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The angular resolution of GRAPES-3 EAS array after correction for the shower front curvature | | V.B. Jhansi
; S. Ahmad
; M. Chakraborty
; S.R. Dugad
; S.K. Gupta
; B. Hariharan
; Y. Hayashi
; P. Jagadeesan
; A. Jain
; P. Jain
; S. Kawakami
; H. Kojima
; S. Mahapatra
; P.K. Mohanty
; S.D. Morris
; P.K. Nayak
; A. Oshima
; D. Pattanaik
; P.S. Rakshe
; K. Ramesh
; B.S. Rao
; L.V. Reddy
; S. Shibata
; F. Varsi
; M. Zuberi
; | | Date: |
12 Nov 2019 | | Abstract: | The angular resolution of an extensive air shower (EAS) array plays a
critical role in determining its sensitivity for the detection of point
$gamma$-ray sources in the multi-TeV energy range. The GRAPES-3 an EAS array
located at Ooty in India (11.4$^{circ}$N, 76.7$^{circ}$E, 2200 m altitude) is
designed to study $gamma$-rays in the TeV-PeV energy range. It comprises of a
dense array of 400 plastic scintillators deployed over an area of 25000 m$^2$
and a large area (560 m$^2$) muon telescope. A new statistical method allowed
real time determination of the propagation delay of each detector in the
GRAPES-3 array. The shape of shower front is known to be curved and here the
details of a new method developed for accurate measurement of the shower front
curvature is presented. These two developments have led to a sizable
improvement in the angular resolution of GRAPES-3 array. It is shown that the
curvature depends on the size and age of an EAS. By employing two different
techniques, namely, the odd-even and the left-right methods, independent
estimates of the angular resolution are obtained. The odd-even method estimates
the best achievable resolution of the array. For obtaining the angular
resolution, the left-right method is used after implementing the size and age
dependent curvature corrections. A comparison of the angular resolution as a
function of EAS energy by these two methods shows them be virtually
indistinguishable. The angular resolution of GRAPES-3 array is 47$^{prime}$
for energies E$>$5 TeV and improves to 17$^{prime}$ at E$>$100 TeV and finally
approaching 10$^{prime}$ at E$>$500 TeV. | | Source: | arXiv, 1911.4715 | | Services: | Forum | Review | PDF | Favorites | |
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