Multistability and synchronization of chaos in maps with “Internal” coupling

Bifurcation mechanisms responsible for the loss of the complete synchronization of chaos and for formation of multistability in a system with a unidirectional “internal” coupling are considered. The sequence of stages during which chaotic synchronization decays is described. A quantitative analysis of chaotic synchronization is performed.     

Mappings leading to randomization of an envelope of high-intensity spin waves

An experimental investigation was made of the transition to chaos in the self-modulation of high-intensity surface spin waves in magnetic films with nonlinearity caused by a three-magnon interaction. One-dimensional mappings leading to randomization of the envelope are constructed. It is shown that these mappings are universal and do not depend on the scenario for the transition to chaos. Pis’ma Zh. Tekh. Fiz. 24, 54–59 (August 26, 1998)     

γ-ray spectra from the radiation capture of neutrons for even-even radiating nuclei with rotational levels

Using a magnetic Compton spectrometer, we measured the spectra of the -rays arising from the capture of thermal neutrons by nuclei of gadolinium, erbium, hafnium, dysprosium and tantalum in the energy range 0.3–9 Mev. We determined the energies and the intensities of the -lines. For the first three elements, the radiating nuclei are the even-even nuclei₆₄Gd ₉₂ ¹⁵⁶ ,₆₄Gd ₉₄ ¹⁵⁸ ,₆₈Er ₁₀₀ ¹⁶⁸ and₇₂Hf ₁₀₆ ¹⁷⁸ , which have rotational structural levels close to the ground state. The peculiarity of the spectra of these nuclei is the presence of a group of closely placed intense -lines with energies of 1 Mev. These lines are absent in the case of even-odd (for example,₆₆Dy ₉₉ ¹⁶⁵ ) and odd-odd radiating nuclei (for example,₇₃Ta₁₀₉ ¹⁸²). The peculiarities of the -ray spectra noted are due to the structure of the lower nuclear levels.