Ramsey interferometers as a test of open system evolution or a modified quantum-mechanical model Abasalt Rostami, Javad T. Firouzjaee and Mehdi Golshani Eur. Phys. J. Plus, 134 7 (2019) 327 Published online: 11 July 2019 DOI: 10.1140/epjp/i2019-12712-1