Energy spectra to the ground state and excited states of 46 Ti have been measured for the 45 Sc( 3 He, d) 46 Ti reaction at a bombarding energy of 29 MeV. Excited levels of 46 Ti were observed in a wide energy range from 2 to 16.5 MeV. Levels from 10.4 to 16.5 MeV are observed for the first time and populated with a high probability. The population of high-lying states with energies E x ≥ 10 MeV in 46 Ti and their structure can be explained as the lowest excited levels of the 42 Ca + 4 He alpha-cluster system corresponding to the superdeformed state of 46 Ti.

The charge exchange reaction (3He, t) is studied using target odd nuclei of 45Sc and 197Au at 29‑MeV 3He beam energy. The angular distributions of the emission of deuterons and tritium in the 45Sc(3He, t)45Ti and 197Au(3He, t)197Hg reactions are studied. Experiments have shown that the maximum values of the cross sections for tritium emission reactions are achieved at angles close to the grazing angle. This indicates that the charge exchange reactions are of peripheral nature. The angular differential cross sections for the triton emission upon the population of the ground and excited states in 45Ti nuclei are accurately measured for the 45Sc(3He, t) 45Ti reaction.

Experimental cross sections for formation of isotopes 44,46 Sc - in reaction ( 3 He + 45 Sc), 46 Sc - in reaction ( 6 He + 45 Sc), 65 Zn - in reaction ( 3 He + 64 Zn), 196,198 Au - in reactions ( 3,6 He + 197 Au) have been analyzed within the TDSE approach for the external neutrons of 3,6 He, 45 Sc and 197 Au nuclei. Fusion-evaporation was taken into account using the NRV evaporation code. Results of calculation demonstrate overall satisfactory agreement with the experimental data

Inclusive energy spectra have been measured for light charged particles emitted in the bombardment of Ta target by48Ca ions at 261 MeV and 471 MeV. The reaction products were analyzed and detected by means of a (∆E-E) telescope placed in the focal plane of a magnetic spectrometer located at forward angles with respect to the beam direction. In all the reactions studied light charged particles with an energy close to the respective calculated kinematic limit for a two-body exit channel are produced with relatively great probability. The results obtained make it possible to draw some conclusions about the reaction mechanism involving the emission of light charged particles.

The differential cross sections for alpha-particle emission at an angle of 0 $${}^{\circ}$$ in the reactions induced by a 6-MeV/nucleon $${}^{56}$$ Fe beams incident to $${}^{238}$$ U and $${}^{181}$$ Ta targets were measured versus the alpha-particle energy by means of a high-resolution magnetic analyzer (MAVR setup). The resulting spectra were found to contain fast alpha particles of energy corresponding to the two- and three-body exit reaction channels, including alpha particles of energy close to the two-body kinematical limit. The data obtained in this experiment were analyzed on the basis of the moving-source model. The emission of nonequilibrium alpha particles in the forward direction from the heavier target nucleus upon the complete or incomplete fusion of nuclei was revealed within the time-dependent quantum approach.

Results for fusion and breakup fusion reaction ( 6 Li+ 194 Pt) are presented and compared with other experimental data and model calculations. A strong isotopic effect is observed when comparing our data with results from ( 6 Li+ 198 Pt)

Angular distributions of protons, deuterons, tritons, and alpha particles emitted in the reaction 2H+9Be at Elab=19.5, 25, and 35 MeV were measured to study the structure of 9Be, especially to shed light on the internal clusters and possible cluster transfer of 5He. The experiments were performed at sufficiently high energies to ensure suppression of compound nucleus contribution. Thus, the direct reaction mechanism should be mainly responsible for the measured five-nucleon transfer cross section. The analysis suggests a significant contribution of simultaneous five-nucleon transfer in the reaction channel 9Be (d,4He) 7Li.

The results of an experiment carried out on the MAVR high-resolution magnetic spectrometer and devoted to studying neutron transfer in the $${}^{18}\textrm{O}+^{181}$$ Ta reaction at the projectile energy of 10 MeV per nucleon are presented. A theoretical analysis of the experimental cross sections is performed for the neutron transfer mechanism by means of a time-dependent approach based on solving the time-dependent Schrödinger equation. The dynamics of the neutron transfer process is described, and the probabilities for the population of unoccupied neutron levels in the $${}^{19}$$ O nucleus are determined.

Experimental data on production of radioactive residuals in11B +209 Bi reaction a above-barrier projectile energy of 145.6 MeV are presented. The measurements and identification of reaction products were made using the method of induced activity. The residual nuclei in 24 < A < 211 mass range are considered as products of different interaction channels, occurring through evaporation at complete, incomplete fusion and the fission. The fragments in (60-160) atomic mass units range are regarded to the fission products and are confirmed with data from experiments with analogous fissile nuclei. The residual nuclei near target mass number can be presented as result of the different processes including emission of nucleons and light nuclei. Theoretical predictions within the frameworks of PACE-4 code simulation, allowing the predictions of formation, evaporation and fission of compound nuclei, were used for analyzing the measurement results. A substantial contribution to production of residual nuclei of the incomplete fusion and of additional mechanisms, proceeding at different impact parameters, were revealed at analysis of the experimental data.

Theoretical description of the experimental data on the formation of various isotopes in reactions (3He+194Pt) and (3He+45Sc) requires taking into account neutron and proton transfer channels, as well as fusion-evaporation channels. To calculate the probabilities of nucleon transfer as well as transfer cross sections the time-dependent Schrodinger equation (TDSE) has been solved numerically. Fusion- evaporation was taken into account using the statistical model code of the NRV web knowledge base. Results of calculations are in agreement with experimental data.

Charge exchange reactions on light and heavy ion beams are of interest in the production of new isotopes, and for studying the properties of radioactive and stable atomic nuclei. A charge exchange reaction (3He, t) has advantages over other types of reactions, due to much easier identification of charged particles t. The cross sections of reactions on 3He reach hundreds of mbarn at an energy of the bombarding beam near the Coulomb barrier. These reactions result in excitation of the isobar analog and other single particle states in residual nuclei.

The history of the discovery of delayed nuclear fission is presented, and the retrospective of investigations into this phenomenon that were performed at various research centers worldwide is outlined. The results obtained by measuring basic delayed -fission features, including the fission probability, the total kinetic energy of fission fragments, and their mass distributions, are analyzed. Recommendations concerning further studies in various regions of nuclear map with the aim of search for atomic nuclei undergoing delayed fission are given. Lines of further research into features of delayed fission with the aim of solving current problems of fission physics are discussed

The results of experiments performed at a high-resolution magnetic spectrometer (MAVR) are presented. The differential production cross sections for oxygen isotopes in the $${}^{18}\textrm{O}+^{181}$$Ta reaction at the projectile energy of 10 MeV per nucleon were measured at the MAVR facility. The yield of reaction products is analyzed theoretically in the finite-range distorted-wave Born approximation (FR-DWBA method) by means of the FRESCO code. The theoretical differential cross sections are calculated for sequential neutron transfer. The contributions of the mechanisms of sequential neutron transfer and dineutron-cluster transfer to the production cross sections for the neutron-rich oxygen isotopes $${}^{20,22,24}$$O are studied.

Theoretical description of the experimental data on the formation of various isotopes in reactions ( 3 He+ 194 Pt) and ( 3 He+ 45 Sc) requires taking into account neutron and proton transfer channels, as well as fusion-evaporation channels. To calculate the probabilities of nucleon transfer as well as transfer cross sections the time-dependent Schrodinger equation (TDSE) has been solved numerically. Fusion- evaporation was taken into account using the statistical model code of the NRV web knowledge base. Results of calculations are in agreement with experimental data.

The influence of the mechanisms of nuclear reactions on the population of isomeric states Sc-44m (6(+)), Au-196m (12(-)), Au-198m (12(-)), Hg-195m (13/2(+)), Hg-197m (13/2(+)), Tl-198m (7(+)), Tl-196m (7(+)) obtained in reactions induced by beams of weakly bound and radioactive nuclei He-3, Li-6, He-6 are studied. In direct reactions involving cluster transfer, the isomeric ratio is lower than in reactions, where fusion with evaporation of nucleons occurs. In the case of charge exchange reactions with beams of weakly bound nuclei, the isomeric ratios change only slightly. If the reaction Q-value is positive, neutron transfer is observed with high probability in interactions of all weakly bound nuclei with both light and heavy stable target nuclei. Cross sections and their isomeric ratios differ for nucleon stripping and pickup channels owing to the difference in population of excited single-particle and collective states.

The dynamical approach based on numeric solution of the time-dependent Schrodinger equation is applied to description of transfer and rearrangement of nucleons in nucleus-nucleus collisions. The results of calculation of neutron transfer cross sections for reaction He-6 + Au-197 and total reaction cross sections for reactions He-6 + Si-28, Li-9 + Si-28 are in agreement with experimental data.