Design and simulation of proton energy degrader for PIXE on 13 MeV cyclotron using PHITS - Rasito Tursinah; Kasmudin; Hengki Wibowo; Ismet Isnaini; Mujamilah; Ahadi Damar Prasetya; Rhakamerta Hijazi; Haryo Seno; Nazly Kurniawan; Adli Muhaimin; Ari Satmoko; Hana Subhiyah; et al. (Annals of Nuclear Energy, 2026)