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., . . . Zadvornaya, A. (2022). 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. Physical Review C, 106(1), Article 015502. https://doi.org/10.1103/PhysRevC.106.015502
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Physical Review CDate
2022Discipline
ResurssiviisausyhteisöKiihdytinlaboratorioSchool of Resource WisdomAccelerator LaboratoryCopyright
©2022 American Physical Society
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 with the excitation energy from γ-ray spectroscopy, the Q values for ground-state–to–excited-state transitions 76As (ground state) →76Se∗ (2968.4(7) keV) and 155Tb (ground state) →155Gd∗ (815.731(3) keV) were derived to be −9.13(70) keV and −0.79(18) keV. Thus we have confirmed that both of the β−-decay and EC-decay candidate transitions are energetically forbidden at a level of at least 4σ, thus definitely excluding these two cases from the list of potential candidates for the search of low-Q-value β− or EC decays to determine the electron-(anti)neutrino mass.
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American Physical Society (APS)ISSN Search the Publication Forum
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https://converis.jyu.fi/converis/portal/detail/Publication/151780900
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European Commission; Research Council of FinlandFunding program(s)
ERC Consolidator Grant; Academy Project, AoF; Academy Research Fellow, AoF; MSCA Innovative Training Networks (ITN); Research costs of Academy Research Fellow, AoF
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.
Additional information about funding
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. 318043, 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. This project has received funding from the European Union's Horizon 2020 research and innovation programme under Grant Agreement No. 861198-LISA-H2020-MSCA-ITN-2019. ...License
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