Abstract
The "optical background" representation of Kawai, Kerman, and McVoy for the fluctuation amplitude is written in an alternate form which has certain advantages in formulating the theory of doorway states and of multistep compound reactions. We reconsider the doorway state approach of Feshbach, Kerman, and Lemmer using the present representation of the fluctuation amplitude. Finally, we use the present representation of the fluctuation amplitude for developing a theory of multistep compound reactions following the idea of chaining due to Feshbach, Kerman, and Koonin. The advantages of the present approach are emphasized in both the cases.NUCLEAR REACTIONS Optical background representation of the fluctuation amplitude, doorways, preequilibrium reactions, multistep compound reactions.
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