Tuesday, September 15, 2020
National Superconducting Cyclotron Laboratory Seminar
(Conferences / Seminars / Lectures)
Xilin Zhang from Ohio State University willbe presenting "Ab initio calculations of low-energy nuclear scattering using confining potential traps." more information...
Ab initio nuclear structure calculations that compute nuclear static properties based on underlying NN interactions and three-nucleon forces have now progressed to studying medium-mass nuclei. However, first-principle calculations for nuclear scattering/reactions are still limited to light systems. A method suitable for heavier nuclei would be very valuable in studying scattering/reactions with astrophysical relevance and for the success of the coming FRIB program that will focus on unstable nuclei near drip lines. In this talk, I will present my recent development of such a method (2004.13575 and 1905.05275). It is similar in spirit to the so-called Luscher method, used in Lattice QCD for computing hadronic scattering. The key idea is a computational experiment: realizing the trapping of nucleus-nucleus or nucleus-nucleon systems in harmonic potential well within the ab initio spectrum calculations, and then extracting scattering information from the output. I will discuss the formalism and report encouraging results from my collaboration with ab initio groups on computing neutron--alpha and neutron--Oxygen-24 scattering phase shifts. I will also discuss ways to generalize this approach to the case of inelastic reactions and three-cluster systems, including the one opened up by our recently developed emulator (2007.03635) for scattering.