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Dark Matter Search Using High Resolution Emulsion M. University.

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Presentation on theme: "Dark Matter Search Using High Resolution Emulsion M. University."— Presentation transcript:

1 Dark Matter Search Using High Resolution Emulsion M. Natsume @Nagoya University

2 Detection of WIMP arrival direction (not annual modulation) Sun 220 km/sec Earth WIMP wind is due to Sun’s motion through our Galaxy Observe tracks of nuclear recoils from WIMP WIMP wind Detector : Nano Imaging Tracker high resolution emulsion with 40nm sized AgBr crystal Compare tracks parallel to the wind with tracks perpendicular to the wind. keep detector oriented to WIMP wind by rotating mount like equatorial telescope WIMP Maxwellian distribution

3 200 nm NIT can detect nuclear recoil from WIMP 600 nm Kr 1200km/sec (600keV) expose NIT to 84 Kr ion beam simulating 81 Br recoil Kr NIT emulsion layer 15° SEM Kr 680km/sec (200keV) TAC base

4 enlarge recoil tracks for optical recognition after development 200 nm ～ 1000 nm uniform enlargement possible ？ WIMP enlarge ! 200 nm optical image

5 Enlarge tracks of 5.3MeV alphas from Ra D-E source beforeafter 2.4 times enlargement OPERA emulsion 160μm

6 １ μm optical microscope image after enlargement electron microscope image

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