Abstract
The ground-state-to-ground-state -decay value of has been directly measured for the first time. The measurement was done utilizing both the phase-imaging ion-cyclotron resonance technique and the time-of-flight ion-cyclotron resonance technique at the JYFLTRAP Penning-trap setup and yielded a mass difference of 268.66(30) keV between and . With this very small uncertainty, this measurement is a factor of 3 more precise than the currently adopted value in the Atomic Mass Evaluation 2016. The measurement confirms that the first-forbidden unique -decay transition is a candidate for antineutrino mass measurements with an ultralow value of 0.44(31) keV. This value is almost an order of magnitude smaller than those of nuclides presently used in running or planned direct (anti)neutrino mass experiment.
- Received 20 February 2020
- Revised 10 April 2020
- Accepted 7 May 2020
DOI:https://doi.org/10.1103/PhysRevLett.124.222503
© 2020 American Physical Society