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Eliseev S, Blaum K, Block M, et al. Direct Measurement of the Mass Difference of (163)Ho and (163)Dy Solves the Q-Value Puzzle for the Neutrino Mass Determination. Phys Rev Lett. 2015;115(6):062501doi: 10.1103/PhysRevLett.115.062501.
Eliseev, S., Blaum, K., Block, M., Chenmarev, S., Dorrer, H., Düllmann, C. h. E., Enss, C., Filianin, P. E., Gastaldo, L., Goncharov, M., Köster, U., Lautenschläger, F., Novikov, Y. N., Rischka, A., Schüssler, R. X., Schweikhard, L., & Türler, A. (2015). Direct Measurement of the Mass Difference of (163)Ho and (163)Dy Solves the Q-Value Puzzle for the Neutrino Mass Determination. Physical review letters, 115(6), 062501. https://doi.org/10.1103/PhysRevLett.115.062501
Eliseev, S, et al. "Direct Measurement of the Mass Difference of (163)Ho and (163)Dy Solves the Q-Value Puzzle for the Neutrino Mass Determination." Physical review letters vol. 115,6 (2015): 062501. doi: https://doi.org/10.1103/PhysRevLett.115.062501
Eliseev S, Blaum K, Block M, Chenmarev S, Dorrer H, Düllmann ChE, Enss C, Filianin PE, Gastaldo L, Goncharov M, Köster U, Lautenschläger F, Novikov YN, Rischka A, Schüssler RX, Schweikhard L, Türler A. Direct Measurement of the Mass Difference of (163)Ho and (163)Dy Solves the Q-Value Puzzle for the Neutrino Mass Determination. Phys Rev Lett. 2015 Aug 07;115(6):062501. doi: 10.1103/PhysRevLett.115.062501. Epub 2015 Aug 05. PMID: 26296112.
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Phys Rev Lett. 2015 Aug 07;115(6):062501. doi: 10.1103/PhysRevLett.115.062501. Epub 2015 Aug 05.

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

Physical review letters

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

Affiliations

  1. Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
  2. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany.
  3. Helmholtz-Institut Mainz, 55099 Mainz, Germany.
  4. Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany.
  5. Physics Faculty of St.Petersburg State University, 198904 Peterhof, Russia.
  6. Paul Scherrer Institute, 5232 Villigen, Switzerland.
  7. Universität Bern, 3012 Bern, Switzerland.
  8. PRISMA Cluster of Excellence, Johannes Gutenberg-Universität, 55099 Mainz, Germany.
  9. Kirchhoff Institut für Physik, Heidelberg Universität, INF 227, 69120 Heidelberg, Germany.
  10. Institut Laue-Langevin, 38042 Grenoble, France.
  11. Petersburg Nuclear Physics Institute, Gatchina, 188300 St. Petersburg, Russia.
  12. Institut für Physik, Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany.

PMID: 26296112 DOI: 10.1103/PhysRevLett.115.062501

Abstract

The atomic mass difference of (163)Ho and (163)Dy 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 (163)Ho 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/c(2). 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.

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