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Observation of the Dependence of Scintillation from Nuclear Recoils in Liquid Argon on Drift Field

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arxiv 1306.5675 v3 pith:4LNFX5CR submitted 2013-06-24 physics.ins-det hep-ex

Observation of the Dependence of Scintillation from Nuclear Recoils in Liquid Argon on Drift Field

classification physics.ins-det hep-ex
keywords liquidnuclearscintillationargonfieldlar-tpcobservationrecoils
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have exposed a dual-phase Liquid Argon Time Projection Chamber (LAr-TPC) to a low energy pulsed narrowband neutron beam, produced at the Notre Dame Institute for Structure and Nuclear Astrophysics to study the scintillation light yield of recoiling nuclei in a LAr-TPC. A liquid scintillation counter was arranged to detect and identify neutrons scattered in the LAr-TPC target and to select the energy of the recoiling nuclei. We report the observation of a significant dependence on drift field of liquid argon scintillation from nuclear recoils of 11 keV. This observation is important because, to date, estimates of the sensitivity of noble liquid TPC dark matter searches are based on the assumption that electric field has only a small effect on the light yield from nuclear recoils.

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