1. Determining the Mass Composition of Ultra High Energy Cosmic Rays Using the Principle of Shower Universality and Data from the Pierre Auger Observatory Open Access Author: Biscoveanu, Andrea Sylvia Title: Determining the Mass Composition of Ultra High Energy Cosmic Rays Using the Principle of Shower Universality and Data from the Pierre Auger Observatory Area of Honors: Physics Keywords: ultra high energy cosmic raysparticle astrophysicspierre auger observatoryshower universalityextensive air showers File: Download Biscoveanu_Sylvia_UHECRs.pdf Thesis Supervisors: Miguel Alejandro Mostafa, Thesis SupervisorDr. Richard Wallace Robinett, Thesis Honors Advisor