Direct determination of the atomic mass difference of the pairs 76As−76Se and 155Tb−155Gd rules out 76As and 155 Tb as possible candidates for electron (anti)neutrino mass measurements
- Ge, Z.
- Eronen, T.
- de Roubin, A.
- Kostensalo, J.
- Suhonen, J.
- Nesterenko, D. A.
- Beliuskina, O.
- de Groote, R.
- Delafosse, C.
- Geldhof, S.
- Gins, W.
- Hukkanen, M.
- Jokinen, A.
- Kankainen, A.
- Kotila, J.
- Koszorús, Á.
- Moore, I. D.
- Raggio, A.
- Rinta-Antila, S.
- Virtanen, V.
- Weaver, A. P.
- Zadvornaya, A.
DOIAbstract
The first direct determination of the ground-state–to–ground-state Q values of the β− decay 76As→76Se and the electron-capture decay 155Tb→155Gd was performed utilizing the double Penning trap mass spectrometer JYFLTRAP. By measuring the atomic mass difference of the decay pairs via the phase-imaging ion-cyclotron-resonance technique, the Q values of 76As→76Se and 155Tb→155Gd were determined to be 2959.265(74) keV and 814.94(18) keV, respectively. The precision was increased relative to earlier measurements by factors of 12 and 57, respectively. The new Q values are 1.33 keV and 5 keV lower compared to the values adopted in the most recent Atomic Mass Evaluation 2020. With the newly determined ground-state–to–ground-state Q values combined ...
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