PARUPM: A simulation code for passive auto-catalytic recombiners Araceli Domínguez-Bugarín, Miguel-Ángel Jiménez, Ernst-Arndt Reinecke and Gonzalo Jiménez EPJ Nuclear Sci. Technol., 8 (2022) 32 Published online: 22 November 2022 DOI: 10.1051/epjn/2022046