Theories for Angular Distributions in Low Energy Nuclear Reactions : A Series of Six Lectures Presented at the Lawrence Radiation Laboratory, Livermore, California, in 1958 Page: 2
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Survey of Reaction Mechanisms
I am ?oing t0 *'* lectures which will constitute a survey of some
of the essential features of nuclear reactions. The main emphasis in these
talks will be on direct interactions in which an incident particle is presumed
to interact with only one or two particles in the nucleus, in particular, we
shall emphasize the problem of inelastic scattering of nucleons on nuclei,
although l will also make a few remarks about reactions, such as stripping,
involving deuterons and heavier particles. Today I will give a survey of
nuclear reaction mechanisms, that is, a survey of the various major theories
for interpreting cross sections. In particular, I would like to say something
about the connection between direct interac;ion and the compound nucleus
mechanisms. In the next lecture we shall discuss the very simplified direct
interaction theory of Austern, Butler, and McManus.* In the simplest ver-
sion of this theory, the use of the Born approximation makes it possible to
arrive at explicit formulas for the cross sections. Although the theoretical
basis for this simple version of the theory is hot very sound, it does give
simple results and provides some theoretical data to compare with experi-
mental results. In fact, it actually works somewhat better than one might
have a right to expect. Of the following two lectures, one will deal with a
semiclassical approximation; the other will deal with experimental results,
the interpretation of these results by meant of the simple theory, and
aspects of collective excitations. The last two lectures will cover the sub-
ject of angular correlations. The first of these will deal with a derivation
of the key expressions of angular correlation theory, while in the final
lecture we <vill interpret, by means of angular correlation theory, the
angular distribution of y rays following ine lastic proton scattering.
One thing I will not say very much alout is the optical model. It has
been very fully discussed here at Livermore in the past and I think many
of you probably know much more about it than I do. I will restrict myself
to the following few simple remarks. In the optical model one uses a simple
potential well with an absorptive part to account for elastic scattering and
total reaction cross sections. In this ferm the optical model doesn't tell
us anything about the cross sections for individual reaction processes, while,
Austern, Butler and McManus, Phys. Rev. 9^, 350 (1953).
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Moszkowski, Steven A.; Benveniste, J. & Schwarcz, E. H. Theories for Angular Distributions in Low Energy Nuclear Reactions : A Series of Six Lectures Presented at the Lawrence Radiation Laboratory, Livermore, California, in 1958, report, 1958; (https://digital.library.unt.edu/ark:/67531/metadc783793/m1/2/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.