Direct measurement of the mass difference of $^{72}$As-$^{72}$Ge rules out $^{72}$As as a promising $\beta$-decay candidate to determine the neutrino mass
Language
en
Article de revue
This item was published in
Phys.Rev.C. 2021, vol. 103, n° 6, p. 065502
English Abstract
We report the first direct determination of the ground-state to ground-state electron-capture Q value for the As72 to Ge72 decay by measuring their atomic mass difference utilizing the double Penning trap mass spectrometer, ...Read more >
We report the first direct determination of the ground-state to ground-state electron-capture Q value for the As72 to Ge72 decay by measuring their atomic mass difference utilizing the double Penning trap mass spectrometer, JYFLTRAP. The Q value was measured to be 4343.596(75) keV, which is more than a fiftyfold improvement in precision compared to the value in the most recent Atomic Mass Evaluation 2020. Furthermore, the new Q value was found to be 12.4(40) keV (3.1 σ) lower. With the significant reduction of the uncertainty of the ground-state to ground-state Q value combined with the level scheme of Ge72 from γ-ray spectroscopy, we confirm that the five potential ultralow Q-value β+ decay or electron capture transitions are energetically forbidden, thus precluding all the transitions as possible candidates for the electron neutrino mass determination. However, the discovery of small negative Q values opens up the possibility to use As72 for the study of virtual β-γ transitions.Read less <
English Keywords
Electroweak Interaction
Symmetries
neutrino: mass
mass: spectrometer
electron: capture
energy: ground state
nuclide: mass difference
Penning trap
experimental results
nucleus: semileptonic decay
energy: transition
experimental methods
Origin
Hal imported