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Title: Direct measurements of neutrino mass

Journal Article · · Physics Reports
ORCiD logo [1]; ORCiD logo [2];  [3]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Massachusetts Institute of Technology
  2. Northwestern Univ., Evanston, IL (United States)
  3. Univ. of Washington, Seattle, WA (United States)

The turn of the 21st century witnessed a sudden shift in our fundamental understanding of particle physics. While the minimal Standard Model predicts that neutrino masses are exactly zero, the discovery of neutrino oscillations proved the Standard Model wrong. Neutrino oscillation measurements, however, shed light neither on the scale of neutrino masses, nor on the mechanism by which those are generated. The neutrino mass scale is most directly accessed by studying the energy spectrum generated by beta decay or electron capture — a technique dating back to Enrico Fermi’s formulation of radioactive decay. In this Article, we review the methods and techniques – both past and present – aimed at measuring neutrino masses kinematically. Here, we focus on recent experimental developments that have emerged in the past decade, overview the spectral refinements that are essential in the treatment of the most sensitive experiments, and give a simple yet effective protocol for estimating the sensitivity. Finally, we provide an outlook of what future experiments might be able to achieve.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
FG02-97ER41020; SC0010143; SC0011091
OSTI ID:
1907696
Journal Information:
Physics Reports, Journal Name: Physics Reports Vol. 914; ISSN 0370-1573
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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