Prospects of gamma-ray observations and dark matter search with CALET
Abstract
We are proposing the CALET (CALorimetric Electron Telescope) instrument for the observation of high-energy electrons and gamma rays at the Exposed Facility of the Japanese Experiment Module on the International Space Station (ISS). The CALET detector consists of an imaging calorimeter with scintillating fibers and tungsten plates, and a total absorption calorimeter with crystal scintillators. CALET has a capability to observe electrons (+positrons) in 1GeV-10TeV and gamma rays in 20MeV-10TeV with a high energy resolution of 2% at 100GeV, a good angular resolution of 0.06deg at 100GeV, and a high proton rejection power of 106. CALET has the geometrical factor of nearly 1m2sr and three-years observation is expected. Thus, CALET is a complementary gamma-ray detector with GLAST, HESS and so on. In particular, the excellent energy resolution of CALET, which is much better than GLAST or air Cherenkov telescopes over 10GeV, is ideal for detection of gamma-ray lines in the GeV-TeV region from WIMP dark matter annihilations. The high precise observations of electrons(+positrons) also enable us to detect distinctive positron features from WIMP annihilations. In this paper, we present prospects of gamma-ray observations in 20MeV-10TeV and dark matter search with CALET.
- Publication:
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International Cosmic Ray Conference
- Pub Date:
- 2008
- Bibcode:
- 2008ICRC....4..817Y