Orateur
Description
The first experimental campaigns with FRIB Decay Station Initiator [1] at FRIB focused on the spectroscopy of very neutron-rich isotopes. They provided a wealth of data on beta-delayed neutron emitters. We will present the first results on the beta-delayed neutron emission spectroscopy near N=28 shell closure, such as ${}^{45,46,47}$Cl. Using a combination of neutron and gamma-ray data, we extracted the beta decay strength distribution to neutron unbound states and compared the results with the large-scale shell model calculations by Yoshida et al. [2], providing the first test of these predictions for the dominant Gamow-Teller transitions in this region. We also extracted the neutron-emission branching ratios to excited states in Ar isotopes and compared them with those predicted by the statistical model [3]. The importance of the discrepancies between model predictions and experimental data will be discussed.
[1] https://fds.ornl.gov/initiator/
[2] T. Kawano et al., Journal of Nuclear Science and Technology, 47(5),462, (2010), .
[3] S. Yoshida, Y. Utsuno, N. Shimizu, and T. Otsuka, Phys. Rev. C 97, 054321 (2018).
