Organic chemistry. History and mutual relations of universities of Russia

© 2017, Pleiades Publishing, Ltd. The review describes the history of development of organic chemistry in higher schools of Russia over a period of 170 years, since the emergence of organic chemistry in our country till now

Single-particle structure of the N = 20, 28 isotones within the dispersive optical model

The neutron single-particle characteristics of the $N = 20, 28$ isotones at $8 < Z < 30$ were calculated within the dispersive optical model. The global parameters of the spin-orbit and imaginary parts of the potential as well as surface absorption independent on neutron-proton asymmetry and increased diffuseness at large neutron excess were used in the calculations. The suitability of the global parameters to predict the evolution of the neutron single-particle structure of nuclei near the neutron drip line was investigated. The following results are in agreement with the available experimental data: the reduction of the particle-hole energy gaps, the degeneration of the $1f_{7/2}$ and $2p$ states and then a change in the $1f_{7/2}$, $2p_{3/2}$ level sequence and more rapid reduction of the $2p$-splitting in comparison with the $1f$-splitting with Z decreasing. The predictive power of the dispersive optical model with respect to neutron-rich nuclei is demonstrated

Proton dispersive optical potential of even-even Sn isotopes with 100 ≤ A ≤ 132

Section III. Theory of Atomic Nucleus and Fundamental Interaction

Proton dispersive optical potential of even-even Sn isotopes with 100 ≤ A ≤ 132

Section III. Theory of Atomic Nucleus and Fundamental Interaction

Evolution of single-particle structure of silicon isotopes

New data on proton and neutron single-particle energies $E_{nlj}$ of Si isotopes with neutron number N from 12 to 28 as well as occupation probabilities $N_{nlj}$ of single-particle states of stable isotopes 28, 30Si near the Fermi energy were obtained by the joint evaluation of the stripping and pick-up reaction data and excited state decay schemes of neighboring nuclei. The evaluated data indicate the following features of single-particle structure evolution: persistence of Z = 14 subshell closure with N increase, the new magicity of the number N = 16, and the conservation of the magic properties of the number N = 20 in Si isotopic chain. The features were described by the dispersive optical model. The calculation also predicts the weakening of N = 28 shell closure and demonstrates evolution of a bubble-like structure of the proton density distributions in neutron-rich Si isotopes

Features of the proton single-particle spectra of Ni, Zn, and Ge isotopes near the proton drip-line

Section III. Theory of Atomic Nucleus and Fundamental Interaction