sentence2_structure: A neutron<>collides<>with an atom of u-235 during the basic nuclear fission process
sentence1: Transmutation occurs every time the nucleus of an atom changes because of natural radioactive decay, nuclear fission, nuclear fusion, neutron capture, or numerous other processes.
sentence2: A neutron collides with an atom of u-235 during the basic nuclear fission process.
question: What type of particle collides with an atom of u-235 during the basic nuclear fission process?