Quantum phase transition in symmetric quantum three-body system Anjan Sadhukhan, Santanu Mondal, Sujay Kr. Nayek and Jayanta K. Saha Eur. Phys. J. D, 75 3 (2021) 77 Published online: 02 March 2021 DOI: 10.1140/epjd/s10053-021-00084-w