Status of the heavy neutrino search using the BeEST experiment Phase-III data

ORAL

Abstract

The Beryllium Electron capture in Superconducting Tunnel junctions (BeEST) experiment searches for the signature of sub-MeV heavy neutrino mass eigenstates in the decay of 7Be. In the current Phase-III, we utilized a 36-pixel array of superconducting tunnel junction (STJ) cryogenic sensors to precisely measure the nuclear recoil energy of the 7Li daughter nucleus resulting from the 7Be electron capture decay. We highlight the refined experimental and analytical techniques implemented in Phase-III, and present the current status of the heavy neutrino search using the Phase-III data.

*The BeEST experiment is supported, in part, by the DOE-SC Office of Nuclear Physics, the Gordon and Betty Moore Foundation, and the European Metrology Programme for Innovation and Research (EMPIR). TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52- 07NA27344

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Publication: https://doi.org/10.48550/arXiv.2409.19085

Presenters

  • Inwook Kim

    • Lawrence Livermore National Laboratory

Authors

  • Inwook Kim

    • Lawrence Livermore National Laboratory