Studies of neutron detection and backgrounds with the DRIFT-IIa dark matter detector

S. Burgos, J. Forbes, C. Ghag, M. Gold, V. A. Kudryavtsev, T. B. Lawson, D. Loomba, P. Majewski, D. Muna, A. Stj. Murphy, G. G. Nicklin, S. M. Paling, A. Petkov, S. J. S. Plank, M. Robinson, N. Sanghi, N. J. T. Smith, D. P. Snowden-Ifft, N. J. C. Spooner, T. J. SumnerJ. Turk, E. Tziaferi

Research output: Contribution to journalArticlepeer-review

Abstract

Data from the DRIFT-IIa directional dark matter experiment are presented, collected during a near continuous 6 month running period. A detailed calibration analysis comparing data from gamma-ray, X-ray and neutron sources to a GEANT4 Monte Carlo simulations reveals an efficiency for detection of neutron induced recoils of 94 ± 2(stat.) ± 5(sys.)%. Software-based cuts, designed to remove non-nuclear recoil events, are shown to reject 60Co gamma-rays with a rejection factor of better than 8 × 10-6 for all energies above threshold. An unexpected event population has been discovered and is shown here to be due to the alpha-decay of 222Rn daughter nuclei that have attached to the central cathode. A limit on the flux of neutrons (
Original languageEnglish
Pages (from-to)409-421
JournalAstroparticle Physics
Volume28
Publication statusPublished - 1 Dec 2007

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