Table of contents

The present state of the problem of dibaryon resonances is surveyed. Experimental work on dibaryon resonances in nucleon-nucleon collisions, in the photodisintegration of the deuteron, and in pion-deuteron interactions is reviewed. Emphasis is placed on resonances with an isospin T = 0. The experimental data are compared with the predictions of partial-wave analyses of inelastic reactions. The results of phase-shift analyses of nucleon-nucleon scattering are stated. Some possible new experiments for observing dibaryon resonances are discussed.

Theoretical predictions of dibaryon resonances based on quark bag models are discussed together with possible experimental manifestations of these resonances. The predicted peaks might be seen as poles of the P-matrix rather than peaks in the cross sections. The resonance interpretation of the peaks observed in the NN-system is complicated by the presence of pseudoresonances.

The behavior of dielectric glasses at low temperatures when acted on by electric and acoustic fields is discussed. The anomalous low-temperature behavior of the heat conductivity and the heat capacity is described. A phenomenological model of two-level systems in glasses arising from tunneling transitions is presented. Results are given of the experimental and theoretical studies of the phenomena of saturation, induced transparency of the medium by application of acoustic and electric pulses, and "hole-burning" in an inhomogeneously broadened line. Considerable attention is paid to discussing the experimental results on generation of coherent responses of echo signals. In order to describe the formation of phonon-echo signals in glasses, the concept is employed of spectral diffusion, which consists of a dynamic alteration of the resonance frequency. We stress both the aspects of the properties that are common with the phenomena of magnetic resonance, and the differences that arise owing to the broad spectrum of the two-level systems.