wˌɛn ɐ fˈɪʃən əkˈɜːz, ðə nˈʌmbɚɹ ʌv ɪmˈɜːdʒɪŋ nˈuːtɹɑːnz ɪz pɹɪdˈɪktᵻd, ænd ðə bᵻhˈeɪvjɚɹ ʌv ˈiːtʃ əv ðiːz nˈuːtɹɑːnz ɪz ᵻvˈɛntʃuːəli mˈɑːdəld ɪnðə sˈeɪm mˈænɚɹ æz ðə fˈɜːst.
When a fission occurs, the number of emerging neutrons is predicted, and the behavior of each of these neutrons is eventually modeled in the same manner as the first.