间接测量天体物理S因子的特洛伊木马方法

Trojin Horse Method for Indirect Measurement of Astrophysic S Factor

天体环境下的核反应速率是各种关于天体核合成理论模型所需的输入量,对于了解天体核合成过程,以及宇宙的演化很重要。但是在天体温度下,核反应是在很低的能量上发生的。由于库仑位垒的作用,反应截面非常低,直接测量很难进行。通过测量合适的三体反应截面,特洛伊木马方法提供了一种提取感兴趣的低能两体反应截面的方法;而且,采用一系列近似可得到便于计算的理论公式。本文介绍特洛伊木马方法的原理及其在天体核反应中的应用。

The nuclear reaction rates in the astrophysical environment are indispensable input parameters in different astrophysics theories, and play important roles in understanding the astrophysical nuclear synthesis and the evolution of the universe. However,at the astrophysical temperature, the nuclear reactions proceed at very low energies. Due to the Coulumb barrier the reaction cross sections are very small, so that the direct measurement is almost impossible. The Trojin horse theory provides a useful method to measure indirectly the low energy two body cross sections by measuring the suitable three body reactions. Some approximations are applied in the theory to get convenient formula. This paper introduces the Trojin horse theory and its application in astrophysics nuclear reactions.