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Search Results: 1 - 10 of 401231 matches for " M. Goeger "
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Letter of Intent for Double-CHOOZ: a Search for the Mixing Angle Theta13
F. Ardellier,I. Barabanov,J. C. Barriere,M. Bauer,L. Bezrukov,C. Buck,C. Cattadori,B. Courty,M. Cribier,F. Dalnoki-Veress,N. Danilov,H. de Kerret,A. Di Vacri,A. Etenko,M. Fallot,Ch. Grieb,M. Goeger,A. Guertin,T. Kirchner,Y. S. Krylov,D. Kryn,C. Hagner,W. Hampel,F. X. Hartmann,P. Huber,J. Jochum,T. Lachenmaier,Th. Lasserre,Ch. Lendvai,M. Lindner,F. Marie,J. Martino,G. Mention,A. Milsztajn,J. P. Meyer,D. Motta,L. Oberauer,M. Obolensky,L. Pandola,W. Potzel,S. Schoenert,U. Schwan,T. Schwetz,S. Scholl,L. Scola,M. Skorokhvatov,S. Sukhotin,A. Letourneau,D. Vignaud,F. von Feilitzsch,W. Winter,E. Yanovich
Physics , 2004,
Abstract: Tremendous progress has been achieved in neutrino oscillation physics during the last few years. However, the smallness of the $\t13$ neutrino mixing angle still remains enigmatic. The current best constraint comes from the CHOOZ reactor neutrino experiment $\s2t13 < 0.2$ (at 90% C.L., for $\adm2=2.0 10^{-3} \text{eV}^2$). We propose a new experiment on the same site, Double-CHOOZ, to explore the range of $\s2t13$ from 0.2 to 0.03, within three years of data taking. The improvement of the CHOOZ result requires an increase in the statistics, a reduction of the systematic error below one percent, and a careful control of the cosmic ray induced background. Therefore, Double-CHOOZ will use two identical detectors, one at $\sim$150 m and another at 1.05 km distance from the nuclear cores. The plan is to start data taking with two detectors in 2008, and to reach a sensitivity of 0.05 in 2009, and 0.03 in 2011.
The Physics Potential of the LENA Detector
Michael Wurm,Franz von Feilitzsch,Marianne Goeger-Neff,Tobias Lachenmaier,Timo Lewke,Quirin Meindl,Randolph Moellenberg,Lothar Oberauer,Juha Peltoniemi,Walter Potzel,Marc Tippmann,Juergen Winter
Physics , 2010,
Abstract: The large-volume liquid-scintillator detector LENA (Low Energy Neutrino Astronomy) has been proposed as a next-generation experiment for low-energy neutrinos. High-precision spectroscopy of solar, Supernova and geo-neutrinos provides a new access to the otherwise unobservable interiors of Earth, Sun and heavy stars. Due to the potent background discrimination, the detection of the Diffuse Supernova Neutrino Background is expected for the first time in LENA. The sensitivity of the proton lifetime for the decay into Kaon and antineutrino will be increased by an order of magnitude over existing experimental limits. Recent studies indicate that liquid-scintillator detectors are capable to reconstruct neutrino events even at GeV energies, providing the opportunity to use LENA as far detector in a long-baseline neutrino beam experiment.
Optical Scattering Lengths in Large Liquid-Scintillator Neutrino Detectors
Michael Wurm,Franz von Feilitzsch,Marianne Goeger-Neff,Martin Hofmann,Tobias Lachenmaier,Timo Lewke,Teresa Marrodan Undagoitita,Quirin Meindl,Randoplh Moellenberg,Lothar Oberauer,Walter Potzel,Marc Tippmann,Sebastian Todor,Christoph Traunsteiner,Juergen Winter
Physics , 2010, DOI: 10.1063/1.3397322
Abstract: For liquid-scintillator neutrino detectors of kiloton scale, the transparency of the organic solvent is of central importance. The present paper reports on laboratory measurements of the optical scattering lengths of the organic solvents PXE, LAB, and Dodecane which are under discussion for next-generation experiments like SNO+, Hanohano, or LENA. Results comprise the wavelength range from 415 to 440nm. The contributions from Rayleigh and Mie scattering as well as from absorption/re-emission processes are discussed. Based on the present results, LAB seems to be the preferred solvent for a large-volume detector.
A test of electric charge conservation with Borexino
Borexino Collaboration,M. Agostini,S. Appel,G. Bellini,J. Benziger,D. Bick,G. Bonfini,D. Bravo,B. Caccianiga,F. Calaprice,A. Caminata,P. Cavalcante,A. Chepurnov,D. D'Angelo,S. Davini,A. Derbin,L. Di Noto,I. Drachnev,A. Empl,A. Etenko,K. Fomenko,D. Franco,F. Gabriele,C. Galbiati,C. Ghiano,M. Giammarchi,M. Goeger-Neff,A. Goretti,M. Gromov,C. Hagner,E. Hungerford,Aldo Ianni,Andrea Ianni,K. Jedrzejczak,M. Kaiser,V. Kobychev,D. Korablev,G. Korga,D. Kryn,M. Laubenstein,B. Lehnert,E. Litvinovich,F. Lombardi,P. Lombardi,L. Ludhova,G. Lukyanchenko,I. Machulin,S. Manecki,W. Maneschg,S. Marcocci,E. Meroni,M. Meyer,L. Miramonti,M. Misiaszek,M. Montuschi,P. Mosteiro,V. Muratova,B. Neumair,L. Oberauer,M. Obolensky,F. Ortica,K. Otis,M. Pallavicini,L. Papp,L. Perasso,A. Pocar,G. Ranucci,A. Razeto,A. Re,A. Romani,R. Roncin,N. Rossi,S. Schoenert,D. Semenov,H. Simgen,M. Skorokhvatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,J. Thurn,M. Toropova,E. Unzhakov,A. Vishneva,R. B. Vogelaar,F. von Feilitzsch,H. Wang,S. Weinz,J. Winter,M. Wojcik,M. Wurm,Z. Yokley,O. Zaimidoroga,S. Zavatarelli,K. Zuber,G. Zuzel
Physics , 2015, DOI: 10.1103/PhysRevLett.115.231802
Abstract: Borexino is a liquid scintillation detector located deep underground at the Laboratori Nazionali del Gran Sasso (LNGS, Italy). Thanks to the unmatched radio-purity of the scintillator, and to the well understood detector response at low energy, a new limit on the stability of the electron for decay into a neutrino and a single mono-energetic photon was obtained. This new bound, tau > 6.6 10**28 yr at 90 % C.L., is two orders of magnitude better than the previous limit.
Measurement of neutrino flux from the primary proton--proton fusion process in the Sun with Borexino detector
O. Y. Smirnov,M. Agostini,S. Appel,G. Bellini,J. Benziger,D. Bick,G. Bonfini,D. Bravo,B. Caccianiga,F. Calaprice,A. Caminata,P. Cavalcante,A. Chepurnov,K. Choi,D. D'Angelo,S. Davini,A. Derbin,L. Di Noto,I. Drachnev,A. Empl,A. Etenko,K. Fomenko,D. Franco,F. Gabriele,C. Galbiati,C. Ghiano,M. Giammarchi,M. Goeger-Neff,A. Goretti,M. Gromov,C. Hagner,E. Hungerford,Aldo Ianni,Andrea Ianni,K. Jedrzejczak,M. Kaiser,V. Kobychev,D. Korablev,G. Korga,D. Kryn,M. Laubenstein,B. Lehnert,E. Litvinovich,F. Lombardi,P. Lombardi,L. Ludhova,G. Lukyanchenko,I. Machulin,S. Manecki,W. Maneschg,S. Marcocci,E. Meroni,M. Meyer,L. Miramonti,M. Misiaszek,P. Mosteiro,V. Muratova,B. Neumair,L. Oberauer,M. Obolensky,F. Ortica,K. Otis,L. Pagani,M. Pallavicini,L. Papp,L. Perasso,A. Pocar,G. Ranucci,A. Razeto,A. Re,A. Romani,R. Roncin,N. Rossi,S. Sch?nert,D. Semenov,H. Simgen,M. Skorokhvatov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,J. Thurn,M. Toropova,E. Unzhakov,R. B. Vogelaar,F. von Feilitzsch,H. Wang,S. Weinz,J. Winter,M. Wojcik,M. Wurm,Z. Yokley,O. Zaimidoroga,S. Zavatarelli,K. Zuber,G. Zuzel
Physics , 2015,
Abstract: Neutrino produced in a chain of nuclear reactions in the Sun starting from the fusion of two protons, for the first time has been detected in a real-time detector in spectrometric mode. The unique properties of the Borexino detector provided an oppurtunity to disentangle pp-neutrino spectrum from the background components. A comparison of the total neutrino flux from the Sun with Solar luminosity in photons provides a test of the stability of the Sun on the 10$^{5}$ years time scale, and sets a strong limit on the power production in the unknown energy sources in the Sun of no more than 4\% of the total energy production at 90\% C.L.
Low-energy (anti)neutrino physics with Borexino: Neutrinos from the primary proton-proton fusion process in the Sun
P. Mosteiro,G. Bellini,J. Benziger,D. Bick,G. Bonfini,D. Bravo,B. Caccianiga,L. Cadonati,F. Calaprice,A. Caminata,P. Cavalcante,A. Chavarria,A. Chepurnov,D. D'Angelo,S. Davini,A. Derbin,A. Empl,A. Etenko,K. Fomenko,D. Franco,F. Gabriele,C. Galbiati,S. Gazzana,C. Ghiano,M. Giammarchi,M. Goeger-Neff,A. Goretti,M. Gromov,C. Hagner,E. Hungerford,Al. Ianni,An. Ianni,V. Kobychev,D. Korablev,G. Korga,D. Kryn,M. Laubenstein,B. Lehnert,T. Lewke,E. Litvinovich,F. Lombardi,P. Lombardi,L. Ludhova,G. Lukyanchenko,I. Machulin,S. Manecki,W. Maneschg,S. Marcocci,Q. Meindl,E. Meroni,M. Meyer,L. Miramonti,M. Misiaszek,M. Montuschi,V. Muratova,L. Oberauer,M. Obolensky,F. Ortica,K. Otis,M. Pallavicini,L. Papp,L. Perasso,A. Pocar,G. Ranucci,A. Razeto,A. Re,A. Romani,N. Rossi,R. Saldanha,C. Salvo,S. Schoenert,H. Simgen,M. Skorokhvatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,D. Vignaud,R. B. Vogelaar,F. von Feilitzsch,H. Wang,J. Winter,M. Wojcik,A. Wright,M. Wurm,O. Zaimidoroga,S. Zavatarelli,K. Zuber,G. Zuzel
Physics , 2015, DOI: 10.1016/j.nuclphysbps.2015.06.023
Abstract: The Sun is fueled by a series of nuclear reactions that produce the energy that makes it shine. The primary reaction is the fusion of two protons into a deuteron, a positron and a neutrino. These neutrinos constitute the vast majority of neutrinos reaching Earth, providing us with key information about what goes on at the core of our star. Several experiments have now confirmed the observation of neutrino oscillations by detecting neutrinos from secondary nuclear processes in the Sun; this is the first direct spectral measurement of the neutrinos from the keystone proton-proton fusion. This observation is a crucial step towards the completion of the spectroscopy of pp-chain neutrinos, as well as further validation of the LMA-MSW model of neutrino oscillations.
Muon and Cosmogenic Neutron Detection in Borexino
Borexino Collaboration,G. Bellini,J. Benziger,D. Bick,S. Bonetti,M. Buizza Avanzini,B. Caccianiga,L. Cadonati,F. Calaprice,C. Carraro,A. Chavarria,A. Chepurnov,D. D'Angelo,S. Davini,A. Derbin,A. Etenko,F. von Feilitzsch,K. Fomenko,D. Franco,C. Galbiati,S. Gazzana,C. Ghiano,M. Giammarchi,M. Goeger-Neff,A. Goretti,E. Guardincerri,S. Hardy,Aldo Ianni,Andrea Ianni,M. Joyce,V. Kobychev,Y. Koshio,D. Korablev,G. Korga,D. Kryn,M. Laubenstein,C. Lendvai,T. Lewke,E. Litvinovich,B. Loer,F. Lombardi,P. Lombardi,L. Ludhova,I. Machulin,S. Manecki,W. Maneschg,G. Manuzio,Q. Meindl,E. Meroni,L. Miramonti,M. Misiaszek,D. Montanari,V. Muratova,L. Oberauer,M. Obolensky,F. Ortica,M. Pallavicini,L. Papp,L. Perasso,S. Perasso,A. Pocar,R. S. Raghavan,G. Ranucci,A. Razeto,A. Re,A. Romani,D. Rountree,A. Sabelnikov,R. Saldanha,C. Salvo,S. Sch?nert,H. Simgen,M. Skorokhvatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,D. Vignaud,R. B. Vogelaar,J. Winter,M. Wojcik,A. Wright,M. Wurm,J. Xu,O. Zaimidoroga,S. Zavatarelli,G. Zuzel
Physics , 2011, DOI: 10.1088/1748-0221/6/05/P05005
Abstract: Borexino, a liquid scintillator detector at LNGS, is designed for the detection of neutrinos and antineutrinos from the Sun, supernovae, nuclear reactors, and the Earth. The feeble nature of these signals requires a strong suppression of backgrounds below a few MeV. Very low intrinsic radiogenic contamination of all detector components needs to be accompanied by the efficient identification of muons and of muon-induced backgrounds. Muons produce unstable nuclei by spallation processes along their trajectory through the detector whose decays can mimic the expected signals; for isotopes with half-lives longer than a few seconds, the dead time induced by a muon-related veto becomes unacceptably long, unless its application can be restricted to a sub-volume along the muon track. Consequently, not only the identification of muons with very high efficiency but also a precise reconstruction of their tracks is of primary importance for the physics program of the experiment. The Borexino inner detector is surrounded by an outer water-Cherenkov detector that plays a fundamental role in accomplishing this task. The detector design principles and their implementation are described. The strategies adopted to identify muons are reviewed and their efficiency is evaluated. The overall muon veto efficiency is found to be 99.992% or better. Ad-hoc track reconstruction algorithms developed are presented. Their performance is tested against muon events of known direction such as those from the CNGS neutrino beam, test tracks available from a dedicated External Muon Tracker and cosmic muons whose angular distribution reflects the local overburden profile. The achieved angular resolution is 3-5 deg and the lateral resolution is 35-50 cm, depending on the impact parameter of the crossing muon. The methods implemented to efficiently tag cosmogenic neutrons are also presented.
Solar neutrino physics with Borexino I
L. Ludhova,G. Bellini,J. Benziger,D. Bick,G. Bonfini,D. Bravo,M. Buizza Avanzini,B. Caccianiga,L. Cadonati,F. Calaprice,C. Carraro,P. Cavalcante,A. Chavarria,D. D'Angelo,S. Davini,A. Derbin,A. Etenko,K. Fomenko,D. Franco,C. Galbiati,S. Gazzana,C. Ghiano,M. Giammarchi,M. Goeger-Nef,A. Goretti,L. Grandi,E. Guardincerri,S. Hardy,Aldo Ianni,Andrea Ianni,A. Kayunov,V. Kobychev,D. Korablev,G. Korga,Y. Koshio,D. Kryn,M. Laubenstein,T. Lewke,E. Litvinovich,B. Loer,F. Lombardi,P. Lombardi,I. Machulin,S. Manecki,W. Maneschg,G. Manuzio,Q. Meindl,E. Meroni,L. Miramonti,M. Misiaszek,D. Montanari,P. Mosteiro,V. Muratova,L. Oberauer,M. Obolenksy,F. Ortica,K. Otis,M. Pallavicini,L. Papp,L. Perasso,S. Perasso,A. Pocar,R. S. Raghavan,G. Ranucci,A. Razeto,A. Re,P. A. Romani,A. Sabelnikov,R. Saldanha,C. Salvo,S. Schoenert,H. Simgen,M. Skorokhvatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,D. Vignaud,R. B. Vogelaar,F. Von Feilitzsch,J. Winter,M. Wojcik,A. Wright,M. Wurm,J. Xu,O. Zaimidoroga,S. Zavatarelli,G. Zuzel
Physics , 2012,
Abstract: Borexino is a large-volume liquid scintillator detector installed in the underground halls of the Laboratori Nazionali del Gran Sasso in Italy. After several years of construction, data taking started in May 2007. The Borexino phase I ended after about three years of data taking. Borexino provided the first real time measurement of the $^{7}$Be solar neutrino interaction rate with accuracy better than 5% and confirmed the absence of its day-night asymmetry with 1.4% precision. This latter Borexino results alone rejects the LOW region of solar neutrino oscillation parameters at more than 8.5 $\sigma$ C.L. Combined with the other solar neutrino data, Borexino measurements isolate the MSW-LMA solution of neutrino oscillations without assuming CPT invariance in the neutrino sector. Borexino has also directly observed solar neutrinos in the 1.0-1.5 MeV energy range, leading to the first direct evidence of the $pep$ solar neutrino signal and the strongest constraint of the CNO solar neutrino flux up to date. Borexino provided the measurement of the solar $^{8}$B neutrino rate with 3 MeV energy threshold.
Solar neutrino with Borexino: results and perspectives
O. Smirnov,G. Bellini,J. Benziger,D. Bick,G. Bonfini,D. Bravo,B. Caccianiga,F. Calaprice,A. Caminata,P. Cavalcante,A. Chavarria,A. Chepurnov,D. D'Angelo,S. Davini,A. Derbin,A. Empl,A. Etenko,K. Fomenko,D. Franco,G. Fiorentini,C. Galbiati,S. Gazzana,C. Ghiano,M. Giammarchi,M. Goeger-Neff,A. Goretti,C. Hagner,E. Hungerford,Aldo Ianni,Andrea Ianni,V. Kobychev,D. Korablev,G. Korga,D. Kryn,M. Laubenstein,B. Lehnert,T. Lewke,E. Litvinovich,F. Lombardi,P. Lombardi,L. Ludhova,G. Lukyanchenko,I. Machulin,S. Manecki,W. Maneschg,F. Mantovani,S. Marcocci,Q. Meindl,E. Meroni,M. Meyer,L. Miramonti,M. Misiaszek,P. Mosteiro,V. Muratova,L. Oberauer,M. Obolensky,F. Ortica,K. Otis,M. Pallavicini,L. Papp,L. Perasso,A. Pocar,G. Ranucci,A. Razeto,A. Re,B. Ricci,A. Romani,N. Rossi,R. Saldanha,C. Salvo,S. Schoenert,H. Simgen,M. Skorokhvatov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,D. Vignaud,R. B. Vogelaar,F. von Feilitzsch,H. Wang,J. Winter,M. Wojcik,A. Wright,M. Wurm,O. Zaimidoroga,S. Zavatarelli,K. Zuber,G. Zuzel
Physics , 2014, DOI: 10.1134/S1063779615020185
Abstract: Borexino is a unique detector able to perform measurement of solar neutrinos fluxes in the energy region around 1 MeV or below due to its low level of radioactive background. It was constructed at the LNGS underground laboratory with a goal of solar $^{7}$Be neutrino flux measurement with 5\% precision. The goal has been successfully achieved marking the end of the first stage of the experiment. A number of other important measurements of solar neutrino fluxes have been performed during the first stage. Recently the collaboration conducted successful liquid scintillator repurification campaign aiming to reduce main contaminants in the sub-MeV energy range. With the new levels of radiopurity Borexino can improve existing and challenge a number of new measurements including: improvement of the results on the Solar and terrestrial neutrino fluxes measurements; measurement of pp and CNO solar neutrino fluxes; search for non-standard interactions of neutrino; study of the neutrino oscillations on the short baseline with an artificial neutrino source (search for sterile neutrino) in context of SOX project.
Recent Borexino results and prospects for the near future
D. D'Angelo,G. Bellini,J. Benziger,D. Bick,G. Bonfini,M. Buizza Avanzini,B. Caccianiga,L. Cadonati,F. Calaprice,P. Cavalcante,A. Chavarria,A. Chepurnov,S. Davini,A. Derbin,A. Empl,A. Etenko,F. von Feilitzsch,K. Fomenko,D. Franco,C. Galbiati,S. Gazzana,C. Ghiano,M. Giammarchi,M. Goeger-Neff,A. Goretti,L. Grandi,C. Hagner,E. Hungerford,Aldo Ianni,Andrea Ianni,V. Kobychev,D. Korablev,G. Korga,D. Kryn,M. Laubenstein,B. Lehnert,T. Lewke,E. Litvinovich,F. Lombardi,P. Lombardi,L. Ludhova,G. Lukyanchenko,I. Machulin,S. Manecki,W. Maneschg,G. Manuzio,Q. Meindl,E. Meroni,L. Miramonti,M. Misiaszek,P. Mosteiro,V. Muratova,L. Oberauer,M. Obolensky,F. Ortica,K. Otis,M. Pallavicini,L. Papp,L. Perasso,S. Perasso,A. Pocar,G. Ranucci,A. Razeto,A. Re,A. Romani,N. Rossi,R. Saldanha,C. Salvo,S. Schoenert,H. Simgen,M. Skorokhvatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,D. Vignaud,R. B. Vogelaar,J. Winter,M. Wojcik,A. Wright,M. Wurm,J. Xu,O. Zaimidoroga,S. Zavatarelli,K. Zuber,G. Zuzel
Physics , 2014,
Abstract: The Borexino experiment, located in the Gran Sasso National Laboratory, is an organic liquid scintillator detector conceived for the real time spectroscopy of low energy solar neutrinos. The data taking campaign phase I (2007 - 2010) has allowed the first independent measurements of 7Be, 8B and pep fluxes as well as the first measurement of anti-neutrinos from the earth. After a purification of the scintillator, Borexino is now in phase II since 2011. We review here the recent results achieved during 2013, concerning the seasonal modulation in the 7Be signal, the study of cosmogenic backgrounds and the updated measurement of geo-neutrinos. We also review the upcoming measurements from phase II data (pp, pep, CNO) and the project SOX devoted to the study of sterile neutrinos via the use of a 51Cr neutrino source and a 144Ce-144Pr antineutrino source placed in close proximity of the active material.
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