RESEARCH OF THE THERMONUCLEAR REACTIONS WITH THE FORMATION OF 7Be NUCLEUS IN THE CLUSTER APPROXIMATION

Research of thermonuclear reactions is a great interest to modern nuclear physics. In this connection, in this work, we investigated one of the main reactions of the pp-cycle within the framework of the cluster model. For calculations, we used one of the methods of the cluster model, namely, the algebraic version of the method of resonating groups in which the studied reaction of scattering of an alpha particle with 3He was disassembled and presented in the form of two interacting clusters. The modified Hasegawa-Nagata potential was also used, which describes the behavior of the nucleon-nucleon interaction. The aim of the research is to identify common patterns in coupled and resonant states. The main theoretical calculation of the studied resonance and coupled states was carried out using a special program "2cl_SpectrPhases.exe". The obtained theoretical results were compared with experimental data.

Carbon and oxygen abundances in dwarf stars of the Solar neighbourhood

Stars and planets form from the same material, thus some of their properties are expected to be inter-connected. In order to characterise exoplanets, we need to investigate the planet-hosting stars. Carbon and oxygen are quite abundant and play an important role in stellar interiors by generating energy in thermonuclear reactions. Abundances of C and O may influence water availability on exoplanets. The C/O ratio also controls an amount of carbides and silicates that can be formed. Thus, we are performing a uniform study of C/O ratios in bright stars ( V < mag) located towards the northern ecliptic pole which will be targeted by the TESS and JWST space missions. The first results for a sample of 140 stars analysed are presented.