Density probability, resonantly coupled

The amplitude of probability Ca(E) for the state o) to have the energy E is the product of a phase function by the square root of Da(E) = Ea a). Up to a normalization factor of the wave packet a), Da E) is the probability for the state a) to have the energy E. In the following Da E) will be called energy density or simply density. Equations (21) and (24) allow us to write the couplings between the resonances and the collision states as... 

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