Daniel Santos

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MACHe3(MAtrix of Cells of super-fluid Helium 3)
ISN (IN2P3-CNRS-UJF)- Grenoble
-France G.Duhamel, G. Perrin, F. Mayet, E. Moulin
(Ph.D), D. Santos CRTBT (SPM-CNRS) - Grenoble
-France Y. Bounkov, H. Godfrin
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Why 3He-B ?

• Spin ½ ? axial interaction
• Wider range of sensitivity to the WIMPs mass
• Very low Compton cross section
• No intrinsic X-rays
• Neutron capture ? 764 keV
• Low threshold ( lt 1 keV )
• Ultra high purity
• High signal/noise ratio ( 1- 6 keV)

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• 1 keV to Emax lt 6 keV
• High signal/noise ratio

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Cell (schematic )

• Cell (type Lancaster)
• T (µK) 100-160

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• Experimental set-up

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• Neutron capture
• ?E UV photons and

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Neutrons (10 keV) on MACHe3(10 kg) (simulation)

• Capture Elastic collisions

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• Total Rejection

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More than 30 times better than Ge for gamma
rejection
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• Threshold ? 1 keV

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Muons detection with a prototype cell
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F. Mayet et al, PLB (2002) Search for SUSY DM
with MACHe3
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Next steps

• To calibrate at low energies ( 6 keV)
• ( electron conversion source )
• Multi-cell prototype Acquisition system
• Electron-recoil discrimination exploration
• - 10?m Cu shared walls
• - UV detectors on the walls