Physics – Instrumentation and Detectors
Scientific paper
2007-08-17
Nucl.Instrum.Meth.A584:327-333,2008; Erratum-ibid.A592:123,2008
Physics
Instrumentation and Detectors
14 pages, 8 figures, submitted to Nucl.Instr.Meth
Scientific paper
10.1016/j.nima.2007.10.037 10.10
Directional detection of dark matter can provide unambiguous observation of dark matter interactions even in the presence of background. This article presents an experimental method to measure the direction tag ("head-tail") of the dark matter wind by detecting the scintillation light created by the elastic nuclear recoils in the scattering of dark matter particles with the detector material. The technique is demonstrated by tagging the direction of the nuclear recoils created in the scattering of low-energy neutrons with CF4 in a low-pressure time-projection chamber that is developed by the DMTPC collaboration. The measurement of the decreasing ionization rate along the recoil trajectory provides the direction tag of the incoming neutrons, and proves that the "head-tail" effect can be observed.
Ahlen Steve
Dujmic Denis
Fisher Paul
Henderson Samuel S.
Kaboth Asher
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