Vladimir Gudkov

Parity violation and related effects in neutron-induced reactions

Abstract The multi-channel multi-level nuclear reaction theory is used to give a general approach to various parity-violation effects observable in neutron-induced reactions on complex nuclei. The energy dependence and various enhancement factors of these effects are discussed and compared with experimental data on thermal and resonance neutrons. Special attention is paid to neutron-induced fission and to the information provided by these experiments.

Neutrino-deuteron reactions at solar neutrino energies

Abstract In interpreting the SNO experiments, accurate estimates of the νd reaction cross sections are of great importance. We improve the previous estimates of our group by updating some of its inputs and by taking into account the results of a recent effective-field-theoretical calculation. The new cross sections are slightly (∼1%) larger than the previously reported values. It is shown to be reasonable to assign 1% uncertainty to the νd cross sections reported here; this error estimate does not include radiative corrections, for which we refer to the literature.

On the neutron electric dipole moment in the Weinberg CP-violation model

Abstract The neutron EDM in the Weinberg CP-violation model is shown to be dominated by the neutral Higgs boson interaction and to exceed the present experimental limitations by 2–3 orders of magnitude.

Nab: Measurement principles, apparatus and uncertainties

The Nab collaboration will perform a precise measurement of a, the electron-neutrino correlation parameter, and b, the Fierz interference term in neutron beta decay, in the Fundamental Neutron Physics Beamline at the SNS, using a novel electric/magnetic field spectrometer and detector design. The experiment is aiming at the 10{sup -3} accuracy level in {Delta}a/a, and will provide an independent measurement of {lambda} = G{sub A}/G{sub V}, the ratio of axial-vector to vector coupling constants of the nucleon. Nab also plans to perform the first ever measurement of b in neutron decay, which will provide an independent limit on the tensor weak coupling.

On CP violation in nuclear reactions

Abstract The different ways of testing CP violation in nuclei are discussed. The various T -noninvariant effects in neutron induced reactions and the connection between them and CP -violating models are considered.

Nuclear electric dipole moment of three-body systems

Nuclear electric dipole moments of 3 He and 3 H are calculated using Time Reversal Invariance Violating (TRIV) potentials based on the meson exchange theory, as well as the ones derived by using pionless and pionful effective field theories, with nuclear wave functions obtained by solving Faddeev equations in configuration space for the complete Hamiltonians comprising both TRIV and realistic strong interactions. The obtained results are compared with the previous calculations of 3 He EDM and with time reversal invariance violating effects in neutron-deuteron scattering.

Neutron beta-decay in effective field theory

Radiative corrections to the lifetime and angular correlation coefficients of neutron beta-decay are evaluated in effective field theory. We also evaluate the lowest order nucleon recoil corrections, including weak-magnetism. Our results agree with those of the long-range and model-independent part of previous calculations. In an effective theory the model-dependent radiative corrections are replaced by well-defined low-energy constants. The effective field theory allows a systematic evaluation of higher order corrections to our results to the extent that the relevant low-energy constants are known.

CP-odd nucleon potential

The CP-odd nucleon potential for different models of CP violation in the one meson exchange approximation is studied. It is shown that the main contribution is due to the

General classification and analysis of neutron β-decay experiments

\pi

Analysis of networks using generalized mutual entropies

-meson exchange which leads to a simple one parameter CP-odd nucleon potential.