Draft:Project 8
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Project 8 is an international collaboration and physics experiment. It is divided in four progressing stages (Phase I, II, III & IV), each having their own goals and experiments. Its final goal is to measure an upper mass limit of the electron antineutrino in the sub-eV range with a sensitivity of approximately 40 meV. [1][2][3]
The experiment makes use of beta-decay for its measurement. The energy spectrum from beta-decay electrons depends on the mass of the electron antineutrino. Reconstructing the neutrino mass involves measuring the endpoint spectrum, where its mass dependence is prominent. [4] Project 8 relies on cyclotron radiation from single electrons produced in beta decay in order to measure their energy, a method dubbed CRES (Cyclotron Radiation Emission Spectroscopy). The cyclotron radiation is captured using a cavity/waveguide. This method was first succesfully demonstrated as part of Phase I of Project 8. [5]
The beta decay source for the 40 meV experiment is planned to be atomic Tritium. This provides higher precision than molecular Tritium due to the uncertainty of the endstates in the latter.
A similar experiment using Tritium beta decay is KATRIN. This type of design requires a large spectrometer which suffers from scaling issues as the fiducial volume of Tritium goes up. CRES is therefore a more suitable method for increasing the sensitivity of the electron antineutrino upper mass limit in future experiments.
External links
[edit]References
[edit]- ^ Kwon, Diana (2015-05-20). "Small teams, big dreams | symmetry magazine". www.symmetrymagazine.org. Retrieved 2024-11-18.
- ^ "Циклотронное излучение открывает новые возможности для измерения массы нейтрино • Новости науки". «Элементы» (in Russian). Retrieved 2024-11-18.
- ^ Overgaard, Elise (2023-01-24). "Ways to weigh a neutrino | symmetry magazine". www.symmetrymagazine.org. Retrieved 2024-11-18.
- ^ "Neutrino Mass Experiment - About". www.project8.org. Retrieved 2024-11-18.
- ^ Asner, D. M.; Bradley, R. F.; de Viveiros, L.; Doe, P. J.; Fernandes, J. L.; Fertl, M.; Finn, E. C.; Formaggio, J. A.; Furse, D.; Jones, A. M.; Kofron, J. N.; LaRoque, B. H.; Leber, M.; McBride, E. L.; Miller, M. L. (2015-04-20). "Single-Electron Detection and Spectroscopy via Relativistic Cyclotron Radiation". Physical Review Letters. 114 (16). doi:10.1103/PhysRevLett.114.162501. ISSN 0031-9007.