600 Applications of Nuclear PhysicsP45.15(a)At closest approach, the electrostatic potential energy equals the total energy E.UkZeZerEfe==12bgmin:EZZ=×⋅××=×−−−899 1016 10100 10230 1091921414....Nm CCmJ22ejej.(b)For both the D-D and the D-T reactions, 1. Thus, the minimum energy required inboth cases isE×FHGIKJ=−−114414. JMeV1.60 10JkeV13.Section 45.4 in the text gives more accurate values for the critical ignition temperatures, ofabout 52 keV for D-D fusion and 6 keV for D-T fusion. The nuclei can fuse by tunneling. Atriton moves more slowly than a deuteron at a given temperature. Then D-T collisions lastlonger than D-D collisions and have much greater tunneling probabilities.P45.16(a)rrrf=+=×+=×−−DTm m1 20 10233 24 10151315af(b)Ukerfef××=−−−29215148 99 101 60 10324 10710 10444..CmJ keVej(c)Conserving momentum,
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