Although the mass of the electron antineutrino is still eluding direct measurement, the KATRIN experiment with its huge spectrometer has pushed the sensitivity below a billionth of the proton mass.
This is a preview of subscription content
Access options
Subscribe to Nature+
Get immediate online access to the entire Nature family of 50+ journals
$29.99
monthly
Subscribe to Journal
Get full journal access for 1 year
$99.00
only $8.25 per issue
All prices are NET prices.
VAT will be added later in the checkout.
Tax calculation will be finalised during checkout.
Buy article
Get time limited or full article access on ReadCube.
$32.00
All prices are NET prices.

References
Cowan, C. L., Reines, F., Harrison, F. B., Kruse, H. W. & McGuire, A. D. Science 124, 103–104 (1956).
Olive, K. et al. Chin. Phys. C 38, 090001 (2014).
The KATRIN Collaboration Nat. Phys. https://doi.org/10.1038/s41567-021-01463-1 (2022).
Fermi, E. Z. Phys. 88, 161–177 (1934); English trans: Wilson, F. L. Am. J. Phys. 36, 1150–1160 (1968).
Lubimov, V., Novikov, E., Nozik, V., Tretyakov, E. & Kosik, V. Phys. Lett. B 94, 266–268 (1980).
Drexlin, G., Hannen, V., Mertens, S. & Weinheimer, C. Adv. High Energy Phys 2013, 293986 (2013).
Capozzi, F. et al. Phys. Rev. D 101, 116013 (2020).
Ashtari Esfahani, A. et al. J. Phys. G 44, 054004 (2017).
Gastaldo, L. et al. Eur. Phys. J. Spec. Top. 226, 1623–1694 (2017).
Alpert, B. et al. Eur. Phys. J. C 75, 112 (2015).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Competing interests
The author declares no competing interests.
Rights and permissions
About this article
Cite this article
Nucciotti, A. Still too small to be measured. Nat. Phys. 18, 128–129 (2022). https://doi.org/10.1038/s41567-021-01495-7
Published:
Issue Date:
DOI: https://doi.org/10.1038/s41567-021-01495-7
Further reading
-
Newsworthy neutrinos
Nature Physics (2022)