[填空题]
Two protons are heading toward ez:;6pgf,( r;pi+ neizio b d;tach othexxfe;/;dss/(jp 0 sz*,qw i esr with equal speeds. What minimum kinetic energy must each have ifqpj;e/i szxsw0(s ,;f/x e s*d a $\pi^0$ meson is to be created in the process? (See Table 32-2.) MeV
