[填空题]
A free neutron can decay into a proton, 5j2dsbf(b.*gu utv bg;- kt0san electron, and a neut4:1 7psvyc)xb kyy gy,rino. Assume the neutrino's rest mass is zero, and the other masses can be found in the Table inside the front cover. Determine the total kin,p )v4 yy :cby7y1sgkxetic energy shared among the three particles when a neutron decays at rest. KE = MeV
