Download e-book for iPad: Solutions to I.E. Irodovs Problems in General Physics by A. K. Singh

By A. K. Singh

ISBN-10: 812390486X

ISBN-13: 9788123904863

1 oscillation and waves. 2 optics. three atomic and nuclear physics.

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Extra info for Solutions to I.E. Irodovs Problems in General Physics

Sample text

But in the atmosphere of Chicago, it was rather easy to learn nuclear physics. She owes a great deal to very many discussions with Edward Teller, and in particular with Enrico Fermi, who was always patient and helpful. In 1948 she started to work on the magic numbers, but it took her another year to find their explanation, and several years to work out most of the consequences. The fact that Haxel, Jensen and Suess, whom she had never met, gave the same explanation at the same time helped to convince her that it was right.

Fortunately, I was not too well versed in « Bethe’s bible » and I did not remember the old arguments against a strong spin-orbit coupling too well. 48 1963 J. HANS D. JENSEN spectra in lighter nuclei, which according to the liquid drop or a similar model should have relatively small moments of inertia and therefore widely separated rotational levels. As we know today, these light nuclei, like many others, in fact show no rotational bands; Bohr’s argument was, of course, that in a picture in which single particles move independently in an average spherically symmetric potential, there was no place for a superimposed rotation of the nucleus as a whole, just as in the system ofelectrons in the atomic shells.

The magic number 20 is still explained as filling the oscillator shells up to n= 2. But beyond that the system breaks down. There is no experimental trace of a gap in the level system at the oscillator shell numbers of 40, 70 and 112, and no reason seen for the observed gaps at 28, 50 and 82, and 126. Actually, for a potential which has not the oscillator shape, but is a « square well » in character the gap in energy at the oscillator shells is no longer marked. The answer was that we had copied the atomic analogue too closely.

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Solutions to I.E. Irodovs Problems in General Physics by A. K. Singh


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