The 9th Academic Salon of State Key Laboratory of Dark Matter Physics

by Dr Chang Ma (Yanshan University)

Friday 29 May 2026, 11:30 → 13:30 Asia/Shanghai

5#/6th-603 - Meeting Room 603 (Science Building)

Title: Theoretical description for nuclear beta decay in lead region

 

Speaker: Dr. Chang Ma (Yanshan University)

 

Host: Prof. Ke Han

 

Abstract:

Nuclear beta decay in the lead region provides important nuclear-structure information and is crucial to the interpretation of rare-event searches in low-background experiments such as PandaX. In this seminar, I will present our recent theoretical calculations of beta-decay properties for nuclei around the Pb–Bi–Po region, with particular emphasis on beta-decay spectra and logft values of first-forbidden transitions. The calculations are performed within a comprehensive framework, in which the relevant nuclear matrix elements are evaluated by using the nuclear shell model and combined with relativistic lepton wave functions incorporating finite nuclear-size and Coulomb screening effects. Furthermore, a Bayesian model is developed to analyze the role of nuclear-structure effects, quenching factors, and theoretical uncertainties in shaping observables. I will also discuss how these calculations can provide useful nuclear inputs for background characterization in PandaX-related studies, and outline possible extensions toward a more systematic description of beta-decay properties in heavy nuclei.

 

Biography:

Dr. Chang Ma is a lecturer at the School of Science, Yanshan University. He received his Ph.D. in theoretical nuclear physics from SJTU in 2024. His research interests include the low-lying nuclear structure and nuclear beta decay based on the nuclear shell model and its nucleon-pair approximation (NPA). During his doctoral studies, he developed an advanced NPA framework that improves computational efficiency by orders of magnitude, and successfully applied it to the study of nuclear spectra, electromagnetic properties, and beta-decay transitions. To date, he has published more than 10 first-author papers in Physical Review C, and is currently supported by the Young Scientists Fund (Category C) of NSFC.

 

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