A new method to reconstruct the slant depth of the maximum of the longitudinal profile (XmaxXmax) of high-energy showers initiated by gamma-rays as well as their energy (E0) are presented. The method were developed for gamma rays with energies ranging from a few hundred GeV to around 10 TeV. An estimator of Xmax is obtained, event-by-event, from its correlation with the distribution of the particles' arrival time at the ground, or the signal at the ground for lower energies. An estimator of E0 is obtained, event-by-event, using a parametrization that has as inputs the total measured energy at the ground, the amount of energy contained in a region near to the shower core and the estimated Xmax. Resolutions about 40 (20) g/cm2 and about 30(20)% for, respectively, Xmax and E0 at 1 (10) TeV energies are obtained, considering vertical showers. The obtained results are auspicious and can lead to the opening of new physics avenues for large wide field-of-view gamma-ray observatories. The dependence of the resolutions with experimental conditions is discussed.
Very high energy gamma-ray; Wide-field observatory; Energy reconstruction
|Subcategory||Experimental Methods & Instrumentation|