Directional Detection Rates
of Dark Matter (WIMPs)
Debasish Majumdar
Saha Institute of Nuclear Physics
Kolkata
• Rotation of galactic disc through
the halo of Dark Matter causes the
earth to experience an apparent
wind of Dark Matter
• Because of the
earth’s annual
revolution around
the sun the WIMP
flux encountered by
the earth
continually changes
over the period of
the year.
Variation due to diurnal rotation of
earth
Detectors Chosen
CS2 Detector
DRIFT Detector at Boulby
mine
Time Projection Chamber
Able to reconstruct 3D
track
(Directionality of the
track)
54 deg 33 min North
0 deg 49 min west
• CF4 Detector
• NEWAGE at
Kamioka
• Micro-TPC
• CF4 with 152 Torr.
• 36 deg 25 min North
137 deg 18 min East
Daily (and annual) variations of rates
Ratio of rates in two directions
Thank you
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