S. D. Kurgalin

Microscopic SU(3) model of -particle states in 2s1d nuclei

The microscopic model of -particle states based on the Hamiltonian of broken SU(3) symmetry is developed. The basis of these states is built up. General properties of -particle states of and nuclei are reproduced well enough.

α-cluster and α-binucleon states of 1p-shell nuclei

States that exhibit the properties of an α-cluster or an α-binucleon condensate are studied in 1p-shell nuclei. The generalized Hamiltonian of the Elliott SU(3) model is used to classify these states and to calculate their spectra. The results of the calculations are found to be in good agreement with experimental data. States not observed so far in the cluster spectra of the 12C, 16O, 10Be, and 12Be nuclei are predicted.

Alpha-particle states in extended Elliott model

A model of α-particle and quasimolecular states of nuclei based on the microscopic Hamiltonian of broken SU(3) symmetry commutative with the antisymmetrizer is built. The model provides an explanation for all qualitative properties of the spectra and allows one to calculate the spectroscopic factors.

Internal bremsstrahlung of strongly interacting charged particles

A universal theoretical model intended for calculating internal-bremsstrahlung spectra is proposed. In this model, which can be applied to describing nuclear decays of various type (such as alpha decay, cluster decay, and proton emission), use is made of realistic nucleus–nucleus potentials. Theoretical internal-bremsstrahlung spectra were obtained for the alpha decay of the 214Po nucleus, as well as for the decay of the 222Ra nucleus via the emission of a 14C cluster and for the decay of the 113Cs nucleus via proton emission, and the properties of these spectra were studied. The contributions of various regions (internal, subbarrier, and external) to the internal-bremsstrahlung amplitude were analyzed in detail. It is shown that the contribution of the internal region to the amplitude for internal bremsstrahlung generated in nuclear decay via proton emission is quite large, but that this is not so for alpha decay and decay via cluster emission. Thus, a process in which strong interaction of nuclear particles affects the internal-bremsstrahlung spectrum if found.

Multicluster solutions of the Elliott SU(3) nucleonic Hamiltonian and alpha-cluster level density

Properties of the dense α-cluster spectra of even-even nuclei with masses falling in the range 30 – 40 are analyzed. The spectrum of 32S nucleus is chosen as an example. The generalized Hamiltonian of the Elliott SU(3) model is invoked for the interpretation of the data.

Microscopic Description Of The Alpha‐Clustering Phenomenon In (2s‐1d)‐Shell Nuclei

States that exhibit the properties of α‐cluster resonances are studied in (2s‐1d)‐shell nucleus 32S. The generalized Hamiltonian of the Elliott SU(3) model is used to classify these states and to calculate their spectra. The results of the analysis are found to be in a good agreement with the bulk of the experimental data.

Spectrum of multicluster states of 44Ti nucleus in the generalized Elliott SU(3) model

The multicluster levels of 44Ti nucleus have been investigated in the generalized Elliott model. It is shown that the Hamiltonian of this model reproduces fairly well the energy levels of the 44Ti nucleus spectrum with zero values of the spin S and isospin T, produced in the (6 Li, d) reaction at energies of 37 and 50 MeV. The high-spin levels of 44Ti are predicted.

Clustering in Exotic Nuclei Studies by Transfer Reactions

Various aspects of the application of shell model approaches to cluster transfer reactions involving exotic nuclei are discussed. A scheme to calculate Spectroscopic Amplitudes for transfer reactions is given. It is calculated for a tetraneutron in 8He as an example. The reduction of the t+t clustering in the 6He nucleus, suggested by an experiment where transfer reactions were studied in the 6He+p collision is confronted with the concept of a supermultiplet for A=6 nuclei.

Microscopic approach to cluster radioactivity

Microscopic version of cluster decay theory is developed. The central point of the theory is the formalism of spectroscopic factors of heavy clusters workable all over the range of known examples of cluster decay. The approach is reasonably adequate to the experimental data. Obtained results confirm the assumption that the mechanism of the process is similar to α‐decay one.