[Triumf-seminars] TRIUMF Theory Seminar today at 13:00

[TRIUMF Seminars]

Date/Time: Wed 2021-12-01 at 13:00

Location:  Remote              

Speaker:   Tong Li (Michigan State U)

Title:     Model calibration for beta-decay calculations

Abstract: Theoretical predictions for beta-decay rates are important nuclear inputs for the study of nucleosynthesis in the universe, especially the r process which traverses through the neutron-rich 
region with no experimental data. Thanks to recent developments of the finite amplitude method, 
we  are  able  to  perform  beta-decay  calculations  over  the  whole  nuclear  landscape  within  the framework of the Skyrme density functional theory. In this talk I will discuss our recent research on model calibration for beta-decay calculations, which is expected to provide reliable predictions with quantified uncertainty for r-process simulations. The parameters we calibrate include the time-odd isovector Skyrme couplings, isoscalar pairing  strength and  effective  axial-vector  coupling constant; they are fitted to selected experimental data of Gamow-Teller resonances and beta-minus-decay  half  lives.  We carry out both chi-square optimizations  (frequentist  method)  and  Bayesian  model calibrations, and our preliminary results show consistency between the two approaches. In the talk I will discuss the model-calibration  procedure  we  adopt  in  detail,  which can also be effectively employed in other physics problems.

https://ubc.zoom.us/j/62535266430?pwd=THVrUzhMdjAyVkNnM05OUWRZYUppZz09

Meeting ID: 625 3526 6430
Passcode: 307647



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