Status report on project GRAND

TL;DR

This paper reports on the status of project GRAND, an array of muon detectors designed to measure secondary muons with high angular precision, contributing to cosmic ray and astrophysics research.

Contribution

It provides an update on the design, capabilities, and current status of the GRAND array, highlighting its high angular resolution and muon-electron discrimination features.

Findings

Array covers 82 m^2 of muon detection area.

Angular measurement accuracy of +/- 0.3 degrees.

99% muon-electron discrimination achieved.

Abstract

GRAND is an array of position sensitive proportional wire chambers (PWCs) located at 86.2 degrees W, 41.7 degrees N at an elevation of 220 m adjacent to the campus of the University of Notre Dame with 82 square meters of total muon detector area. The geometry of the PWCs allows the angles of the charged secondary muon tracks to be measured to +/- 0.3 deg in each of two orthogonal planes. Muons are 99% differentiated from electrons by means of a 51 mm steel plate in each detector.