Min Si "Beta-decay spectroscopy of exotic nuclei around 132Sn"

vendredi 25 nov. 2022, 10:00 → 12:00 Europe/Paris

200/0-Auditorium - Auditorium P. Lehmann (IJCLab)

Beta-decay spectroscopy of exotic nuclei around ¹³²Sn

Abstract : 

This thesis work reports on the beta-decay spectroscopy of ¹³⁶Sb,¹³⁷Te, and ¹³⁹Te nuclei beyond the doubly-magic ¹³²Sn. The experiments on ¹³⁶Sb and ¹³⁷Te are performed at the Lohengrin spectrometer, ILL laboratory using a moveable tape system combined with HpGe clover detectors and plastic detectors. The experiment on the first beta-decay spectroscopy of ¹³⁹Te is performed at the RIBF, RIKEN laboratory using the WASABI and EURICA detector systems. For the beta decay spectroscopy, the ion-beta-gamma correlation method is employed to reconstruct the beta-decay events. 

The half-lives and P_n values of these nuclei are obtained together with the newly established beta-delayed level schemes for the daughter nuclei. These experimental results complement our knowledge of this mass region with several new spectroscopic findings. They are also used to compare with large-scale shell model calculations and provide essential information on the first-forbidden transitions beyond N=82 and Z=50.