Update on the angular resolution of GRAPES-3 experiment based on Moon shadow analysis

SciPost Physics Proceedings Pub Date : 2023-09-29 DOI:10.21468/scipostphysproc.13.033

Diptiranjan Pattanaik, S. Ahmad, M. Chakraborty, S. R. Dugad, Umananda Dev Goswami, S. K. Gupta, B. Hariharan, Y. Hayashi, P. Jagadeesan, A. Jain, P. Jain, S. Kawakami, H. Kojima, S. Mahapatra, P. K. Mohanty, R. Moharana, Yasushi Muraki, P. K. Nayak, T. Nonaka, A. Oshima, B. P. Pant, Mohamed Rameez, K. Ramesh, L. V. Reddy, S. Shibata, Fahim Varsi, M. Zuberi

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Abstract

GRAPES-3 is an extensive air shower array located at Ooty (11.6 ^\circ ° N, 76.7 ^\circ ° E, 2200 m a.s.l.) in southern India. Recently, the angular resolution of the GRAPES-3 array has been improved by correcting the shower front curvature based on the shower size and age. Here, we present the results of the angular resolution and pointing accuracy of the array through observation of the Moon shadow. We have analyzed the data for the period of 2014-2016 containing \sim ∼ 3 \times × 10 ^9 9 air shower events with a median energy of 15 TeV. A significant improvement in the angular resolution has been observed compared to the earlier analysis by the group through the Moon shadow method and is comparable to the arrays located at a 2 km higher altitude than the GRAPES-3 experiment.

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基于月影分析的GRAPES-3实验角分辨率研究进展

GRAPES-3是位于印度南部Ooty (11.6 ^\circ°N, 76.7 ^\circ°E, 2200 m a.s.l)的大型风淋室阵列。近年来，根据阵雨的大小和年龄对阵雨锋面曲率进行校正，提高了GRAPES-3阵列的角度分辨率。本文通过对月球阴影的观测，给出了该阵列的角分辨率和指向精度的结果。我们分析了2014-2016年期间的数据，其中包含\sim ~ 3 \次× 10 ^9次风淋事件，中位能量为15 TeV。与该小组先前通过月球阴影法分析的角度分辨率相比，已经观察到一个显着的改进，并且与位于比GRAPES-3实验高2公里的阵列相当。

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