Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 1: Invited Talks I
HK 1.3: Invited Talk
Monday, March 28, 2022, 12:00–12:30, HK-H1
Nuclear ab-initio theory for neutrino oscillations — •Joanna Sobczyk1, Sonia Bacca1, and Bijaya Acharya2 — 1Johannes Gutenberg-Universitat, Mainz, Germany — 2Oak Ridge National Laboratory, Oak Ridge, USA
We are entering an era of high-precision neutrino oscillation experiments (T2HK, DUNE), which potentially hold answers to some of the most exciting questions in particle physics. Their scientific program requires a precise knowledge of neutrino-nucleus interactions coming from fundamental nuclear studies. Ab initio many-body theory has made great advances in the last years and is able to give relevant predictions for medium-mass nuclei.
In my talk I will give an overview of the recent progress that has been made in describing neutrino-nucleus scattering within the ab-initio coupled-cluster framework, combined with the Lorentz integral transform. These techniques open the door to obtaining nuclear responses (and consequently cross-sections) for medium-mass nuclei starting from first principles. A series of steps has been made in this direction. Firstly, the nuclear 1- and 2-body currents have been re-derived and checked for the case of neutrino-deuteron scattering. Afterwards, the Coulomb sum rule of 16O has been calculated, introducing a new technique to remove the center-of-mass contamination. This allowed us to calculate for the first time the longitudinal response of 40Ca. Recently, we obtained spectral functions which enabled us to extend our calculations to the relativistic regime within the impulse approximation.