Study of electron-nucleus scattering and nuclear electromagnetic properties based on microscopic IBM (I) theoretical approach based on BE method

Nuclear transition charge/current density operators are composed according to valence nucleon degrees of freedom. By using boson expansion technique, a microscopic theoretical method (BE method) about the transformation of th e fermion density operators into bosom density operators is established. Th us, calculations of the nuclear charge/current densities can be carried out in the boson state space by taking advantage of the eigenfunctions of the microscopic IBM. Associated with the formal theories of electron-nucleus sc attering and nuclear electromagnetic transition, a microscopic approach, wh ich can be used to study nuclear transition charge/current densities, vario us form factors, differential cross sections, reduced transition rates, ele ctromagnetic multipole moments, g factors and so on, is built up. The preli minary results based on the microscopic sdIBM-2 has indicated that the phys ical quantities mentioned before can be described well in the framework of the microscopic approach. The preliminary calculations of spectrum, E2 tran sition boson structure functions (BSF) and transition charge density from 2 (1)(+) to 0(1)(+) in Os-192 are carried out in terms of the present approac h in the frame of the microscopic sd IBM-2. It is found that a reasonable d escription of these physical quantities has been achieved.