Nuclear structure fundamental studies and nuclear physics practical applications (2009 - 2012)
The aims of this joint nuclear physics research project are: 1) to continue the fundamental experimental and theoretical nuclear structure studies in Latvia, which are carried out in collaboration with physicists from other countries since 1950-ties; 2) to continue and to develop further the studies of nuclear physics applications for material analysis and environmental protection; 3) to participate in the creation of the National Multifunctional Cyclotron Center by developing research program and plans for the use of channel provisioned for scientific studies; 4) to train a new generation of nuclear physics specialists, which would be necessary in Latvia with regard to the planned cyclotron facility construction, the development of nuclear energetics in the Baltic region, and in order to ensure the radiation safety requirements.
Project includes three directions of studies. In the direction of experimental nuclear structure studies, the development of nuclear level schemes of A~190 transitional deformation region nuclei 183W, 188Re, and 192Ir is planned, basing on the experimental single and coincidence spectra obtained from the (n,γ) reaction measurements, performed in the ILL (Grenoble) and NPL (Rež), as well as on (d,p) and (dpol,α) reaction measurement data obtained at the tandem of Munich Technical University. The theoretical nuclear physics studies provision: 1) the systematic study of residual NN-interaction potential properties in dependence from nuclear shape in the A~190 transitional deformation region; 2) detailed theoretical calculations of 188Re, and 192Ir low-lying level structure in the frameworks of two-quasiparticle plus rotor coupling model; 3) the application of extended strictly restricted dynamics model, which includes spin-orbital type interaction operator between internal and collective degrees of freedom, to the evaluation of p-shell nuclei, and the assessment of possibilities to improve description of binding and excited level energies of light nuclei isospin multiplets using model developed in the frameworks of restricted dynamics conception; 4) to continue quantum chaos criteria studies in the frameworks of triaxial rotator model, and complete version of IBM-1; 5) to continue nuclear shape phase transition studies in the interacting boson model, giving special attention to possible correlations between critical points and lines, and quantum chaos criteria in the case of A~190 region nuclei. In the direction of nuclear physics applications it is planned: 1) to develop new methods for the identification of radionuclides in different media; 2) to continue monitoring of the potentially polluted regions of Latvia, acquiring data about migration and accumulation of radionuclides in forest ecosystems, soils and waters for a longer period; 3) to carry out the analysis of drinking water samples in the different regions of Latvia, assessing the concentration of radionuclides; 4) to study possibilities to use A1N ceramics detectors in the ionizing radiation dosimetry.