Orateur
Description
Nuclear charge-exchange reactions can be used to estimate the electron-capture rates which are key quantities in various astrophysical scenarios, such as the final evolution of intermediate-mass stars, core-collapse supernovae (CCSN), cooling of the neutron star crust, and nucleosynthesis in thermonuclear supernovae. Over the past decades, great progress has been made to constrain electron-capture rates on stable nuclei by using reactions in forward kinematics. However, the unstable neutron-rich nuclei that play an important role during, for example, the core-collapse supernovae (N≈50, Z≳28), remained inaccessible. The use of the $(d,{ }^{2}\text{He})$ charge-exchange reaction in inverse kinematics with the Active-Target Time-Projection Chamber and the S800 Spectrograph was developed at NSCL/FRIB, for extracting Gamow-Teller strengths in the β+ direction on unstable nuclei. This makes it possible, for the first time, to constrain electron-capture rates on neutron-rich nuclei. In this talk I will discuss recent results of the pilot $^{14}\text{O}(d,{ }^{2}\text{He})$ experiment.
This work is supported by the National Science Foundation under Grants PHY-2209429, “Windows on the Universe: Nuclear Astrophysics at FRIB”
