MIMAC low energy electron-recoil discrimination measured with fast neutrons

Abstract : MIMAC (MIcro-TPC MAtrix of Chambers) is a directional WIMP Dark Matter detector project. Direct dark matter experiments need a high level of electron/recoil discrimination to search for nuclear recoils produced by WIMP-nucleus elastic scattering. In this paper, we proposed an original method for electron event rejection based on a multivariate analysis applied to experimental data acquired using monochromatic neutron fields. This analysis shows that a $10^{5}$ rejection power is reachable for electron/recoil discrimination. Moreover, the efficiency was estimated by a Monte-Carlo simulation showing that a $10^{5}$ electron rejection power is reached with a 85.1\% nuclear recoil efficiency using the same detector gain that on the detectors running at Modane.
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Submitted on : Friday, February 5, 2016 - 8:50:29 AM
Last modification on : Friday, May 10, 2019 - 1:54:12 PM

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Q. Riffard, D. Santos, O. Guillaudin, G. Bosson, O. Bourrion, et al.. MIMAC low energy electron-recoil discrimination measured with fast neutrons. Journal of Instrumentation, IOP Publishing, 2016, 11 (08), pp.P08011. ⟨10.1088/1748-0221/11/08/P08011⟩. ⟨in2p3-01269546⟩

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