ɪf ðə nuːtɹˈiːnoʊ ɪz ɐ mˈæsləs pˈɑːɹɾɪkəl, ðɛɹ ɪz nˈoʊ lˈoʊɚ bˈaʊnd tə ðɪ ˈɛnɚdʒi ðə nuːtɹˈiːnoʊ kæn kˈæɹi, sˌoʊ ðɪ ᵻlˈɛktɹɑːn ˈɛnɚdʒi spˈɛktɹəm ʃˌʊd ɛkstˈɛnd ˈɔːl ðə wˈeɪ tə ðɪ ˈeɪtiːn.sˈɪks kˈiː vˈiː lˈɪmɪt.
If the neutrino is a massless particle, there is no lower bound to the energy the neutrino can carry, so the electron energy spectrum should extend all the way to the 18.6 keV limit.