Accelerator Neutrinos

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Search for sterile neutrino mixing in the MINOS long-baseline experiment

ArXiv 1001.0336 (2010)
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CryoEDM: A cryogenic experiment to measure the neutron electric dipole moment

Journal of Physics: Conference Series 251:1 (2010)

Authors:

CA Baker, SN Balashov, V Francis, K Green, MGDVD Grinten, PS Iaydjiev, SN Ivanov, A Khazov, MAH Tucker, DL Wark, A Davidson, JR Grozier, M Hardiman, PG Harris, JR Karamath, K Katsika, JM Pendlebury, SJM Peeters, DB Shiers, PN Smith, CM Townsley, I Wardell, C Clarke, S Henry, H Kraus, M McCann, P Geltenbort, H Yoshiki

Abstract:

We have constructed an instrument, CryoEDM, to measure the neutron electric dipole moment to a precision of 10-28 e cm at the Institut Laue-Langevin. The main characteristic is that it is operating entirely in a cryogenic environment, at temperatures of 0.7 K within superfluid helium. Ultracold neutrons are produced in a superthermal source and stored within the superfluid in a storage cell which is held in a magnetic and electric field. NMR measurements are carried out to look for any shifts in the neutron Larmor precession frequency associated with the electric field and the neutrons are detected in-situ in the superfluid. Low temperature SQUID magnetometry is used to monitor the magnetic field. We report on the current status of the project that is now being commissioned and give an outlook on the future exploitation of the instrument. © 2010 IOP Publishing Ltd.
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Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons

European Physical Journal C 70:3 (2010) 755-785

Authors:

The ATLAS Collaboration, G Aad, B Abbott, J Abdallah, AA Abdelalim, A Abdesselam, O Abdinov, B Abi, M Abolins, H Abramowicz, H Abreu, BS Acharya, DL Adams, TN Addy, J Adelman, C Adorisio, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, H Ahmed, M Ahsan, G Aielli, T Akdogan, TPA Åkesson, G Akimoto, AV Akimov, A Aktas, MS Alam, MA Alam, J Albert, S Albrand, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, J Alison, M Aliyev, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, MG Alviggi, K Amako, C Amelung, VV Ammosov, A Amorim, G Amorós, N Amram, C Anastopoulos, T Andeen, CF Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, A Angerami, F Anghinolfi, N Anjos, A Antonaki, M Antonelli, S Antonelli, J Antos, B Antunovic, F Anulli, S Aoun, G Arabidze, I Aracena, Y Arai, ATH Arce, JP Archambault, S Arfaoui, JF Arguin, T Argyropoulos, E Arik, M Arik, AJ Armbruster, O Arnaez, C Arnault, A Artamonov, D Arutinov, M Asai, S Asai, R Asfandiyarov, S Ask, B Åsman, D Asner, L Asquith

Abstract:

The ionization signals in the liquid argon of the ATLAS electromagnetic calorimeter are studied in detail using cosmic muons. In particular, the drift time of the ionization electrons is measured and used to assess the intrinsic uniformity of the calorimeter gaps and estimate its impact on the constant term of the energy resolution. The drift times of electrons in the cells of the second layer of the calorimeter are uniform at the level of 1.3% in the barrel and 2.8% in the endcaps. This leads to an estimated contribution to the constant term of (0.290.040.05)% in the barrel and (0.540.040.06)% in the endcaps. The same data are used to measure the drift velocity of ionization electrons in liquid argon, which is found to be 4.61±0.07 mm/μs at 88.5 K and 1 kV/mm. © 2010 CERN for the benefit of the ATLAS collaboration.
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Measurement of νμ and ν¯μ induced neutral current single π0 production cross sections on mineral oil at Eν∼O (1 GeV)

Physical Review D American Physical Society (APS) 81:1 (2010) 013005

Authors:

AA Aguilar-Arevalo, CE Anderson, AO Bazarko, SJ Brice, BC Brown, L Bugel, J Cao, L Coney, JM Conrad, DC Cox, A Curioni, Z Djurcic, DA Finley, BT Fleming, R Ford, FG Garcia, GT Garvey, J Gonzales, J Grange, C Green, JA Green, TL Hart, E Hawker, R Imlay, RA Johnson, G Karagiorgi, P Kasper, T Katori, T Kobilarcik, I Kourbanis, S Koutsoliotas, EM Laird, SK Linden, JM Link, Y Liu, Y Liu, WC Louis, KBM Mahn, W Marsh, C Mauger, VT McGary, G McGregor, W Metcalf, PD Meyers, F Mills, GB Mills, J Monroe, CD Moore, J Mousseau, RH Nelson, P Nienaber, JA Nowak, B Osmanov, S Ouedraogo, RB Patterson, Z Pavlovic, D Perevalov, CC Polly, E Prebys, JL Raaf, H Ray, BP Roe, AD Russell, V Sandberg, R Schirato, D Schmitz, MH Shaevitz, FC Shoemaker, D Smith, M Soderberg, M Sorel, P Spentzouris, J Spitz, I Stancu, RJ Stefanski, M Sung, HA Tanaka, R Tayloe, M Tzanov, RG Van de Water, MO Wascko, DH White, MJ Wilking, HJ Yang, GP Zeller, ED Zimmerman
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Measurements of forward proton production with incident protons and charged pions on nuclear targets at the CERN proton synchroton

Physical Review C - Nuclear Physics 82:4 (2010)

Authors:

M Apollonio, A Artamonov, A Bagulya, G Barr, A Blondel, F Bobisut, M Bogomilov, M Bonesini, C Booth, S Borghi, S Bunyatov, J Burguet-Castell, MG Catanesi, A Cervera-Villanueva, P Chimenti, L Coney, E di Capua, U Dore, J Dumarchez, R Edgecock, M Ellis, F Ferri, U Gastaldi, S Giani, G Giannini, D Gibin, S Gilardoni, P Gorbunov, C Gößling, JJ Gómez-Cadenas, A Grant, JS Graulich, G Grégoire, V Grichine, A Grossheim, A Guglielmi, L Howlett, A Ivanchenko, V Ivanchenko, A Kayis-Topaksu, M Kirsanov, D Kolev, A Krasnoperov, J Martín-Albo, C Meurer, M Mezzetto, GB Mills, MC Morone, P Novella, D Orestano, V Palladino, J Panman, I Papadopoulos, F Pastore, S Piperov, N Polukhina, B Popov, G Prior, E Radicioni, D Schmitz, R Schroeter, G Skoro, M Sorel, E Tcherniaev, P Temnikov, V Tereschenko, A Tonazzo, L Tortora, R Tsenov, I Tsukerman, G Vidal-Sitjes, C Wiebusch, P Zucchelli

Abstract:

Measurements of the double-differential proton production cross-section d2σ/dpdΩ in the range of momentum 0.5 GeV/c p ≤ 8.0 GeV/c and angle 0.05 rad ≤ θ < 0.25 rad in collisions of charged pions and protons on beryllium, carbon, aluminium, copper, tin, tantalum, and lead are presented. The data were taken with the large acceptance HARP detector in the T9 beam line of the CERN Proton Synchrotron. Incident particles were identified by an elaborate system of beam detectors and impinged on a target of 5% of a nuclear interaction length. The tracking and identification of the produced particles was performed using the forward spectrometer of the HARP experiment. Results are obtained for the double-differential cross-sections mainly at four incident beam momenta (3, 5, 8, and 12 GeV/c). Measurements are compared with predictions of the GEANT4 and MARS Monte Carlo generators. © 2010 The American Physical Society.
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