title: Direct Measurement of the Mass Difference of (163)Ho and (163)Dy Solves the Q-Value Puzzle for the Neutrino Mass Determination.
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.
authors: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors: S
authors: S
authors: Eliseev
authors: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors: K
authors: K
authors: Blaum
authors: GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany.|Helmholtz-Institut Mainz, 55099 Mainz, Germany.|Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany.
authors: M
authors: M
authors: Block
authors: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.|Physics Faculty of St.Petersburg State University, 198904 Peterhof, Russia.
authors: S
authors: S
authors: Chenmarev
authors: Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany.|Paul Scherrer Institute, 5232 Villigen, Switzerland.|Universität Bern, 3012 Bern, Switzerland.
authors: H
authors: H
authors: Dorrer
authors: GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany.|Helmholtz-Institut Mainz, 55099 Mainz, Germany.|Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany.|PRISMA Cluster of Excellence, Johannes Gutenberg-Universität, 55099 Mainz, Germany.
authors: Ch E
authors: ChE
authors: Düllmann
authors: Kirchhoff Institut für Physik, Heidelberg Universität, INF 227, 69120 Heidelberg, Germany.
authors: C
authors: C
authors: Enss
authors: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.|Physics Faculty of St.Petersburg State University, 198904 Peterhof, Russia.
authors: P E
authors: PE
authors: Filianin
authors: Kirchhoff Institut für Physik, Heidelberg Universität, INF 227, 69120 Heidelberg, Germany.
authors: L
authors: L
authors: Gastaldo
authors: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors: M
authors: M
authors: Goncharov
authors: Institut Laue-Langevin, 38042 Grenoble, France.
authors: U
authors: U
authors: Köster
authors: GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany.
authors: F
authors: F
authors: Lautenschläger
authors: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.|Physics Faculty of St.Petersburg State University, 198904 Peterhof, Russia.|Petersburg Nuclear Physics Institute, Gatchina, 188300 St. Petersburg, Russia.
authors: Yu N
authors: YN
authors: Novikov
authors: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors: A
authors: A
authors: Rischka
authors: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors: R X
authors: RX
authors: Schüssler
authors: Institut für Physik, Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany.
authors: L
authors: L
authors: Schweikhard
authors: Paul Scherrer Institute, 5232 Villigen, Switzerland.|Universität Bern, 3012 Bern, Switzerland.
authors: A
authors: A
authors: Türler