The cascade mechanism of electromagnetic shower evolution in a strong magnetic field is considered. It is based on the kinetic equations for distribution functions of such particles as electrons, positrons and photons. The differential-difference equations for Mellin transforms of the distribution functions are derived and solved in both adiabatic and modified adiabatic approximations. The authors calculate the differential and integral spectra of particles and other characteristics of the shower, i.e. the 'track' length, the position of the centre of gravity, the longitudinal spread, and the positions of the maxima of the distribution functions.

The polarisation effects sensitive to the neutron electric form factor GEn in deuteron electrodisintegration are analysed using the relativistic impulse approximation. We consider the scattering of longitudinally polarised electrons by a vector-polarised deuteron target. The high-energy neutrons (detected in coincidence, with scattered electrons) are emitted along the virtual photon momentum k . In this case the target polarisation should be orthogonal to k and must lie (in coplanar geometry) in the y*d+np reaction plane, y* being the virtual photon. If the target polarisation is orthogonal to the reaction plane, then in order to determine G,,, it is necessary to study the 9 dependence of the corresponding asymmetry. Some polarisation components of high-energy neutrons produced in disintegration of unpolarised deuterons by longitudinally polarised electrons are also sensitive to GEn.

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