Professor Jocelyn Monroe: Publications

Unexplained excess of electronlike events from a 1-GeV neutrino beam

Physical Review Letters 102:10 (2009)

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, 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, G McGregor, W Metcalf, PD Meyers, F Mills, GB Mills, J Monroe, CD Moore, RH Nelson, VT Nguyen, P Nienaber, JA Nowak, S Ouedraogo, RB Patterson, 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 Sodeberg, M Sorel, P Spentzouris, I Stancu, RJ Stefanski, M Sung, HA Tanaka, R Tayloe, M Tzanov, R Van De Water, MO Wascko, DH White, MJ Wilking, HJ Yang, GP Zeller, ED Zimmerman

Abstract:

The MiniBooNE Collaboration observes unexplained electronlike events in the reconstructed neutrino energy range from 200 to 475 MeV. With 6.46×1020 protons on target, 544 electronlike events are observed in this energy range, compared to an expectation of 415.2±43.4 events, corresponding to an excess of 128.8±20.4±38.3 events. The shape of the excess in several kinematic variables is consistent with being due to either νe and ν̄e charged-current scattering or νμ neutral-current scattering with a photon in the final state. No significant excess of events is observed in the reconstructed neutrino energy range from 475 to 1250 MeV, where 408 events are observed compared to an expectation of 385.9±35.7 events. © 2009 The American Physical Society.

The MiniBooNE detector

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment Elsevier 599:1 (2009) 28-46

Authors:

AA Aguilar-Arevalo, CE Anderson, LM Bartoszek, 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, 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, PS Martin, G McGregor, W Metcalf, H-O Meyer, PD Meyers, F Mills, GB Mills, J Monroe, CD Moore, RH Nelson, VT Nguyen, P Nienaber, JA Nowak, S Ouedraogo, RB Patterson, D Perevalov, CC Polly, E Prebys, JL Raaf, H Ray, BP Roe, AD Russell, V Sandberg, W Sands, R Schirato, G Schofield, D Schmitz, MH Shaevitz, FC Shoemaker, D Smith, M Soderberg, M Sorel, P Spentzouris, I Stancu, RJ Stefanski, M Sung, HA Tanaka, R Tayloe, M Tzanov, R Van de Water, MO Wascko, DH White, MJ Wilking, HJ Yang, GP Zeller, ED Zimmerman, The MiniBooNE Collaboration

The DMTPC detector

Proceedings of Science (2008)

Authors:

G Sciolla, J Battat, T Caldwell, B Cornell, D Dujmic, P Fisher, S Henderson, R Lanza, A Lee, J Lopez, A Kaboth, G Kohse, J Monroe, T Sahin, R Vanderspek, R Yamamoto, H Yegoryan, S Ahlen, D Avery, K Otis, A Roccaro, H Tomita, A Dushkin, H Wellenstein

Abstract:

Directional Dark Matter detectors have the potential of yielding an unambiguous observation of WIMPs even in presence of insidious background. In addition, by measuring the direction of the Dark Matter particles such detectors can discriminate between the various models that describe Dark Matter in our galaxy. The DMTPC detector is a novel directional DM detector consisting of a low-pressure CF4 time projection chamber with optical readout. Recent measurements proved that this technology is able to reconstruct the energy, direction, and sense of the low-energy nuclear recoils produced by neutrons from a ²⁵²Cf source, as well as efficiently reject electromagnetic backgrounds. A 10-liter DMTPC detector is ready for underground operation. A 1 m³ detector, now in the design phase, will soon allow us to improve the existing limits of SD-interactions of WIMPs on protons by over one order of magnitude.

Independent measurement of the total active 8B solar neutrino flux using an array of 3He proportional counters at the Sudbury Neutrino Observatory.

Phys Rev Lett 101:11 (2008) 111301

Authors:

B Aharmim, SN Ahmed, JF Amsbaugh, AE Anthony, J Banar, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, TJ Bowles, MC Browne, TV Bullard, TH Burritt, B Cai, YD Chan, D Chauhan, M Chen, BT Cleveland, GA Cox-Mobrand, CA Currat, X Dai, H Deng, J Detwiler, M DiMarco, PJ Doe, G Doucas, P-L Drouin, CA Duba, FA Duncan, M Dunford, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, MM Fowler, N Gagnon, JV Germani, A Goldschmidt, JTM Goon, K Graham, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, AA Hamian, GC Harper, PJ Harvey, R Hazama, KM Heeger, WJ Heintzelman, J Heise, RL Helmer, R Henning, A Hime, C Howard, MA Howe, M Huang, P Jagam, B Jamieson, NA Jelley, KJ Keeter, JR Klein, LL Kormos, M Kos, A Krüger, C Kraus, CB Krauss, T Kutter, CCM Kyba, R Lange, J Law, IT Lawson, KT Lesko, JR Leslie, JC Loach, R MacLellan, S Majerus, HB Mak, J Maneira, R Martin, K McBryde, N McCauley, AB McDonald, S McGee, C Mifflin, GG Miller, ML Miller, B Monreal, J Monroe, B Morissette, A Myers, BG Nickel, AJ Noble, NS Oblath, HM O'Keeffe, RW Ollerhead, GD Orebi Gann, SM Oser, RA Ott, SJM Peeters, AWP Poon, G Prior, SD Reitzner, K Rielage, BC Robertson, RGH Robertson, E Rollin, MH Schwendener, JA Secrest, SR Seibert, O Simard, JJ Simpson, L Sinclair, P Skensved, MWE Smith, TD Steiger, LC Stonehill, G Tesić, PM Thornewell, N Tolich, T Tsui, CD Tunnell, T Van Wechel, R Van Berg, BA VanDevender, CJ Virtue, TJ Walker, BL Wall, D Waller, H Wan Chan Tseung, J Wendland, N West, JB Wilhelmy, JF Wilkerson, JR Wilson, JM Wouters, A Wright, M Yeh, F Zhang, K Zuber, SNO Collaboration

Abstract:

The Sudbury Neutrino Observatory (SNO) used an array of 3He proportional counters to measure the rate of neutral-current interactions in heavy water and precisely determined the total active (nu_x) 8B solar neutrino flux. This technique is independent of previous methods employed by SNO. The total flux is found to be 5.54_-0.31;+0.33(stat)-0.34+0.36(syst)x10(6) cm(-2) s(-1), in agreement with previous measurements and standard solar models. A global analysis of solar and reactor neutrino results yields Deltam2=7.59_-0.21;+0.19x10(-5) eV2 and theta=34.4_-1.2;+1.3 degrees. The uncertainty on the mixing angle has been reduced from SNO's previous results.

Charge amplification concepts for direction-sensitive dark matter detectors

Astroparticle Physics 30:2 (2008) 58-64

Authors:

D Dujmic, P Fisher, G Sciolla, S Ahlen, V Dutta, S Henderson, A Kaboth, G Kohse, R Lanza, J Monroe, A Roccaro, N Skvorodnev, H Tomita, R Vanderspek, H Wellenstein, R Yamamoto

Abstract:

Direction measurement of weakly interacting massive particles in time-projection chambers can provide definite evidence of their existence and help to determine their properties. This article demonstrates several concepts for charge amplification in time-projection chambers that can be used in direction-sensitive dark matter search experiments. We demonstrate reconstruction of the "head-tail" effect for nuclear recoils above 100 keV, and discuss the detector performance in the context of dark matter detection and scaling to large detector volumes. © 2008 Elsevier B.V. All rights reserved.

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