Unique Signature of Dark Matter in Ancient Mica

Details Unique Signature of Dark Matter in Ancient Mica Unique Signature of Dark Matter in Ancient Mica

1997-01-28

arxiv.org/abs/astro-ph/9701215v1

Phys.Rev.Lett. 78 (1997) 1628-1631

Astronomy and Astrophysics

Astrophysics

5 pages, LaTeX, 2 figures. Accepted for publication at Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.78.1628

Mica can store (for >1 Gy) etchable tracks caused by atoms recoiling from WIMPs. Because a background from fission neutrons will eventually limit this technique, a unique signature for WIMPs in ancient mica is needed. Our motion around the center of the Galaxy causes WIMPs, unlike neutrons, to enter the mica from a preferred direction on the sky. Mica is a directional detector and despite the complex rotations that natural mica crystals make with respect to this WIMP ``wind,'' there is a substantial dependence of etch pit density on present day mica orientation.

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