Direct Measurement of the Mass Difference of 163Ho and 163Dy Solves the Q-Value 
Puzzle for the Neutrino Mass Determination

Eliseev, Sergey; Blaum, Klaus; Block, M.; Chenmarev, S.; Dorrer, H.; Düllmann, Ch.E.; Enss, C.; Filianin, P. E.; Gastaldo, L.; Goncharov, Mikhail; Köster F., U.; Lautenschläger, F.; Novikov, Yu.N.; Rischka, Alexander; Schüssler, R. X.; Schweikhard, L.; Türler, A.

doi:10.1103/PhysRevLett.115.062501

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Direct Measurement of the Mass Difference of ¹⁶³Ho and ¹⁶³Dy Solves the Q-Value Puzzle for the Neutrino Mass Determination

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Eliseev, Sergey
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum, Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Chenmarev, S.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Physics Faculty of St.Petersburg State University;

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Filianin, P. E.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Physics Faculty of St.Petersburg State University;

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Goncharov, Mikhail
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

Novikov, Yu.N.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Physics Faculty of St.Petersburg State University;
Petersburg Nuclear Physics Institute, Gatchina;

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Rischka, Alexander
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Schüssler, R. X.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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http://link.aps.org/doi/10.1103/PhysRevLett.115.062501
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Citation

Eliseev, S., Blaum, K., Block, M., Chenmarev, S., Dorrer, H., Düllmann, C., et al. (2015). Direct Measurement of the Mass Difference of ¹⁶³Ho and ¹⁶³Dy Solves the Q-Value Puzzle for the Neutrino Mass Determination. Physical Review Letters, 115(6): 062501. doi:10.1103/PhysRevLett.115.062501.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0028-4624-0

Abstract

The atomic mass difference of ¹⁶³Ho and ¹⁶³Dy has been directly measured with the Penning-trap mass spectrometer SHIPTRAP applying the novel phase-imaging ion-cyclotron-resonance technique. Our measurement has solved the long-standing problem of large discrepancies in the Q value of the electron capture in ¹⁶³Ho determined by different techniques. Our measured mass difference shifts the current Q value of 2555(16) eV evaluated in the Atomic Mass Evaluation 2012 [G. Audi et al., Chin. Phys. C 36, 1157 (2012)] by more than 7σ to 2833(30_stat)(15_sys) eV/c². With the new mass difference it will be possible, e.g., to reach in the first phase of the ECHo experiment a statistical sensitivity to the neutrino mass below 10 eV, which will reduce its present upper limit by more than an order of magnitude.