12-16 September 2016
CERN
Europe/Zurich timezone
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GRAPES-3 sensitivity for diffuse gamma-ray studies with expanded muon detector

14 Sep 2016, 14:00
4h
500/1-201 - Mezzanine (CERN)

500/1-201 - Mezzanine

CERN

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Poster Contributions Cosmic rays Poster Session (coffee at 15:00) & CERN Visit

Speaker

PRAVATA MOHANTY (Tata Institute of Fundamental Research, Mumbai, India)

Description

Extensive air shower (EAS) arrays with muon identification capability are ideal
to investigate diffuse $\gamma$-rays at multi-TeV energies. The GRAPES-3
experiment at Ooty in India is equipped with a dense array of 400 scintillator
detectors and a large area (560 m$^2$) tracking compact muon detector. It is
designed to investigate $\gamma$-rays and cosmic ray nuclear composition in the
energy range of 10$^{13}$ - 10$^{16}$ eV. The muon content in EAS is an
effective parameter to discriminate the tiny flux of $\gamma$-rays from the
overwhelming background of charged cosmic rays. The GRAPES-3 group is
constructing another 560~m$^2$ area muon detector close to the existing one.
With the area getting doubled, a significant enhancement in the rejection of
cosmic ray background is expected to be achieved. We carried out a detailed Monte Carlo
simulation to compute the cosmic ray rejection efficiency and estimated
the GRAPES-3 sensitivity for diffuse $\gamma$-ray detection. In this meeting,
the results from the simulation study will be presented and the construction
status of the muon detector will be updated.

Primary author

PRAVATA MOHANTY (Tata Institute of Fundamental Research, Mumbai, India)

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