Chapter 11: Q4CQ (page 517)
Question:Why might a flat-bottom finite well be a better approximation of the potential well confining nucleons than a Coulomb well tapering to a lowest energy in the middle
Answer
The answer is 1287.
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Using Figure 11.14 as a guide, explain why the heaviest of naturally occurring nuclei might be inclined to emit particles but not to emit other small groups of nucleons.
The first two terms in the semi empirical binding energy formula deal solely with the internucleon attraction.
(a) Calculate the ratio of the second term to first term for . What does it say about the surface nucleons?
(b) Repeat part (a), but for .
(a) To release 100 MW of power, approximately how many uranium fissions must occur every second?
(b) How many kilograms of U-235 would have to fission in 1 year?
From the abundances and atomic masses given in Appendix I of the two naturally occurring isotopes of boron. Determine the average atomic mass of natural boron. Compare this with the value given in the periodic table of Chapter 8.
Thorium 232 is rather abundant on Earth and is now coming into use as a breeder fuel. It behaves almost exactly like uranium- 238, merely shifted by even numbers of protons and neutrons, which means that it is not the actual fission fuel. What isotope is?
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