Direct measurement of the mass difference of 72As−72Ge rules out 72As as a promising β-decay candidate to determine the neutrino mass

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., 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., . . . Jokinen, A. (2021). Direct measurement of the mass difference of 72As−72Ge rules out 72As as a promising β-decay candidate to determine the neutrino mass. Physical Review C, 103(6), Article 065502. https://doi.org/10.1103/PhysRevC.103.065502

Julkaistu sarjassa

Physical Review C

Tekijät

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.

Päivämäärä

2021

Oppiaine

Ydin- ja kiihdytinfysiikan huippuyksikkö Centre of Excellence in Nuclear and Accelerator Based Physics

Tekijänoikeudet

We report the first direct determination of the ground-state to ground-state electron-capture Q value for the 72As to 72Ge 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 72Ge 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 72As for the study of virtual β−γ transitions.

Julkaisija

American Physical Society (APS)

ISSN Hae Julkaisufoorumista

2469-9985

Rahoittaja(t)

Suomen Akatemia; Euroopan komissio

Rahoitusohjelmat(t)

Akatemiatutkijan tutkimuskulut, SA; Akatemiatutkija, SA

The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.

Lisätietoja rahoituksesta

We thank the support by the Academy of Finland under the Finnish Centre of Excellence Programme 2012-2017 (Nuclear and Accelerator Based Physics Research at JYFL) and Projects No. 306980, No. 312544, No. 275389, No. 284516, No. 295207, No. 314733, No. 327629, and No. 320062. The support by the EU Horizon 2020 research and innovation program under Grant No. 771036 (ERC CoG MAIDEN) is acknowledged.

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