Search for a Neutrino with a Mass of 0.01–1.0 MeV in Beta Decays of  144 Ce– 144 Pr Nuclei

A. V. Derbin; I. S. Drachnev; I. S. Lomskaya; V. N. Muratova; N. V. Pilipenko; D. A. Semenov; L. M. Tukkhonen; E. V. Unzhakov; A. Kh. Khusainov

doi:10.1134/S0021364018200067

Search for a Neutrino with a Mass of 0.01–1.0 MeV in Beta Decays of ¹⁴⁴Ce–¹⁴⁴Pr Nuclei

Authors: Derbin A.V.¹, Drachnev I.S.¹, Lomskaya I.S.¹, Muratova V.N.¹, Pilipenko N.V.¹, Semenov D.A.¹, Tukkhonen L.M.¹, Unzhakov E.V.¹, Khusainov A.K.¹
Affiliations:
1. Petersburg Nuclear Physics Institute
Issue: Vol 108, No 8 (2018)
Pages: 499-503
Section: Fields, Particles, and Nuclei
URL: https://journals.rcsi.science/0021-3640/article/view/161359
DOI: https://doi.org/10.1134/S0021364018200067
ID: 161359

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Abstract
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Abstract

Spectra of electrons from beta decays of ¹⁴⁴Ce–¹⁴⁴Pr nuclei have been measured and analyzed in order to find a contribution from a heavy neutrino. For the neutrino with the mass m_νH in the interval of 150–350 keV, a new upper bound |U_eH|² ≤ (2−5) × 10⁻³ at 90% C.L. has been found for the mixing parameter.