Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987cajph..65..614w&link_type=abstract
Canadian Journal of Physics (ISSN 0008-4204), vol. 65, June 1987, p. 614-625.
Physics
1
Charge Exchange, Continuous Spectra, Nuclear Structure, Scattering Cross Sections, Spin Exchange, Stellar Evolution, Stellar Physics, Supernovae
Scientific paper
The (p, n) and (n, p) charge-exchange reactions are a suitable tool in nuclear-structure studies. At intermediate energies, the interaction with the target resembles that between free nucleons, which makes the probes mostly susceptible to the spin dynamics of the nucleus. The current theoretical picture of nucleon-nucleus charge-exchange reactions is reviewed. A brief introduction to the theory of direct reactions in the impulse approximation is given. The random-phase approximation (RPA) linear response theory, which is widely used in the calculation of cross sections and related observables is then discussed. To understand correctly the shape of the continuum cross sections, a more sophisticated theory is needed. Suitable extensions of the RPA that incorporate spreading effects as well as escape effects are discussed. Charge-exchange reactions of the (n, p) type have important implications for the evolution of massive stars. The relevance for Type-II supernovae is discussed.
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