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A method to calculate the mean squared matrix element of weak interactionbetween compound states is developed. The result is expressed in terms ofmatrix elements of the nucleon-nucleon strong and weak interactions times theFermi distribution functions at finite temperature. Numerical calculations for$^{233}$Th are in excellent agreement with recent measurements of paritynonconservation effects in neutron capture. In fact, our calculations provethat the factor of dynamical enhancement (ratio of compound-nucleus effect tosingle-particle one) really exceeds 100, thus making it unnesessary to assume avalue of the weak constant bigger than standard one ($g\simeq 10^{8} \epsilon\sim 1\div 4$).Comment: 4 pages, Revtex3, no figure

Matrix elements between nuclear compound states and dynamical enhancement of the weak interaction