1259_Physics ProblemsTechnical Physics

1259_Physics ProblemsTechnical Physics - 600 P45.15...

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600 Applications of Nuclear Physics P45.15 (a) At closest approach, the electrostatic potential energy equals the total energy E . U kZ eZe r E f e == 12 bg min : E ZZ = ×⋅ × × 899 10 16 10 100 10 230 10 91 9 2 14 14 .. . . Nm C C m J 22 ej e j . (b) For both the D-D and the D-T reactions, 1 . Thus, the minimum energy required in both cases is E × F H G I K J = 1 144 14 . J MeV 1.60 10 J keV 13 . Section 45.4 in the text gives more accurate values for the critical ignition temperatures, of about 52 keV for D-D fusion and 6 keV for D-T fusion. The nuclei can fuse by tunneling. A triton moves more slowly than a deuteron at a given temperature. Then D-T collisions last longer than D-D collisions and have much greater tunneling probabilities. P45.16 (a) rrr f =+= × + = × −− DT m m 1 20 10 2 3 3 24 10 15 13 15 af (b) U ke r f e f × × = 2 9 2 15 14 8 99 10 1 60 10 324 10 710 10 444 . . C m J k e V e j (c) Conserving momentum,
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