A lab scale experiment for keV sterile neutrino search
Y. C. Lee, H. B. Kim, H. L. Kim, S. K. Kim, Y. H. Kim, D. H. Kwon, H., S. Lim, H. S. Park, K. R. Woo, Y. S. Yoon

TL;DR
This paper presents a small-scale experimental setup using a LiF crystal and microcalorimeter to measure tritium beta decay spectra, aiming to detect keV-scale sterile neutrinos.
Contribution
It introduces a novel, simplified experimental method for searching for sterile neutrinos in the keV mass range using beta decay spectra.
Findings
Spectrum measurement agrees with expected $^3$H decay
Method shows potential for sterile neutrino search
Sample preparation and analysis are effectively demonstrated
Abstract
We developed a simple small-scale experiment to measure the beta decay spectrum of H. The aim of this research is to investigate the presence of sterile neutrinos in the keV region. Tritium nuclei were embedded in a 111 cm LiF crystal from the Li(n,)H reaction. The energy of the beta electrons absorbed in the LiF crystal was measured with a magnetic microcalorimeter at 40 mK. We report a new method of sample preparation, experiments, and analysis of H beta measurements. The spectrum of a 10-hour measurement agrees well with the expected spectrum of H beta decay. The analysis results indicate that this method can be used to search for keV-scale sterile neutrinos.
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