Abstract
Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating WIMP events from neutrons, the ultimate background for dark matter direct detection. This strategy requires both a precise measurement of the energy down to a few keV and 3D reconstruction of tracks down to a few mm. The MIMAC (MIcro-tpc MAtrix of Chambers) collaboration has developed in the last years an original prototype detector based on the direct coupling of large pixelized micromegas with a special developed fast self-triggered electronics showing the feasibility of a new generation of directional detectors. The first bi-chamber prototype has been installed at Modane, underground laboratory in June 2012. The first undergournd background events, the gain stability and calibration are shown. The first spectrum of nuclear recoils showing 3D tracks coming from the radon progeny is presented.
Highlights
Directional detection of Dark Matter is based on the fact that the solar system moves with respect to the center of our galaxy [1]
Taking into account the hypothesis of the existence of a galactic halo of DM formed by WIMPs (Weakly Interacting Particles), we can expect a privileged direction for the nuclear recoils in our detector, coming from elastic collision with those WIMPs [2, 3]
In order to have a significant cross section with such low mass nuclei, we explore the axial, spin dependent, interaction on odd nuclei
Summary
Directional detection of Dark Matter is based on the fact that the solar system moves with respect to the center of our galaxy [1]. The MIMAC (MIcro-tpc MAtrix of Chambers) detector project [4] tries to get these elusive events by a double detection: ionization and track, at low gas pressure with low mass target nuclei (H, 19F ). The primary electronion pairs produced by a nuclear recoil in one chamber of the matrix are detected by driving the electrons to the grid of a bulk micromegas[7] and producing the avalanche in a very thin gap (256 μm).
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
