Matrix Elements between Nuclear Compound States and Dynamical Enhancement of the Weak Interaction

Details Matrix Elements between Nuclear Compound States and Dynamical Enhancement of the Weak Interaction Matrix Elements between Nuclear Compound States and Dynamical Enhancement of the Weak Interaction

1997-06-04

arxiv.org/abs/nucl-th/9706014v1

Phys.Rev.Lett.70:4051-4054,1993

Physics

Nuclear Physics

Nuclear Theory

4 pages, Revtex3, no figures

Scientific paper

10.1103/PhysRevLett.70.4051

A method to calculate the mean squared matrix element of weak interaction between compound states is developed. The result is expressed in terms of matrix elements of the nucleon-nucleon strong and weak interactions times the Fermi distribution functions at finite temperature. Numerical calculations for $^{233}$Th are in excellent agreement with recent measurements of parity nonconservation effects in neutron capture. In fact, our calculations prove that the factor of dynamical enhancement (ratio of compound-nucleus effect to single-particle one) really exceeds 100, thus making it unnesessary to assume a value of the weak constant bigger than standard one ($g\simeq 10^{8} \epsilon \sim 1\div 4$).

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