Speaker
Description
Liquid Argon (LAr) Time Proportional Chambers (TPCs), is one of the most widely used scintillators in particle detection, due to its low cost, high availability and excellent scintillation properties. A large number of experiments in the neutrino sector are based around using LAr in one or more TPCs, leading to high resolution three-dimensional particle reconstruction. We present a first principles study of total quanta yield for liquid argon (LAr) and recombination process, using inter-atomic potentials, and the integro-differential equation solution for atomic motion with electronic straggling. We are going to introduce the electronic scaling length $\xi_e$ as a fundamental parameter and explain the physical observable related to it. We are going to study the energy and electric field dependence of exciton to ion ratio for nuclear recoils, based on Bates-Griffing atomic process and semiclasical atomic interactions. The results for light and charge yield are going to be given in terms of the recombination probability in the context of the Thomas-Imel box model, in terms of just two parameters, $\xi_e$ and a constant. An explanation and comparison with recent measurements of the box size electric field dependence, is going to be given for LAr and LXe.
