GE, Z.; ERONEN, T.; DE ROUBIN, A.; NESTERENKO, D.A.; HUKKANEN, M.; BELIUSKINA, O.; DE GROOTE, R.; GELDHOF, S.; GINS, W.; KANKAINEN, A.; KOSZORÚS, Á.; KOTILA, J.; KOSTENSALO, J.; MOORE, I.D.; RAGGIO, A.; RINTA-ANTILA, S.; SUHONEN, J.; VIRTANEN, V.; WEAVER, A.P.; ZADVORNAYA, A.; JOKINEN, A.

doi:10.1103/PhysRevC.103.065502

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GE, Z.

ERONEN, T.

DE ROUBIN, A.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

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Phys.Rev.C. 2021, vol. 103, n° 6, p. 065502

Résumé en anglais

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.< Réduire

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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

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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

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