DIFFRACTION AND NEUTRON OPTICS IN NONCENTROSYMMETRIC CRYSTALS. NEW FEASIBILITY OF A SEARCH FOR NEUTRON EDM

Recently strong electric fields (up to 10 V/cm) have been discovered, which affect the neutrons moving in noncentrosymmetric crystals. Such fields result in some new polarization phenomena observable in neutron diffraction and optics. That opens, for example, a new way for searching the electric dipole moment (EDM) of a neutron with the sensitivity comparable or exceeding that for the most sensitive now magnetic resonance method using ultra cold neutrons. Now the pilot setup for searching the neutron EDM has been created. It allows to study the dynamical diffraction and optics of polarized neutrons in thick (1–10 cm) crystals, using the direct diffraction beam and Bragg angles close to 90◦. The setup is mounted at the horizontal channel of WWR-M reactor in Gatchina. Physics of the phenomena and the first experimental results are discussed on observing new effects both in neutron Laue diffraction and neutron optics. ÄÈÔÐÀÊÖÈß È ÍÅÉÒÐÎÍÍÀß ÎÏÒÈÊÀ Â ÊÐÈÑÒÀËËÀÕ ÁÅÇ ÖÅÍÒÐÀ ÑÈÌÌÅÒÐÈÈ. ÍÎÂÀß ÂÎÇÌÎÆÍÎÑÒÜ ÏÎÈÑÊÀ ÝÄÌ ÍÅÉÒÐÎÍÀ Â. Â. Ôåäîðîâ, Â. Â. Âîðîíèí

[1]  D. Dombeck,et al.  Measurement of the neutron reflectivity for Bragg reflections off a perfect silicon crystal , 2001 .

[2]  V. Voronin,et al.  Set-up for searching a neutron EDM by the crystal-diffraction method: first measurements , 2001 .

[3]  V. Voronin,et al.  Depolarization of a neutron beam in Laue diffraction by a noncentrosymmetric crystal , 2000 .

[4]  V. Voronin,et al.  Direct measurement of the delay time for a neutron in a crystal in the case of the Laue diffraction , 2000 .

[5]  P. Iaydjiev,et al.  New experimental limit on the electric dipole moment of the neutron , 1999 .

[6]  W. Bernreuther.  CP violation , 1998, hep-ph/9808453.

[7]  V. Baryshevsky.  T-violating neutron spin rotation and spin dichroism in crystals , 1997 .

[8]  I. Khriplovich,et al.  Cp Violation Without Strangeness , 1997 .

[9]  V. Voronin,et al.  Possibility of searching for the neutron electric dipole moment using the depolarizatiton accompanying diffraction in a noncentrosymmetric crystal , 1995 .

[10]  S. Lamoreaux,et al.  Neutron electric-dipole moment, ultracold neutrons and polarized 3He , 1994 .

[11]  S. Barr.  A Review of CP violation in atoms , 1993 .

[12]  V. Voronin,et al.  On the search for neutron EDM using Laue diffraction by a crystal without a centre of symmetry , 1992 .

[13]  I. Altarev,et al.  New measurement of the electric dipole moment of the neutron , 1992 .

[14]  O. I. Sumbaev,et al.  Observation of a strong interplanar electric field in a dynamical diffraction of polarized neutrons , 1989 .

[15]  M. Forte,et al.  Neutron optical spin-orbit rotation in dynamical diffraction , 1989 .

[16]  John Ellis,et al.  Theory of the neutron electric dipole moment , 1989 .

[17]  V. G. Baryshevskii,et al.  Neutron Spin Precession and Spin Dichroism of Nonmagnetic Unpolarized Single Crystals , 1985, April 1.

[18]  M. Forte.  Neutron-optical effects sensitive to P and T symmetry violation , 1983 .

[19]  V. L. Ryabov,et al.  a Search for the Electric Dipole Moment of the Neutron , 1979 .

[20]  H. Rauch,et al.  Dynamical Neutron Diffraction and Its Application , 1978 .

[21]  D. Broadhurst.  THE NEUTRON ELECTRIC DIPOLE MOMENT ? , 1971 .

[22]  C. G. Shull,et al.  Search for a Neutron Electric Dipole Moment by a Scattering Experiment , 1967 .

[23]  G. Lüders.  Proof of the TCP theorem , 1957 .