Professor Jocelyn Monroe: Publications

Directional dark matter detection beyond the neutrino bound

Physical Review D Particles Fields Gravitation and Cosmology 90:5 (2014)

Authors:

P Grothaus, M Fairbairn, J Monroe

Abstract:

Coherent scattering of solar, atmospheric, and diffuse supernovae neutrinos creates an irreducible background for direct dark matter experiments with sensitivities to WIMP-nucleon spin-independent scattering cross sections of 10-46-10-48cm2, depending on the WIMP mass. Even if one could eliminate all other backgrounds, this "neutrino floor" will limit future experiments with projected sensitivities to cross sections as small as 10-48cm2. Direction-sensitive detectors have the potential to study dark matter beyond the neutrino bound by fitting event distributions in multiple dimensions: recoil kinetic energy, recoil track angle with respect to the sun, and event time. This work quantitatively explores the impact of direction sensitivity on the neutrino bound in dark matter direct detection.

The Dark Matter Time Projection Chamber 4Shooter directional dark matter detector: Calibration in a surface laboratory

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 755 (2014) 6-19

Authors:

JBR Battat, C Deaconu, G Druitt, R Eggleston, P Fisher, P Giampa, V Gregoric, S Henderson, I Jaegle, J Lawhorn, JP Lopez, J Monroe, KA Recine, A Strandberg, H Tomita, S Vahsen, H Wellenstein

Abstract:

The 4Shooter is a prototype dark matter detector built by the Dark Matter Time Projection Chamber (DMTPC) collaboration. The aim of the collaboration is to observe dark matter with directional sensitivity by measuring the recoil directions of nuclei struck by dark matter particles. The 4Shooter is a single time projection chamber containing CF4 gas, with both optical (CCD and photomultiplier tube) and charge readout. This paper describes the 4Shooter and presents results from the commissioning of the detector in a surface laboratory. © 2014 Elsevier B.V.

A Search for Astrophysical Burst Signals at the Sudbury Neutrino Observatory

ArXiv 1309.091 (2013)

Authors:

B Aharmim, SN Ahmed, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, B Cai, YD Chan, D Chauhan, M Chen, BT Cleveland, GA Cox, X Dai, H Deng, JA Detwiler, M DiMarco, MD Diamond, PJ Doe, G Doucas, P-L Drouin, FA Duncan, M Dunford, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JTM Goon, K Graham, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, PJ Harvey, R Hazama, WJ Heintzelman, J Heise, RL Helmer, A Hime, C Howard, M Huang, P Jagam, B Jamieson, NA Jelley, M Jerkins, KJ Keeter, JR Klein, LL Kormos, M Kos, C Kraus, CB Krauss, A Krueger, T Kutter, CCM Kyba, R Lange, J Law, IT Lawson, KT Lesko, JR Leslie, I Levine, JC Loach, R MacLellan, S Majerus, HB Mak, J Maneira, R Martin, N McCauley, AB McDonald, SR McGee, ML Miller, B Monreal, J Monroe, BG Nickel, AJ Noble, HM O'Keeffe, NS Oblath, RW Ollerhead, GD Orebi Gann, SM Oser, RA Ott, SJM Peeters, AWP Poon, G Prior, SD Reitzner, K Rielage, BC Robertson, RGH Robertson, MH Schwendener, JA Secrest, SR Seibert, O Simard, JJ Simpson, D Sinclair, P Skensved, TJ Sonley, LC Stonehill, G Tesic, N Tolich, T Tsui, R Van Berg, BA VanDevender, CJ Virtue, BL Wall, D Waller, H Wan Chan Tseung, DL Wark, PJS Watson, J Wendland, N West, JF Wilkerson, JR Wilson, JM Wouters, A Wright, M Yeh, F Zhang, K Zuber

Abstract:

The Sudbury Neutrino Observatory (SNO) has confirmed the standard solar model and neutrino oscillations through the observation of neutrinos from the solar core. In this paper we present a search for neutrinos associated with sources other than the solar core, such as gamma-ray bursters and solar flares. We present a new method for looking for temporal coincidences between neutrino events and astrophysical bursts of widely varying intensity. No correlations were found between neutrinos detected in SNO and such astrophysical sources.

Test of Lorentz and CPT violation with short baseline neutrino oscillation excesses

Physics Letters B Elsevier 718:4-5 (2013) 1303-1308

Authors:

MiniBooNE Collaboration, AA Aguilar-Arevalo, CE Anderson, AO Bazarko, SJ Brice, BC Brown, L Bugel, J Cao, L Coney, JM Conrad, DC Cox, A Curioni, R Dharmapalan, Z Djurcic, DA Finley, BT Fleming, R Ford, FG Garcia, GT Garvey, J Grange, C Green, JA Green, TL Hart, E Hawker, W Huelsnitz, 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

Background rejection in the DMTPC dark matter search using charge signals

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 696 (2012) 121-128

Authors:

JP Lopez, D Dujmic, S Ahlen, JBR Battat, C Deaconu, P Fisher, S Henderson, A Inglis, A Kaboth, J Monroe, G Sciolla, H Tomita, H Wellenstein, R Yamamoto

Abstract:

The Dark Matter Time Projection Chamber (DMTPC) collaboration is developing a low pressure gas TPC for detecting Weakly Interacting Massive Particle (WIMP)-nucleon interactions. Optical readout with CCD cameras allows for the detection of the daily modulation of the direction of the dark matter wind. In order to reach sensitivities required for WIMP detection, the detector needs to minimize backgrounds from electron recoils. This paper demonstrates that a simplified CCD analysis achieves 7.3×10 ^-5 rejection of electron recoils while a charge analysis yields an electron rejection factor of 3.3×10 ^-4 for events with ²⁴¹Am-equivalent ionization energy loss between 40 keV and 200 keV. A combined charge and CCD analysis yields a background-limited upper limit of 1.1×10 ^-5 (90% confidence level) for the rejection of γ and electron events. Backgrounds from alpha decays from the field cage are eliminated by introducing a veto electrode that surrounds the sensitive region in the TPC. CCD-specific backgrounds are reduced more than two orders of magnitude when requiring a coincidence with the charge readout. © 2012 Elsevier B.V.

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