Presentation materials
We will present our latest results on (i) the calculation of electron capture decay probabilities, focusing on the effect of atomic electronic structure modelling and shaking processes [1] (ii) the influence of the tantalum matrix on the P_L/P_K ratio [2].
[1] A. Andoche, L. Mouawad, P.-A. Hervieux, X. Mougeot, J. Machado, and J. P. Santos, Physical Review A 109, 032826 (2024).
[2] In preparation.
I will summarize various atomistic computational efforts to understand materials science effects on the sensitivity of BeEST experiments. Quantum mechanical simulations based on density functional theory (DFT) were applied to understand possible uncertainties (broadening) of capture peak energies due to defects (impurities, clustering, intersitial vs substitutional doping, crystal damage,...
Recent BeEST experimental results displayed that the breadth of the measured peaks associated with electron capture (EC) decay were wider than the inherent resolution of the superconducting tunnel junction detector (STJ). One possible source of the measured peak resolution being appreciably worse than the resolution inherent in the STJ detector is from local imperfections in the materials...
One puzzling observation in the
G4CMP has been developed as an extension to GEANT4 to excite phonons and charges in cryogenic semiconductor crystals in response to energy deposited by radiation. G4CMP is currently being developed towards superconducting processes in the developer's consortium, allowing for modelling the implanted BeEST signal. This talk will demonstrate the applications and value of G4CMP for simulating the...
Poor knowledge of incomplete energy deposition of Auger electrons are a limiting factor in the BeEST's sensitivity to sterile neutrinos. We will present state of the art low-energy scattering simulations and focus on how current approximations determine systematic uncertainties.
