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Search Results: 1 - 10 of 401286 matches for " M. Dracos "
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Detecting Double Beta Decays Using Nuclear Emulsions
Marcos Dracos
Physics , 2008,
Abstract: Neutrino nature and absolute mass scale are major questions in particle physics which cannot be addressed by the present neutrino oscillation program. To answer these two questions, several neutrinoless double beta decay experiments are underway or planed for the near future. These experiments, mainly use bolometric techniques or gaseous counters coupled with scintillator detectors. The energy resolution is better in bolometric experiments but experiments coupling tracking with calorimetry have the advantage of observing the two electron tracks and remove many background sources. Here, we present a proposal of using nuclear emulsions to observe double beta decays. This technique has the advantage of precise tracking and vertexing even for low energy electrons.
The use of a high intensity neutrino beam from the ESS proton linac for measurement of neutrino CP violation and mass hierarchy
E. Baussan,M. Dracos,T. Ekelof,E. Fernandez Martinez,H. Ohman,N. Vassilopoulos
Physics , 2012,
Abstract: It is proposed to complement the ESS proton linac with equipment that would enable the production, concurrently with the production of the planned ESS beam used for neutron production, of a 5 MW beam of 10$^{23}$ 2.5 GeV protons per year in microsecond short pulses to produce a neutrino Super Beam, and to install a megaton underground water Cherenkov detector in a mine to detect $\nu_e$ appearance in the produced $\nu_\mu$ beam. Results are presented of preliminary calculations of the sensitivity to neutrino CP violation and the mass hierarchy as a function of the neutrino baseline. The results indicate that, with 8 years of data taking with an antineutrino beam and 2 years with a neutrino beam and a baseline distance of around 400 km, CP violation could be discovered at 5 $\sigma$ (3 $\sigma$) confidence level in 48% (73%) of the total CP violation angular range. With the same baseline, the neutrino mass hierarchy could be determined at 3 $\sigma$ level over most of the total CP violation angular range. There are several underground mines with a depth of more than 1000 m, which could be used for the creation of the underground site for the neutrino detector and which are situated within or near the optimal baseline range.
Study of the pulse power supply unit for the four-horn system of the CERN to Frejus neutrino super beam
E Baussan,E Bouquerel,M Dracos,G Gaudiot,F Osswald,P Poussot,N Vassilopoulos,J Wurtz,V Zeter
Physics , 2013, DOI: 10.1088/1748-0221/8/07/T07006
Abstract: The power supply studies for the four-horn system for the CERN to Fr\'ejus neutrino Super Beam oscillation experiment are discussed here. The power supply is being studied to meet the physics potential and the mega-watt (MW) power requirements of the proton driver of the Super Beam. A one-half sinusoid current waveform with a 350 kA maximum current and pulse length of 100 \mu s at 50 Hz frequency is generated and distributed to four-horns. In order to provide the necessary current needed to focus the charged mesons producing the neutrino beam, a bench of capacitors is charged at 50 Hz frequency to a +12 kV reference voltage and then discharged through a large switch to each horn via a set of strip-lines at the same rate. A current recovery stage allows to invert rapidly the negative voltage of the capacitor after the discharging stage in order to recuperate large part of the injected energy and thus to limit the power consuption. The energy recovery efficiency of that system is very high at 97%. For feasibility reasons, a modular architecture has been adopted with 8 modules connected in parallel to deliver 44 kA peak currents into the four-horn system.
Study of the performance of a large scale water-Cherenkov detector (MEMPHYS)
L. Agostino,M. Buizza-Avanzini,M. Dracos,D. Duchesneau,M. Marafini,M. Mezzetto,L. Mosca,T. Patzak,A. Tonazzo,N. Vassilopoulos
Physics , 2012, DOI: 10.1088/1475-7516/2013/01/024
Abstract: MEMPHYS (MEgaton Mass PHYSics) is a proposed large-scale water Cherenkov experiment to be performed deep underground. It is dedicated to nucleon decay searches, neutrinos from supernovae, solar and atmospheric neutrinos, as well as neutrinos from a future Super-Beam or Beta-Beam to measure the CP violating phase in the leptonic sector and the mass hierarchy. A full simulation of the detector has been performed to evaluate its performance for beam physics. The results are given in terms of "Migration Matrices" of reconstructed versus true neutrino energy, taking into account all the experimental effects.
Future large-scale water-Cherenkov detector
L. Agostino,M. Buizza-Avanzini,M. Marafini,T. Patzak,A. Tonazzo,M. Dracos,N. Vassilopoulos,D. Duchesneau,M. Mezzetto,L. Mosca
Physics , 2013, DOI: 10.1103/PhysRevSTAB.16.061001
Abstract: MEMPHYS (MEgaton Mass PHYSics) is a proposed large-scale water-Cherenkov experiment to be performed deep underground. It is dedicated to nucleon decay searches and the detection of neutrinos from supernovae, solar, and atmospheric neutrinos, as well as neutrinos from a future beam to measure the CP violating phase in the leptonic sector and the mass hierarchy. This paper provides an overview of the latest studies on the expected performance of MEMPHYS in view of detailed estimates of its physics reach, mainly concerning neutrino beams.
Target, magnetic horn and safety studies for the CERN to Frejus Super Beam
E. Baussan,M. Dracos,G. Gaudiot,B. Lepers,F. Osswald,P. Poussot,N. Vassilopoulos,J. Wurtz,V. Zeter for EUROnu WP2 group
Physics , 2011,
Abstract: In the framework of the EUROnu design study, a new design for the CERN to Frejus neutrino beam based on the SPL is under development by the WP2 group. The main challenge of this project lies with the design of a multi-MW neutrino beam facility. The horn and the decay tunnel parameters have been optimized to maximize any potential discovery. The target design, thermo-mechanical analysis, and power supply design of the horn system as well as any safety issues are being studied to meet the MW power requirements for the proton-beam.
The SPL-based Neutrino Super Beam
E. Baussan,J. Bielski,C. Bobeth,E. Bouquerel,O. Caretta,P. Cupial,T. Davenne,C. Densham,M. Dracos,M. Fitton,G. Gaudiot,M. Kozien,L. Lacny,B. Lepers,A. Longhin,P. Loveridge,F. Osswald,P. Poussot,M. Rooney,B. Skoczen,B. Szybinski,A. Ustrzycka,N. Vassilopoulos,D. Wilcox,A. Wroblewski,J. Wurtz,V. Zeter,M. Zito
Physics , 2012,
Abstract: The EUROnu Super Beam work package has studied a neutrino beam based on SPL at CERN and aimed at MEMPHYS, a large water Cherenkov detector, proposed for the Laboratoire Souterrain de Modane (Fr\'ejus tunnel, France), with a baseline of 130 km. The aim of this proposed experiment is to study the CP violation in the neutrino sector. In the study reported here, we have developed the conceptual design of the neutrino beam, especially the target and the magnetic focusing device. Indeed, this beam present several unprecedented challenges, like the high primary proton beam power (4 MW), the high repetition rate (50 Hz) and the low energy of the protons (4.5 GeV). The design is completed by a study of all the main component of the system, starting from the transport system to guide the beam to the target up to the beam dump.
A Very Intense Neutrino Super Beam Experiment for Leptonic CP Violation Discovery based on the European Spallation Source Linac: A Snowmass 2013 White Paper
E. Baussan,M. Blennow,M. Bogomilov,E. Bouquerel,J. Cederkall,P. Christiansen,P. Coloma,P. Cupial,H. Danared,C. Densham,M. Dracos,T. Ekelof,M. Eshraqi,E. Fernandez Martinez,G. Gaudiot,R. Hall-Wilton,J. -P. Koutchouk,M. Lindroos,R. Matev,D. McGinnis,M. Mezzetto,R. Miyamoto,L. Mosca,T. Ohlsson,H. Ohman,F. Osswald,S. Peggs,P. Poussot,R. Ruber,J. Y. Tang,R. Tsenov,G. Vankova-Kirilova,N. Vassilopoulos,E. Wildner,J. Wurtz
Physics , 2013, DOI: 10.1016/j.nuclphysb.2014.05.016
Abstract: Very intense neutrino beams and large neutrino detectors will be needed in order to enable the discovery of CP violation in the leptonic sector. We propose to use the proton linac of the European Spallation Source currently under construction in Lund, Sweden to deliver, in parallel with the spallation neutron production, a very intense, cost effective and high performance neutrino beam. The baseline program for the European Spallation Source linac is that it will be fully operational at 5 MW average power by 2022, producing 2 GeV 2.86 ms long proton pulses at a rate of 14 Hz. Our proposal is to upgrade the linac to 10 MW average power and 28 Hz, producing 14 pulses/s for neutron production and 14 pulses/s for neutrino production. Furthermore, because of the high current required in the pulsed neutrino horn, the length of the pulses used for neutrino production needs to be compressed to a few $\mu$s with the aid of an accumulator ring. A long baseline experiment using this Super Beam and a megaton underground Water Cherenkov detector located in existing mines 300-600 km from Lund will make it possible to discover leptonic CP violation at 5 $\sigma$ significance level in up to 50% of the leptonic Dirac CP-violating phase range. This experiment could also determine the neutrino mass hierarchy at a significance level of more than 3 $\sigma$ if this issue will not already have been settled by other experiments by then. The mass hierarchy performance could be increased by combining the neutrino beam results with those obtained from atmospheric neutrinos detected by the same large volume detector. This detector will also be used to measure the proton lifetime, detect cosmological neutrinos and neutrinos from supernova explosions. Results on the sensitivity to leptonic CP violation and the neutrino mass hierarchy are presented.
Neutrinos from Stored Muons nuSTORM: Expression of Interest
D. Adey,S. K. Agarwalla,C. M. Ankenbrandt,R. Asfandiyarov,J. J. Back,G. Barker,E. Baussan,R. Bayes,S. Bhadra,V. Blackmore,A. Blondel,S. A. Bogacz,C. Booth,S. B. Boyd,A. Bravar,S. J. Brice,A. D. Bross,F. Cadoux,H. Cease,A. Cervera,J. Cobb,D. Colling,L. Coney,A. Dobbs,J. Dobson,A. Donini,P. J. Dornan,M. Dracos,F. Dufour,R. Edgecock,J. Evans,M. A. George,T. Ghosh,A. deGouvea,J. J. Gomez-Cadenas,A. Haesler,G. Hanson,M. Geelhoed,P. F. Harrison,M. Hartz,P. Hernandez,J. A. Hernando-Morata,P. J. Hodgson,P. Huber,A. Izmaylov,Y. Karadhzov,T. Kobilarcik,J. Kopp,L. Kormos,A. Korzenev,A. Kurup,Y. Kuno,P. Kyberd,J. P. Lagrange,A. M. Laing,J. Link,A. Liu,K. R. Long,N. McCauley,K. T. McDonald,K. Mahn,C. Martin,J. Martin,O. Mena,S. R. Mishra,N. Mokhov,J. Morfin,Y. Mori,W. Murray,D. Neuffer,R. Nichol,E. Noah,M. A. Palmer,S. Parke,S. Pascoli,J. Pasternak,M. Popovic,P. Ratoff,M. Ravonel,M. Rayner,S. Ricciardi,C. Rogers,P. Rubinov,E. Santos,A. Sato,E. Scantamburlo,J. K. Sedgbeer,D. R. Smith,P. J. Smith,J. T. Sobczyk,S. Soldner-Rembold,F. J. P. Soler,M. Sorel,A. Stahl,L. Stanco,P. Stamoulis,S. Striganov,H. Tanaka,I. J. Taylor,C. Touramanis,C. D. Tunnel,Y. Uchida,N. Vassilopoulos,M. O. Wascko,A. Weber,E. Wildner,M. J. Wilking,W. Winter,U. K. Yang
Physics , 2013,
Abstract: The nuSTORM facility has been designed to deliver beams of electron and muon neutrinos from the decay of a stored muon beam with a central momentum of 3.8 GeV/c and a momentum spread of 10%. The facility is unique in that it will: serve the future long- and short-baseline neutrino-oscillation programmes by providing definitive measurements of electron-neutrino- and muon-neutrino-nucleus cross sections with percent-level precision; allow searches for sterile neutrinos of exquisite sensitivity to be carried out; and constitute the essential first step in the incremental development of muon accelerators as a powerful new technique for particle physics. Of the world's proton-accelerator laboratories, only CERN and FNAL have the infrastructure required to mount nuSTORM. Since no siting decision has yet been taken, the purpose of this Expression of Interest (EoI) is to request the resources required to: investigate in detail how nuSTORM could be implemented at CERN; and develop options for decisive European contributions to the nuSTORM facility and experimental programme wherever the facility is sited. The EoI defines a two-year programme culminating in the delivery of a Technical Design Report.
Determination of a time-shift in the OPERA set-up using high energy horizontal muons in the LVD and OPERA detectors
N. Yu. Agafonova,P. Antonioli,V. V. Ashikhmin,G. Bari,E. Bressan,L. Evans,M. Garbini,P. Giusti,A. S. Malguin,R. Persiani,V. G. Ryasny,O. G. Ryazhskaya,G. Sartorelli,E. Scapparone,M. Selvi,I. R. Shakirianova,L. Votano,H. Wenninger,V. F. Yakushev,A. Zichichi,N. Agafonova,A. Alexandrov,A. Bertolin,R. Brugnera,B. Buttner,V. Chiarella,A. Chukanov,N. D'Ambrosio,G. De Lellis,A. Di Crescenzo,D. Di Ferdinando,N. Di Marco,S. Dmitrievsky,M. Dracos,S. Dusini,J. Ebert,A. Ereditato,T. Ferber,R. A. Fini,A. Garfagnini,G. Giacomelli,C. G?llnitz,Y. Gornushkin,F. Grianti,C. Gustavino,C. Hagner,M. Hierholzer,A. Hollnagel,K. Jakovcic,C. Jollet-Meregaglia,B. Klicek,U. Kose,J. Lenkeit,A. Ljubicic,A. Longhin,A. Malgin,G. Mandrioli,V. Matveev,N. Mauri,E. Medinaceli,A. Meregaglia,M. T. Muciaccia,D. Naumov,A. Olshevsky,A. Paoloni,A. Pastore,L. Patrizii,M. Pozzato,F. Pupilli,G. Rosa,I. Rostovtseva,A. Russo,O. Ryazhskaya,A. Schembri,I. Shakirianova,A. Sheshukov,S. Simone,M. Sioli,C. Sirignano,G. Sirri,M. Spinetti,L. Stanco,M. Stipcevic,M. Tenti,F. Terranova,V. Tioukov,L. Votano,B. Wonsak,V. Yakushev,Y. Zaitsev,S. Zemskova
Physics , 2012,
Abstract: The purpose of this work is to report the measurement of a time-shift in the OPERA set-up in a totally independent way from Time Of Flight (TOF) measurements of CNGS neutrino events. The LVD and OPERA experiments are both installed in the same laboratory: LNGS. The relative position of the two detectors, separated by an average distance of ~ 160 m, allows the use of very high energy horizontal muons to cross-calibrate the timing systems of the two detectors, using a TOF technique which is totally independent from TOF of CNGS neutrino events. Indeed, the OPERA-LVD direction lies along the so-called "Teramo anomaly", a region in the Gran Sasso massif where LVD has established, many years ago, the existence of an anomaly in the mountain structure, which exhibits a low m. w. e. thickness for horizontal directions. The "abundant" high-energy horizontal muons (nearly 100 per year) going through LVD and OPERA exist because of this anomaly in the mountain orography. The total live time of the data in coincidence correspond to 1200 days from mid 2007 until March 2012. The time coincidence study of LVD and OPERA detectors is based on 306 cosmic horizontal muon events and shows the existence of a negative time shift in the OPERA set-up of the order of deltaT(AB) = - (73 \pm 9) ns when two calendar periods, A and B, are compared. This result shows a systematic effect in the OPERA timing system from August 2008 until December 2011. The size of the effect is comparable with the neutrino velocity excess recently measured by OPERA. It is probably interesting not to forget that with the MRPC technology developed by the ALICE Bologna group the TOF world record accuracy of 20 ps was reached. That technology can be implemented at LNGS for a high precision determination of TOF with the CNGS neutrino beams of an order of magnitude smaller than the value of the OPERA systematic effect.
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