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Home page > PhD fellowships > Previous Calls > Proposed PhD subjects 2013-2016 > Cosmic-ray propagation and dark matter indirect detection with AMS-02

Cosmic-ray propagation and dark matter indirect detection with AMS-02

by Yannis Karyotakis - 25 February 2013

Topics : Cosmic-ray propagation and dark matter indirect detection with AMS-02
Proponents : D. Maurin
Address : LPSC - 53 rue des Martyrs - 38042 Grenoble Cedex
Phone : + 33 4 76 28 40 82
Contact Email : david.maurin@lpsc.in2p3.fr


Summary

Anti-deuterons, anti-protons, and positrons in Galactic Cosmic Rays (GCR) are targets for dark matter indirect detection. Whereas recent results have shown that the anti-proton and positron fluxes can be accounted for by a standard astrophysical origin, only upper-limits exist on the anti-deuteron flux (theoretical models predict dbar/p 10-8). After 19 months of data taking, 30 billion triggers were recorded by the AMS-02 experiment on the International Space Station. This represents more than ten times the whole statistic previously accumulated since the discovery of cosmic rays one century ago.

The unprecedented precision for these data calls for a careful analysis and also requires several improvements on the modelling side:

  • Galactic propagation: AMS-02 will provide data with unprecedented accuracy in the GeV/n-TeV/n range for all Z=1-30 particles. Secondary-to-primary ratios, radioactive nuclei, primary-to-primary ratios, and elemental fluxes from AMS-02 will be used to constrain propagation parameters, in order to re-evaluate the astrophysical and exotic anti-proton and anti-deuteron fluxes.
  • AMS-02 data analysis: the combination of informations from the different sub-detectors (TOF, Tracker, RICH, TRD, ECAL) is required to identify the particle. The candidate will analyse anti-protons and anti-deuterons fluxes to search for dark matter.

Context : AMS-02 is an international collaboration, whose operating centre is based at CERN. The LPSC and LAPP, partners of the ENIGMASS LabEx participated to the construction, calibration, and test-beam of the detector. They are now involved in the data analysis.

Postscript :

Team expertise: the LPSC team has been in the AMS collaboration since 1997. The group has alsomade important contributions to GCR interpretation and phenomenology. Collaborations with the LabEx partners: · Meetings between LAPP and LPSC are already held on a monthly basis (S. Rosier-Lees is responsible of the French AMS-group) to discuss and share advances made on data analysis and calibration. · Regular meetings between LAPP/LAPTH/LPSC scientists (4 meetings in the last 16 months) are also regularly organised on the phenomenological aspects of propagation.