Measurement of the directional sensitivity of Dark Matter Time Projection Chamber detectors - INSPIRE

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Measurement of the directional sensitivity of Dark Matter Time Projection Chamber detectors

Cosmin Deaconu
(
- MIT, LNS
)
,
Michael Leyton
(
- MIT, LNS
)
,
Ross Corliss
(
- MIT, LNS
)
,
Gabriela Druitt
(
- Royal Holloway, U. of London
)
,
Richard Eggleston
(
- Royal Holloway, U. of London
)

May 16, 2017

13 pages

Published in:

Phys.Rev.D 95 (2017) 12, 122002

Published: Jun 14, 2017

e-Print:

1705.05965 [astro-ph.IM]

DOI:

10.1103/PhysRevD.95.122002

View in:

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Abstract: (APS)

The dark matter time projection chamber (DMTPC) is a direction-sensitive detector designed to measure the direction of recoiling F19 and C12 nuclei in low-pressure CF4 gas using optical and charge readout systems. In this paper, we employ measurements from two DMTPC detectors, with operating pressures of 30–60 torr, to develop and validate a model of the directional response and performance of such detectors as a function of recoil energy. Using our model as a benchmark, we formulate the necessary specifications for a scalable directional detector with sensitivity comparable to that of current-generation counting (nondirectional) experiments, which measure only recoil energy. Assuming the performance of existing DMTPC detectors, as well as current limits on the spin-dependent WIMP-nucleus cross section, we find that a 10–20 kg scale direction-sensitive detector is capable of correlating the measured direction of nuclear recoils with the predicted direction of incident dark matter particles and providing decisive (3σ) confirmation that a candidate signal from a nondirectional experiment was indeed induced by elastic scattering of dark matter particles off of target nuclei.

Note:

13 pages, 10 figures. Accepted for publication in Phys. Rev. D. Added color figures, switched to more compact layout, and fixed some references

recoil: energy
nucleus: recoil
dark matter: detector
sensitivity
performance
time projection chamber
fluorine
nucleus
carbon: nucleus
carbon: fluorine

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