W. Potzel

Publications (89)48.64 Total impact

• Article: First Measurement of \theta_13 from Delayed Neutron Capture on Hydrogen in the Double Chooz Experiment

  Double Chooz Collaboration, Y. Abe, C. Aberle, J. C. dos Anjos, J. C. Barriere, M. Bergevin, A. Bernstein, T. J. C. Bezerra, L. Bezrukhov, E. Blucher, [......], C. Veyssiere, S. Wagner, H. Watanabe, B. White, C. Wiebusch, L. Winslow, M. Worcester, M. Wurm, F. Yermia, V. Zimmer
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  ABSTRACT: The Double Chooz experiment has determined the value of the neutrino oscillation parameter $\theta_{13}$ from an analysis of inverse beta decay interactions with neutron capture on hydrogen. This analysis uses a three times larger fiducial volume than the standard Double Chooz assessment, which is restricted to a region doped with gadolinium (Gd), yielding an exposure of 113.1 GW-ton-years. The data sample used in this analysis is distinct from that of the Gd analysis, and the systematic uncertainties are also largely independent, with some exceptions, such as the reactor neutrino flux prediction. A combined rate- and energy-dependent fit finds $\sin^2 2\theta_{13}=0.097\pm 0.034(stat.) \pm 0.034 (syst.)$, excluding the no-oscillation hypothesis at 2.0 \sigma. This result is consistent with previous measurements of $\sin^2 2\theta_{13}$.
  01/2013;
• Article: Direct measurement of backgrounds using reactor-off data in Double Chooz

  Y. Abe, C. Aberle, J. C. dos Anjos, J. C. Barriere, M. Bergevin, A. Bernstein, T. J. C. Bezerra, L. Bezrukhov, E. Blucher, N. S. Bowden, [......], C. Veyssiere, S. Wagner, H. Watanabe, B. White, C. Wiebusch, L. Winslow, M. Worcester, M. Wurm, F. Yermia, V. Zimmer
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  ABSTRACT: Double Chooz is unique among modern reactor-based neutrino experiments studying ν̅ e disappearance in that data can be collected with all reactors off. In this paper, we present data from 7.53 days of reactor-off running. Applying the same selection criteria as used in the Double Chooz reactor-on oscillation analysis, a measured background rate of 1.0±0.4 events/day is obtained. The background model for accidentals, cosmogenic β-n-emitting isotopes, fast neutrons from cosmic muons, and stopped-μ decays used in the oscillation analysis is demonstrated to be correct within the uncertainties. Kinematic distributions of the events, which are dominantly cosmic-ray-produced correlated-background events, are provided. The background rates are scaled to the shielding depths of two other reactor-based oscillation experiments, Daya Bay and RENO.
  Physical Review D 01/2013; 87(1):011102. · 4.56 Impact Factor
• Source

  Available from: Gustavo Amaral Valdiviesso

  Article: First test of Lorentz violation with a reactor-based antineutrino experiment

  Y. Abe, C. Aberle, J. C. dos Anjos, J. C. Barriere, M. Bergevin, A. Bernstein, T. J. C. Bezerra, L. Bezrukhov, E. Blucher, N. S. Bowden, [......], S. Wagner, H. Watanabe, B. White, C. Wiebusch, L. Winslow, M. Worcester, M. Wurm, F. Yermia, V. Zimmer, G. Valdiviesso
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  ABSTRACT: We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring a search for a sidereal time dependence of the events, is the first test of Lorentz invariance using a reactor-based antineutrino source. No sidereal variation is present in the data and the disappearance results are consistent with sidereal time independent oscillations. Under the Standard-Model Extension, we set the first limits on 14 Lorentz violating coefficients associated with transitions between electron and tau flavor, and set two competitive limits associated with transitions between electron and muon flavor.
  Physical Review D 12/2012; 86:112009. · 4.56 Impact Factor
• Source

  Available from: Gustavo Amaral Valdiviesso

  Article: Direct Measurement of Backgrounds using Reactor-Off Data in Double Chooz

  Y. Abe, C. Aberle, J. C. dos Anjos, J. C. Barriere, M. Bergevin, A. Bernstein, T. J. C. Bezerra, L. Bezrukhov, E. Blucher, N. S. Bowden, [......], C. Veyssiere, S. Wagner, H. Watanabe, B. White, C. Wiebusch, L. Winslow, M. Worcester, M. Wurm, F. Yermia, V. Zimmer
  [show abstract] [hide abstract]
  ABSTRACT: Double Chooz is unique among modern reactor-based neutrino experiments studying $\bar \nu_e$ disappearance in that data can be collected with all reactors off. In this paper, we present data from 7.53 days of reactor-off running. Applying the same selection criteria as used in the Double Chooz reactor-on oscillation analysis, a measured background rate of 1.0$\pm$0.4 events/day is obtained. The background model for accidentals, cosmogenic $\beta$-$n$-emitting isotopes, fast neutrons from cosmic muons, and stopped-$\mu$ decays used in the oscillation analysis is demonstrated to be correct within the uncertainties. Kinematic distributions of the events, which are dominantly cosmic-ray-produced correlated-background events, are provided. The background rates are scaled to the shielding depths of two other reactor-based oscillation experiments, Daya Bay and RENO.
  10/2012;
• Article: First Test of Lorentz Violation with a Reactor-based Antineutrino Experiment

  Double Chooz Collaboration, Y. Abe, C. Aberle, J. C. dos Anjos, M. Bergevin, A. Bernstein, T. J. C. Bezerra, L. Bezrukhov, E. Blucher, N. S. Bowden, [......], S. Wagner, H. Watanabe, B. White, C. Wiebusch, L. Winslow, M. Worcester, M. Wurm, E. Yanovitch, F. Yermia, V. Zimmer
  [show abstract] [hide abstract]
  ABSTRACT: We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring a search for a sidereal time dependence of the events, is the first test of Lorentz invariance using a reactor-based antineutrino source. No sidereal variation is present in the data and the disappearance results are consistent with sidereal time independent oscillations. Under the Standard-Model Extension (SME), we set the first limits on fourteen Lorentz violating coefficients associated with transitions between electron and tau flavor, and set two competitive limits associated with transitions between electron and muon flavor.
  09/2012;
• Article: Reactor $øverlinenu_e$ disappearance in the Double Chooz experiment

  Y Abe, C Aberle, J C Anjos, J C Barriere, M Bergevin, A Bernstein, T J C Bezerra, L Bezrukhov, E Blucher, N S Bowden, [......], C Veyssiere, S Wagner, H Watanabe, B White, C Wiebusch, L Winslow, M Worcester, M Wurm, F Yermia, V Zimmer
  Phys. Rev. D. 09/2012; 86(5):052008.
• Article: Reactor anti-neutrino disappearance in the Double Chooz experiment

  Y Abe, C Aberle, J C Anjos, J C Barriere, M Bergevin, A Bernstein, T J C Bezerra, L Bezrukhov, E Blucher, N S Bowden, [......], C Veyssiere, S Wagner, H Watanabe, B White, C Wiebusch, L Winslow, M Worcester, M Wurm, F Yermia, V Zimmer
  Phys. Rev. D. 09/2012; 86(5):052008.
• Article: Reactor electron antineutrino disappearance in the Double Chooz experiment

  Y. Abe, C. Aberle, J. C. dos Anjos, J. C. Barriere, M. Bergevin, A. Bernstein, T. J. C. Bezerra, L. Bezrukhov, E. Blucher, N. S. Bowden, [......], C. Veyssiere, S. Wagner, H. Watanabe, B. White, C. Wiebusch, L. Winslow, M. Worcester, M. Wurm, F. Yermia, V. Zimmer
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  ABSTRACT: The Double Chooz experiment has observed 8,249 candidate electron antineutrino events in 227.93 live days with 33.71 GW-ton-years (reactor power x detector mass x livetime) exposure using a 10.3 cubic meter fiducial volume detector located at 1050 m from the reactor cores of the Chooz nuclear power plant in France. The expectation in case of theta13 = 0 is 8,937 events. The deficit is interpreted as evidence of electron antineutrino disappearance. From a rate plus spectral shape analysis we find sin^2 2{\theta}13 = 0.109 \pm 0.030(stat) \pm 0.025(syst). The data exclude the no-oscillation hypothesis at 99.8% CL (2.9{\sigma}).
  07/2012;
• Article: Influence of Annealing on the Optical and Scintillation Properties of CaWO$_4$ Single Crystals

  M. v. Sivers, C. Ciemniak, A. Erb, F. v. Feilitzsch, A. Gütlein, J. -C. Lanfranchi, J. Lepelmeier, A. Münster, W. Potzel, S. Roth, R. Strauss, U. Thalhammer, S. Wawoczny, M. Willers, A. Zöller
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  ABSTRACT: We investigate the influence of oxygen annealing on the room temperature optical and scintillation properties of CaWO$_4$ single crystals that are being produced for direct Dark Matter search experiments. The applied annealing procedure reduces the absorption coefficient at the peak position of the scintillation spectrum ($\sim430$ nm) by a factor of $\sim6$ and leads to an even larger reduction of the scattering coefficient. Furthermore, the annealing has no significant influence on the \emph{intrinsic} light yield. An additional absorption occurring at $\sim400$ nm suggests the formation of O$^-$ hole centers. Light-yield measurements at room temperature where one crystal surface was mechanically roughened showed an increase of the \emph{measured} light yield by $\sim40 %$ and an improvement of the energy resolution at 59.5 keV by $\sim12 %$ for the annealed crystal. We ascribe this result to the reduction of the absorption coefficient while the surface roughening is needed to compensate for the also observed reduction of the scattering coefficient after annealing.
  06/2012;
• Article: The CRESST II Dark Matter Search

  Leo Stodolsky, G. Angloher, M. Bauer, I. Bavykina, A. Bento, C. Bucci, C. Ciemniak, G. Deuter, F. v. Feilitzsch, D. Hauff, [......], S. Scholl, W. Seidel, M. v. Sivers, C. Strandhagen, R. Strauss, A. Tanzke, I. Usherov, S. Wawoczny, M. Willers, A. Zoeller
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  ABSTRACT: Direct Dark Matter detection with cryodetectors is briefly discussed, with particular mention of the possibility of the identification of the recoil nucleus. Preliminary results from the CREEST II Dark Matter search, with 730 kg-days of data, are presented. Major backgrounds and methods of identifying and dealing with them are indicated.
  03/2012;
• Article: Indication of reactor ν(e) disappearance in the Double Chooz experiment.

  Y Abe, C Aberle, T Akiri, J C dos Anjos, F Ardellier, A F Barbosa, A Baxter, M Bergevin, A Bernstein, T J C Bezerra, [......], H Watanabe, B White, C Wiebusch, L Winslow, M Worcester, M Wurm, E Yanovitch, F Yermia, K Zbiri, V Zimmer
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  ABSTRACT: The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio of events of 0.944±0.016(stat)±0.040(syst) was obtained in 101 days of running at the Chooz nuclear power plant in France, with two 4.25 GW(th) reactors. The results were obtained from a single 10 m(3) fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 flux measurement after correction for differences in core composition. The deficit can be interpreted as an indication of a nonzero value of the still unmeasured neutrino mixing parameter sin(2)2θ(13). Analyzing both the rate of the prompt positrons and their energy spectrum, we find sin(2)2θ(13)=0.086±0.041(stat)±0.030(syst), or, at 90% C.L., 0.017<sin(2)2θ(13)<0.16.
  Physical Review Letters 03/2012; 108(13):131801. · 7.37 Impact Factor
• Source

  Available from: Fumihiko Suekane

  Article: Indication for the disappearance of reactor electron antineutrinos in the Double Chooz experiment

  Y. Abe, C. Aberle, T. Akiri, J. C. dos Anjos, F. Ardellier, A. F. Barbosa, A. Baxter, M. Bergevin, A. Bernstein, T. J. C. Bezerra, [......], H. Watanabe, B. White, C. Wiebusch, L. Winslow, M. Worcester, M. Wurm, E. Yanovitch, F. Yermia, K. Zbiri, V. Zimmer
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  ABSTRACT: The Double Chooz Experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. A ratio of 0.944 $\pm$ 0.016 (stat) $\pm$ 0.040 (syst) observed to predicted events was obtained in 101 days of running at the Chooz Nuclear Power Plant in France, with two 4.25 GW$_{th}$ reactors. The results were obtained from a single 10 m$^3$ fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 measurement as an anchor point. The deficit can be interpreted as an indication of a non-zero value of the still unmeasured neutrino mixing parameter \sang. Analyzing both the rate of the prompt positrons and their energy spectrum we find \sang = 0.086 $\pm$ 0.041 (stat) $\pm$ 0.030 (syst), or, at 90% CL, 0.015 $<$ \sang $\ <$ 0.16.
  12/2011;
• Source

  Available from: ArXiv

  Article: Results from 730 kg days of the CRESST-II Dark Matter Search

  G. Angloher, M Bauer, I. Bavykina, A. Bento, C. Bucci, C. Ciemniak, G. Deuter, F. von Feilitzsch, D. Hauff, P. Huff, [......], W. Seidel, M. von Sivers, L. Stodolsky, C. Strandhagen, R. Strauß, A. Tanzke, I. Usherov, S. Wawoczny, M. Willers, A. Zöller
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  ABSTRACT: The CRESST-II cryogenic Dark Matter search, aiming at detection of WIMPs via elastic scattering off nuclei in CaWO$_4$ crystals, completed 730 kg days of data taking in 2011. We present the data collected with eight detector modules, each with a two-channel readout; one for a phonon signal and the other for coincidently produced scintillation light. The former provides a precise measure of the energy deposited by an interaction, and the ratio of scintillation light to deposited energy can be used to discriminate different types of interacting particles and thus to distinguish possible signal events from the dominant backgrounds. Sixty-seven events are found in the acceptance region where a WIMP signal in the form of low energy nuclear recoils would be expected. We estimate background contributions to this observation from four sources: 1) "leakage" from the e/\gamma-band 2) "leakage" from the \alpha-particle band 3) neutrons and 4) Pb-206 recoils from Po-210 decay. Using a maximum likelihood analysis, we find, at a high statistical significance, that these sources alone are not sufficient to explain the data. The addition of a signal due to scattering of relatively light WIMPs could account for this discrepancy, and we determine the associated WIMP parameters.
  09/2011;
• Source

  Available from: ArXiv

  Article: Low-Temperature Light Detectors: Neganov-Luke Amplification and Calibration

  C. Isaila, C. Ciemniak, F. v. Feilitzsch, A. Gütlein, J. Kemmer, T. Lachenmaier, J. -C. Lanfranchi, S. Pfister, W. Potzel, S. Roth, M. v. Sivers, R. Strauss, W. Westphal, F. Wiest
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  ABSTRACT: The simultaneous measurement of phonons and scintillation light induced by incident particles in a scintillating crystal such as CaWO4 is a powerful technique for the active rejection of background induced by gamma's and beta's and even neutrons in direct Dark Matter searches. However, less than ~1% of the energy deposited in a CaWO4 crystal is detected as light. Thus, very sensitive light detectors are needed for an efficient event-by-event background discrimination. Due to the Neganov-Luke effect, the threshold of low-temperature light detectors based on semiconducting substrates can be improved significantly by drifting the photon-induced electron-hole pairs in an applied electric field. We present measurements with low-temperature light detectors based on this amplification mechanism. The Neganov-Luke effect makes it possible to improve the signal-to-noise ratio of our light detectors by a factor of ~9 corresponding to an energy threshold of ~21 eV. We also describe a method for an absolute energy calibration using a light-emitting diode.
  06/2011;
• Source

  Available from: ArXiv

  Article: Neutrino oscillations and uncertainty relations

  S. M. Bilenky, F. von Feilitzsch, W. Potzel
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  ABSTRACT: We show that coherent flavor neutrino states are produced (and detected) due to the momentum-coordinate Heisenberg uncertainty relation. The Mandelstam-Tamm time-energy uncertainty relation requires non-stationary neutrino states for oscillations to happen and determines the time interval (propagation length) which is necessary for that. We compare different approaches to neutrino oscillations which are based on different physical assumptions but lead to the same expression for the neutrino transition probability in standard neutrino oscillation experiments. We show that a Moessbauer neutrino experiment could allow to distinguish different approaches and we present arguments in favor of the 163Ho-163Dy system for such an experiment.
  02/2011;
• Conference Proceeding: EURECA

  H. Kraus, E. Armengaud, C. Augier, M. Bauer, N. Bechtold, A. Benoit, A. Bento, L. Berge, J. Blumer, L. Bornschein, [......], A. Torrento, L. Torres, V.I. Tretyak, I. Usherov, Ph. Veber, M. Velazquez, J.A. Villar, R. Walker, J. Wolf, E. Yakushev
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  ABSTRACT: EURECA (European Underground Rare Event Calorimeter Array) is an astro-particle physics facility aiming to directly detect galactic dark matter. The Laboratoire Souterrain de Modane has been selected as host laboratory. The EURECA collaboration unites CRESST, EDELWEISS and the Spanish-French experiment ROSEBUD, thus concentrating and focussing effort on cryogenic detector research in Europe into a single facility. EURECA will use a target mass of up to one ton, enough to explore WIMP – nucleon scalar scattering cross sections in the region of 1e(-9) – 1e(-10) picobarn. A major advantage of EURECA is the planned use of more than just one target material (multi target experiment for WIMP identification).
  Identification of Dark Matter 2010 (IDM2010), July 26-30, 2010, Montpellier, France; 12/2010
• Source

  Available from: ArXiv

  Article: Solar and Atmospheric Neutrinos: Limitations for Direct Dark Matter Searches

  A. Gütlein, W. Potzel, C. Ciemniak, F. von Feilitzsch, N. Haag, M Hofmann, C. Isaila, T. Lachenmaier, J. -C. Lanfranchi, L. Oberauer, S. Pfister, S Roth, M. von Sivers, R. Strauß, A. Zöller
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  ABSTRACT: In experiments for direct dark matter searches, neutrinos coherently scattering off nuclei can produce similar events as Weakly Interacting Massive Particles (WIMPs). To reach sensitivities better than about 10^-10 pb for the elastic WIMP nucleon spin-independent cross section in the zero-background limit, energy thresholds for nuclear recoils should be >2.05 keV for CaWO_4, >4.91 keV for Ge, >2.89 keV for Xe, >8.62 keV for Ar and >15.93 keV for Ne as target material. Atmospheric neutrinos limit the achievable sensitivity for the background-free direct dark matter search to >10^-12 pb. Comment: Version 2: Correction of a typing error
  09/2010;
• Source

  Available from: ArXiv

  Article: Solar and atmospheric neutrinos: Background sources for the direct dark matter searches

  A. Gütlein, C. Ciemniak, F. von Feilitzsch, N. Haag, M. Hofmann, C. Isaila, T. Lachenmaier, J.-C. Lanfranchi, L. Oberauer, S. Pfister, W. Potzel, S. Roth, M. von Sivers, R. Strauss, A. Zöller
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  ABSTRACT: In experiments for direct dark matter searches, neutrinos coherently scattering off nuclei can produce similar events as Weakly Interacting Massive Particles (WIMPs). The calculated count rate for solar neutrinos in such experiments is a few events per ton-year. This count rate strongly depends on the nuclear recoil energy threshold achieved in the experiments for the WIMP search. We show that solar neutrinos can be a serious background source for direct dark matter search experiments using Ge, Ar, Xe and CaWO4 as target materials. To reach sensitivities better than ∼10−10 pb for the elastic WIMP nucleon spin-independent cross section in the zero-background limit, energy thresholds for nuclear recoils should be ≳2.05 keV for CaWO4, ≳4.91 keV for Ge, ≳2.89 keV for Xe, and ≳8.62 keV for Ar as target material. Next-generation experiments should not only strive for a reduction of the present energy thresholds but mainly focus on an increase of the target mass. Atmospheric neutrinos limit the achievable sensitivity for the background-free direct dark matter search to ≳10−12 pb.
  Astroparticle Physics. 03/2010;
• Source

  Available from: Stavros Katsanevas

  Article: The LAGUNA design study-towards giant liquid based underground detectors for neutrino physics and astrophysics and proton decay searches

  Angus, A Ariga, D Autiero, A Apostu, A Badertscher, T Bennet, G Bertola, P F Bertola, O Besida, A Bettini, [......], A Tonazzo, K Urbanczyk, G Vasseur, A Williams, J Winter, K Wojutszewska, M Wurm, A Zalewska, M Zampaolo, M Zito
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  ABSTRACT: d) Horia Hulubei National Institute of RD for Physics and Nuclear Engineering, IFIN-HH, 407 Atomistilor Street, R-077125, Magurele, jud. ILFOV, PO Box MG-6, postal code RO-077125, Romania (e) ETH Zurich, 101 Raemistrasse, CH-8092 Zurich (f) The University of Sheffield (USFD), New Spring House 231, Glossop Road, Sheffield S102GW, United Kingdom (g) Lombardi Engineering Limited, via R.Simen, CH-6648, Minusio (h) Commissariat à l'Energie Atomique (CEA)/ Direction des Sciences de la Matière, 25 rue Leblanc, Paris 75015, France (i) Laboratorio Subterraneo de Canfranc (LSC), Plaza del Ayuntamiento no. 1, 22880 Canfranc (Huesca), Spain (j) Mineral and Energy Economy Research Institute of the Polish Academy of Sciences (IGSMIE-PAN), Wybickiego 7, 30-950 Krakow, Poland (k) Wroclaw University of Technology (PWr Wroclaw), ul. Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland (l) University of Bucarest (UoB), Faculty of Physics Bld.Atomistilor nr.405, Physics Platform, Magurele, Ilfov County, RO-077125, MG-11 Bucharest-Magurele, Romania (m) University of Oulu (U-OULU), 1 Pentti Kaiteran Katu, Oulu 90014, Finland (n) Technische Universität München (TUM), 21 Arcisstrasse, München 80333, Germany (o) University of Aarhus (AU), 1 Norde Ringgade, Aarhus C 8000, Denmark (p) AGT Ingegneria Srl, Perugia, 10 A via della Pallotta, Perugia 06126, Italy (q) Technodyne International Ltd., Unit16, Shakespeare Business Centre Hathaway Close, Eastleigh UK SO 50 4SR, United Kingdom (r) Kalliosuunnittelu Oy Rockplan Ltd., 2 Asemamiehenkatu, Helsinki 00520, Finland (s) University of Jyväskylä (JyU), 9 Survontie, Jyväskylä 40014, Finland (t) Cleveland Potash Limited (CPL), Boulby Mine, Loftus, Saltburn Cleveland, TS13 4UZ, UK (u) Institute of Physics, University of Silesia Uniwersytecka 4, 40-007 Katowice, Poland (v) Universidad Autonoma de Madrid (UAM), C/Einstein no. 1; Rectorado, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain (w) Max-Planck-Institute for Nuclear Physics, Heidelberg (x) KGHM CUPRUM Ltd Research and Development Centre, Pl. 1 Maja, 50-136 Wrocaw, Poland (y) IFJ Pan, H.Niewodniczaski Institute of Nuclear Physics PAN, Radzikowskiego 152, 31-342 Krakow, Poland (z) Max-Planck-Institute for Physics, Munich (A) High Energy Physics Department -A. Soltan Institute * Contribution to the Workshop "European Strategy for Future Neutrino Physics", CERN, Oct. 2009, to appear in the Proceedings.
  01/2010;
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  Available from: arxiv.org

  Article: Spectroscopy of electron-induced fluorescence in organic liquid scintillators

  T. Marrodan Undagoitia, F. von Feilitzsch, L. Oberauer, W. Potzel, A. Ulrich, J Winter, M. Wurm
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  ABSTRACT: Emission spectra of several organic liquid-scintillator mixtures which are relevant for the proposed LENA detector have been measured by exciting the medium with electrons of ~10keV. The results are compared with spectra resulting from ultraviolet light excitation. Good agreement between spectra measured by both methods has been found. Comment: 6 pages, 7 figures
  01/2010;