Dy159 Electron-Capture : A New Candidate for Neutrino Mass Determination
Ge, Z., Eronen, T., Tyrin, K. S., Kotila, J., Kostensalo, J., Nesterenko, Dimitrii A., Beliuskina, O., de Groote, R., de Roubin, A., Geldhof, S., Gins, W., Hukkanen, M., Jokinen, A., Kankainen, A., Koszorús, Á., Krivoruchenko, M. I., Kujanpää, S., Moore, Ian D., Raggio, A., . . . Zadvornaya, A. (2021). Dy159 Electron-Capture : A New Candidate for Neutrino Mass Determination. Physical Review Letters, 127(27), Article 272301. https://doi.org/10.1103/PhysRevLett.127.272301
Published inPhysical Review Letters
DisciplineResurssiviisausyhteisöKiihdytinlaboratorioSchool of Resource WisdomAccelerator Laboratory
© 2021 American Physical Society
The ground state to ground state electron-capture Q value of 159Dy (3/2−) has been measured directly using the double Penning trap mass spectrometer JYFLTRAP. A value of 364.73(19) keV was obtained from a measurement of the cyclotron frequency ratio of the decay parent 159Dy and the decay daughter 159Tb ions using the novel phase-imaging ion-cyclotron resonance technique. The Q values for allowed Gamow-Teller transition to 5/2− and the third-forbidden unique transition to 11/2+ state with excitation energies of 363.5449(14) keV and 362.050(40) keV in 159Tb were determined to be 1.18(19) keV and 2.68(19) keV, respectively. The high-precision Q value of transition 3/2−→5/2− from this work, revealing itself as the lowest electron-capture Q value, is used to unambiguously characterize all the possible lines that are present in its electron-capture spectrum. We performed atomic many-body calculations for both transitions to determine electron-capture probabilities from various atomic orbitals and found an order of magnitude enhancement in the event rates near the end point of energy spectrum in the transition to the 5/2− nuclear excited state, which can become very interesting once the experimental challenges of identifying decays into excited states are overcome. The transition to the 11/2+ state is strongly suppressed and found unsuitable for measuring the neutrino mass. These results show that the electron-capture in the 159Dy atom, going to the 5/2− state of the 159Tb nucleus, is a new candidate that may open the way to determine the electron-neutrino mass in the sub-eV region by studying electron-capture. Further experimental feasibility studies, including coincidence measurements with realistic detectors, will be of great interest. ...
PublisherAmerican Physical Society (APS)
Publication in research information system
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Research costs of Academy Research Fellow, AoF; Academy Research Fellow, AoF; Academy Project, 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 fundingWe acknowledge the support by the Academy of Finland under the Finnish Centre of Excellence Program (Nuclear and Accelerator Based Physics Research at JYFL) and Projects No. 306980, 312544, 275389, 284516, 295207, 314733, 318043, 327629, and 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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