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Calculation of resonance energies from Q values

机译:从Q值计算谐振能量

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Resonance energies are frequently derived from precisely measured excitation energies and reaction Q values. The latter quantities are usually calculated from atomic instead of nuclear mass differences. This procedure disregards the energy shift caused by the difference in the total electron binding energies before and after the interaction. Assuming that the interacting nuclei in a stellar plasma are fully ionized, this energy shift can have a significant effect, considering that the resonance energy enters exponentially into the expression for the narrow-resonance thermonuclear reaction rates. As an example, the rate of the Ar-36( p, gamma)K-37 reaction is discussed, which, at temperatures below 1 GK, depends only on the contributions of a single resonance and direct capture. In this case, disregarding the energy shift caused by the total electron binding energy difference erroneously enhances the rate by approximate to 40% near temperatures of 70 MK.
机译:共振能量经常从精确测量的激发能量和反应Q值衍生出来。 后一批数量通常根据原子代替核质量差异计算。 该程序忽略了相互作用前后的总电子结合能量差异引起的能量移位。 假设恒星等离子体中的相互作用核完全电离,这种能量偏移可以具有显着的效果,考虑到共振能量以窄共振热核反应率的表达呈指数级呈指数上。 作为示例,讨论了Ar-36(P,γ)K-37反应的速率,在低于1GK的温度下仅取决于单个共振和直接捕获的贡献。 在这种情况下,忽略由电子结合能量差的总结合能量差引起的能量移位错误地增强了近似达到70 mk的40%的速率。

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