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- W2028363996 abstract "Starting from an exact dispersion theory, it is shown how cross-sections for capture by various mechanisms may be extracted by appropriate specialisations of the theory. The cross-section for “compound nucleus” capture is derived by the usual assumption of random signs for matrix elements (reduced width amplitudes). It is pointed out that this cross-section reduces to the Weisskopf-Ewing formula that is commonly used only after a second assumption is made, viz. that the density of energy levels of spin I in the final nucleus is proportional to (2I+1). The cross-section for “direct” capture, which has previously been derived phenomenologically, is extracted from the exact formalism by techniques developed by Bloch and by Brown and de Dominicis for treating other kinds of direct reactions. Attention is drawn to the fact that the integrals in the matrix elements of the electromagnetic interaction should be taken to infinity, thereby incorporating a contribution from the channels besides the usual one from the nuclear interior. In the following paper, this channel contribution is shown to be very important in practice." @default.
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- W2028363996 title "Theory of radiative capture reactions" @default.
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