GPPU Seminar

Theoretical study of the ³H(p,e⁺,e^-)⁴He reaction and the search for the particle X17

Michele Viviani
(INFN, Pisa)

Date

14:00-16:00, August 19th, 2020

Place

The seminar will be given via Zoom. Register in advance for this meeting:
https://us02web.zoom.us/meeting/register/tZYkcO6hqzooGdWY9bFdYJFn9g08myBDlZN2 map

Abstract

(This seminar is a part of Mini-workshop on "Three-body forces and related topics")

Recently, the observation of a new particle (preliminary called X17) in the reaction ³H(p,e⁺,e^-)⁴He has been claimed [1]. This announcement is based on the observation of an unexpected peak in the electron-positron angular distribution. In a precedent experiment, the same experimental group observed an analogous effect in the decay of an excited state of ⁸Be. We have started the theoretical study of the reaction ³H(p,e⁺,e^-)⁴He by taking into account accurately the four nucleon dynamics and using state-of-the-art electromagnetic transition operators. Preliminary results will be presented.

[1] A. J. Krasznahorkay et al.,(2019) arXiv:1910.10459

Point

GASP 1

Contact: Yusuke Tanimura (tanimura [at] nucl.phys.tohoku.ac.jp)