Search academic texts

Information × Registration Number 0305U003281, 0103U004196 , R & D reports Title Systems of many particles quantum theory popup.stage_title Взаємодія ядер 3Н, 3Не з ядрами і знаходження частот в анізотропних системах Head Berezhnoy Yu.A., Registration Date 04-03-2005 Organization Kharkov national university named after V.N. Karazin popup.description2 The object of investigation in research effort is the determination of wave functions of three-nucleon nuclei 3H, 3He, cross-sections of different processes of interaction of these nucleus with heavy nucleus, investigation of anisotropic and isotropic phonon systems of superfluid 4He and of relaxation processes in such systems. The purpose of work is the determination of sructure characteristics of three-nucleon nuclei 3H, 3He based on experimentally measured binding energies and mean-square radiuses of these nuclei and the determination of pressure and temperature dependences of three phonon processes rates in isotropic and anisotropic systems of superfluid helium. The problem of the bound state of three bodies in nuclear physics is very difficult, as nuclear forces between two nucleons, are not precisely determined yet, and the solution of the system of three operational integro-differential Faddeev's equations is possible only in some limit cases. Therefore for a problem of three bodies the certainrealistic models, which allow to obtain the analytical expressions for formfactors of these nuclei and integral and differential interaction cross-sections of considered nuclei with the other nuclei are usually applied. On the basis of such approach wave functions of nuclei 3H, 3He were obtained, formfactors and integral and differential cross-sections of different interaction processes of these nuclei with heavy nuclei were found. Starting from the kinetic equation for phonons, the expression for the rate of three phonon relaxation in isotropic and anisotropic phonon systems of superfluid helium is found at different pressures. The obtained expressions are valid in the whole range of energies where three-phonon processes are allowed. Product Description popup.authors popup.nrat_date 2020-04-02 Close