THE HYPERFINE MUON-NUCLEUS INTERACTION AND P-ODD EFFECTS IN THE ONE-PHOTON 2S-]1S TRANSITION OF LIGHT MUONIC ATOMS

The weak interaction of neutral currents of the negative muon and a nu cleus results in P-odd correlations in the one-photon 2s --> 1s transi tion of light muonic atoms. If the standard electroweak model is used, the weak mixing of hyperfine components of the mu-atom 2s and 2p 1/2 orbits makes the main contribution to these correlations. A new mechan ism of acting the hyperfine structure on the P-odd correlations is con sidered in the present work. The fact is that the hyperfine muon-nucle us interaction mixes the 2p 1/2 and 2p 3/2 orbits effectively in light muonic atoms whose nuclei have large quadrupole moments. As a result, two new sublevels arise for each of two values F+/- = (I +/- 1/2) of the total angular mu-atom momentum (I is the nuclear spin). The contri butions of these sublevels to the P-odd correlations can be comparable with each other. The most strikes manifestation of the given effect o ccurs for berillium and boron, where the 2s and 2p 3/2 orbits may have close energies. Taking the above effect into account can lead to cons iderable modification of results against earlier calculations. In part icular, the P-odd correlations can vanish and change sign. They can be additionally increased by a factor of several tens.