Narrow Results

The single crystals of TlGaTe₂ were grown by the Bridgman method. The current–voltage characteristics were performed for obtained crystals and it was determined that the Poole–Frenkel effect occurs in the nonlinear region of the current in the directions parallel and perpendicular to the crystallographic axis. The calculated values of the concentration of ionized centers $N_t$, the mean free path $\lambda$, the values of the Frenkel coefficient $\beta$ and the shape of the potential well in TlGaTe₂ crystals are determined.

The diffusion process on the surface with equivalent potential wells is investigated. These wells are considered deep enough to keep the particle for longer than the correlation time. The quasi-equilibrium Boltzmann distribution is applied inside the well to calculate the escape time. This time characterizes jumps from a well to another one. The coefficient of such a diffusion is calculated as a function of temperature, shape, depth and localization of potential wells and the mass of the particles.

For the first time, we present a theoretical formulation to determine the nonrelativistic repulsive optical potential relative to neutron–nucleus interaction in terms of the s-wave coherent scattering amplitude and the radius of the nucleus which is regarded as a spherical infinite potential well. Within this context, the Fermi velocity is determined in excellent agreement with the Fermi velocity obtained from considerations relative to nuclear density obeying the Saxon–Woods distribution. Assuming this distribution, the force relative to the neutron–nucleus interaction is calculated. Aspects related to the involved chemical potential are discussed. Our results are consistent with previous work.

The product angular momentum polarization of the Cl + C₂D₆ → DCl + C₂D₅ reaction is calculated via the quasiclassical trajectory (QCT) method at the collision energy of 0.25 eV. A new London–Eyring–Polanyi–Sato (LEPS) potential energy surface (PES) is used in this reaction. There is a "late" barrier and a "deep" well on this new LEPS PES. The four polarization-dependent "generalized" differential cross sections (PDDCSs) are presented in the center-of-mass frame. In the meantime, the distributions of P(ϕ_r), P(θ_r), and P(θ_r, ϕ_r) are calculated. The calculations are in good agreement with the experimental data. In addition, the rotational alignment factors , , and in the stationary-target frame (STF) are also calculated.