Study of Gamow-Teller Transitions Playing Important Roles In the Neutrino Nucleosynthesis

Gamow-Teller相变是最常见的核弱过程之一。人们不仅对核物理感兴趣，而且对天体物理也感兴趣；它在各种核合成过程中发挥着重要作用，如超新星爆炸中的中微子诱导反应。通过对弱过程本身的研究可以获得相对有限的信息。然而，人们发现电荷交换反应，如(p，n)反应，可以模拟Gamow-Teller转变。他们可以在这项研究中扩展能量区域。随着(3He，t)测量的能量分辨率提高一个数量级，现在可以研究Gamow-Teller激发的精细结构，甚至可以研究Gamow-Teller巨共振的精细结构。讨论了具有天体物理意义的PF壳核的Gamow-Teller跃迁强度的确定。

Gamow-Teller transition is one of the most popular nuclear weak processes. The interest in the study is not only of nuclear physics, but also of astrophysics ; it plays important roles in various nucleosynthesis processes such as neutrino-induced reactions in supernova-explosion. Relatively limited information can be obtained through the study of weak processes themselves. However, it was found that charge-exchange reactions, such as (p,n) reaction, can simulate the Gamow-Teller transitions. They could extend the energy region in the study. With the one-order-of- magnitude improvement of the energy resolution in (3He,t) measurements, fine structures of Gamow-Teller excitations, even those of Gamow-Teller giant resonances, can now be studied. Determination of Gamow-Teller transition strengths for pf-shell nuclei with astrophysical interest is discussed.