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Paul-Antoine Hervieux (University of Strasbourg)2025-05-14, 8:45 a.m.Oral invited talk
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).
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[2] In preparation. -
Vincenzo Lordi (Lawrence Livermore National Laboratory)2025-05-14, 9:05 a.m.Oral invited talk
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,...
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David Diercks (Colorado School of Mines)2025-05-14, 9:25 a.m.Oral contributed talk
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...
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Iain McKenzie (TRIUMF)2025-05-14, 9:45 a.m.Oral invited talk
One puzzling observation in the $^7$Li recoil spectra of the BeEST data is the fact that the peaks widths were significantly larger than the ∼2eV width of the laser peaks set by the energy resolution of the STJ's. This isn't currently understood, thus is a limitation to the progression of the BeEST experimentation through the sensitivity, which is crucial for the observation of small SN masses...
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Caitlyn Stone-whitehead (Colorado School of Mines)2025-05-14, 10:05 a.m.Oral invited talk
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...
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Mohamad Kanafani (LPC Caen)2025-05-14, 10:25 a.m.Oral contributed talk
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.
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