Measurements of the response function of the PIENU NaI(Tℓ) and CsI crystal calorimeter using a monochromatic 70 MeV/c positron beam at various incidence angles are described. The experimental setup and relevant physical processes involved were simulated using Geant4 to reproduce positron energy spectra. Monte Carlo simulations were compared with experimental data across ten calorimeter-beam angles and showed good agreement. This allowed the validation of simulation parameters that were essential for precise measurements of pion decays.
@article{arxiv.2410.20559,
title = {Measurement of the response function of the PIENU calorimeter},
author = {A. Aguilar-Arevalo and M. Aoki and M. Blecher and D. I. Britton and D. A. Bryman and L. Doria and S. Cuen-Rochin and P. Gumplinger and I. Hernandez and A. Hussein and S. Ito and L. Kurchaninov and L. Littenberg and C. Malbrunot and R. E. Mischke and T. Numao and D. Protopopescu and A. Sher and T. Sullivan and D. Vavilov},
journal= {arXiv preprint arXiv:2410.20559},
year = {2024}
}