Determining the neutrino mass with cyclotron radiation emission spectroscopy—Project 8
The most sensitive direct method to establish the absolute neutrino mass is observation of the endpoint of the tritium beta-decay spectrum. Cyclotron radiation emission spectroscopy (CRES) is a precision spectrographic technique that can probe much of the unexplored neutrino mass range with $${ \mathcal O }(\mathrm{eV})$$ resolution. A lower bound of $$m({\nu }_{e})\gtrsim 9(0.1)\,\mathrm{meV}$$ is set by observations of neutrino oscillations, while the KATRIN experiment—the current-generation tritium beta-decay experiment that is based on magnetic adiabatic collimation with an electrostatic (MAC-E) filter—will achieve a sensitivity of $$m({\nu }_{e})\lesssim 0.2\,\mathrm{eV}$$. The CRES technique aims to avoid the difficulties in scaling up a MAC-E filter-based experiment to achieve a lower mass sensitivity. Here in this paper we review the current status of the CRES technique and describe Project 8, a phased absolute neutrino mass experiment that has the potential to reach sensitivities down to $$m({\nu }_{e})\lesssim 40\,\mathrm{meV}$$ using an atomic tritium source.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)
- Contributing Organization:
- Project 8 Collaboration
- Grant/Contract Number:
- AC52-07NA27344; FG02-97ER41020; SC0011091; SC0012654; AC05-76RL01830
- OSTI ID:
- 1455399
- Report Number(s):
- LLNL-JRNL-738790; 892307; TRN: US1901230
- Journal Information:
- Journal of Physics. G, Nuclear and Particle Physics, Vol. 44, Issue 5; ISSN 0954-3899
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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