Professor Jocelyn Monroe: Publications

Maximum patch method for directional dark matter detection

Physical Review D Particles Fields Gravitation and Cosmology 78:1 (2008)

Authors:

S Henderson, J Monroe, P Fisher

Abstract:

Present and planned dark matter detection experiments search for WIMP-induced nuclear recoils in poorly known background conditions. In this environment, the maximum gap statistical method provides a way of setting more sensitive cross section upper limits by incorporating known signal information. We give a recipe for the numerical calculation of upper limits for planned directional dark matter detection experiments, that will measure both recoil energy and angle, based on the gaps between events in two-dimensional phase space. © 2008 The American Physical Society.

A measurement of photon production in electron avalanches in CF4

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 592:1-2 (2008) 63-72

Authors:

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

Abstract:

This paper presents a measurement of the ratio of photon to electron production and the scintillation spectrum in a popular gas for time projection chambers, carbon tetrafluoride (CF4), over the range of 200-800 nm; the ratio is measured to be 0.34 ± 0.04. This result is of particular importance for a new generation of dark matter time projection chambers with directional sensitivity which use CF4 as a fill gas. © 2008 Elsevier B.V. All rights reserved.

Erratum to: "Observation of the ''head-tail'' effect in nuclear recoils of low-energy neutrons" [Nucl. Instr. and Meth A 584 (2008) 327-333] (DOI:10.1016/j.nima.2007.10.037)

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 592:1-2 (2008) 123

Authors:

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

Compatibility of high-Δm2 νe and ν¯e neutrino oscillation searches

Physical Review D American Physical Society (APS) 78:1 (2008) 012007

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, PS Martin, G McGregor, W Metcalf, PD Meyers, F Mills, GB Mills, J Monroe, CD Moore, RH Nelson, VT Nguyen, P Nienaber, 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 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

Observation of the "head-tail" effect in nuclear recoils of low-energy neutrons

Journal of Physics Conference Series 110:6 (2008)

Authors:

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

Abstract:

We present an experimental method to determine the direction tag ("head-tail") of dark matter wind using a low-pressure time-projection chamber. We demonstrate the method by tagging the direction of the elastic nuclear recoils created in the scattering of low-energy neutrons with CF4 nuclei. The decreasing ionization rate along the recoil trajectory allows us to determine the direction of the incoming neutrons, and proves that the "head-tail" effect can be measured.

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