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Abstract:
Weak interaction plays important roles in modern physics, especially invarious astrophysical phenomena such as core-collapse supernovae, heating and cooling of neutron star crusts, synthesis of heavy elements etc.In most cases these reaction rates (e.g. beta-decay, electron-capture) are determined by Gamow-Teller transition strengths [B(GT)] and a calculable phase space. Beta-decay studies performed in laboratory environments provide limited information on B(GT) due to limited Q values. A special type of nuclear reaction, charge-exchange reaction which is mediated by strong force though, is well suited to probe nuclear B(GT) up to very high excitation energies as there is no Q-value limitation, providing valuable nuclear data inputs for astrophysical simulations. Such data may also be needed in other research where neutrinos are involved.
In this talk, I will discuss in general how to use the charge-exchange reactions to measure nuclear B(GT) and the applications in astrophysical studies. Experimental techniques for such measurements will be introduced. A few specific examples of charge-exchange reactions that I have involved will be presented as well.
Biography:
Dr. Bingshui Gao is an associate researcher working in the nuclear astrophysics group at the Institute of Modern Physics (IMP). He obtained his doctor’s degree from the IMP in 2015. During 2017-2018, Dr. Gao worked in the charge-exchange group as a postdoc in the National Superconducting Cyclotron Laboratoryat Michigan State University.His research interest lies in the determination of weak interaction rates in astrophysical sites via charge-exchange reactions. An example of his works is the measurement of59Febeta-decay rate in stellar environment via the 59Co(t,3He)59Fe charge-exchange reaction, which helps understanding the long-standing puzzle of 26Al/60Fe gamma-ray flux ratio.
Online meeting room：
https://meeting.tencent.com/dm/8TNoXuOXPfRt (ID: 355564197, password: 123456)