On the keV sterile neutrino search in electron capture

Abstract

A joint effort of cryogenic microcalorimetry (CM) and high-precision Penning-trap mass spectrometry (PT-MS) in investigating atomic orbital electron capture (EC) can shed light on the possible existence of heavy sterile neutrinos with masses from 0.5 to 100 keV. Sterile neutrinos are expected to perturb the shape of the atomic de-excitation spectrum measured by CM after a capture of the atomic orbital electrons by a nucleus. This effect should be observable in the ratios of the capture probabilities from different orbits. The sensitivity of the ratio values to the contribution of sterile neutrinos strongly depends on how accurately the mass difference between the parent and the daughter nuclides of EC-transitions can be measured by, e.g., PT-MS. A comparison of such probability ratios in different isotopes of a certain chemical element allows one to exclude many systematic uncertainties and thus could make feasible a determination of the contribution of sterile neutrinos on a level below 1%. Several electron capture transitions suitable for such measurements are discussed.

16 pages, 9 figures, 2 tables

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Cited by in corpus (8)

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• Limits on the Existence of sub-MeV Sterile Neutrinos from the Decay of ${}^7$Be in Superconducting Quantum Sensors
• Light Dark Matter from Inflaton Decay
• The use of low temperature detectors for direct measurements of the mass of the electron neutrino
• Constraints on the Active and Sterile Neutrino Masses from Beta-Ray Spectra: Past, Present and Future
• Heavy sterile neutrino in dark matter searches
• Evidence for the virtual beta-gamma transition in 59Ni
• Warm dark matter sterile neutrinos in electron capture and beta decay spectra