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

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

2007-08-17

arxiv.org/abs/0708.2370v2

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.

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