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Material Effects on Electron Capture Decays in Cryogenic Sensors | | Amit Samanta
; Stephan Friedrich
; Kyle G. Leach
; Vincenzo Lordi
; | | Date: |
1 Jun 2022 | | Abstract: | Several current searches for physics beyond the standard model are based on
measuring the electron capture (EC) decay of radionuclides implanted into
cryogenic high-resolution sensors. The sensitivity of these experiments has
already reached the level where systematic effects related to atomic-state
energy changes from the host material are a limiting factor. One example is a
neutrino mass study based on the nuclear EC decay of $^7$Be to $^7$Li inside
cryogenic Ta-based sensors. To understand the material effects at the required
level we have used density functional theory and modeled the electronic
structure of lithium atoms in different atomic environments of the
polycrystalline Ta absorber film. The calculations reveal that the Li 1s
binding energies can vary by more than 2 eV due to insertion at different
lattice sites, at grain boundaries, in disordered Ta, and in the vicinity of
various impurities. However, the total range of Li 1s shifts does not exceed 4
eV, even for extreme amorphous disorder. Further, when investigating the
effects on the Li 2s levels, we find broadening of more than 5 eV due to
hybridization with the Ta band structure. Materials effects are shown to
contribute significantly to peak broadening in Ta-based sensors that are used
to search for physics beyond the standard model in the EC decay of $^7$Be, but
they do not explain the full extent of observed broadening. Understanding these
in-medium effects will be required for current- and future-generation
experiments that observe low-energy radiation from the EC decay of implanted
isotopes to evaluate potential limitations on the measurement sensitivity. | | Source: | arXiv, 2206.00150 | | Services: | Forum | Review | PDF | Favorites | |
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