F. Fratini,
S. Trotsenko,
S. Tashenov,
T. Stöhlker,
and A. Surzhykov

Phys. Rev. A,

**Photon-photon polarization correlations as a tool for studying parity nonconservation in heliumlike uranium**Phys. Rev. A,

**83**:052505 (May 2011)## Abstract:

Due to electron-nucleus weak interaction, atomic bound states with different parities turn out to be mixed. We discuss a prospective method for measuring the mixing parameter between the nearly degenerate metastable states 1s_(1/2) 2s_(1/2):J=0 and 1s_(1/2) 2p_(1/2):J=0 in heliumlike uranium. Our analysis is based on the polarization properties of the photons emitted in the two-photon decays of such states.