggest the necessity of a modification of the proton optical potential. On the other hand, target nuclei are in thermal equilibrium with the plasma and this modifies their reaction cross sections. It is generally expected that this modification is larger for endothermic reactions. We show that there are many exceptions to this rule.
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