Specialization: 011200 Physics 
Program: Neutron and synchrotron physics
Department of nuclear-physics research methods.
Scientific advisor: prof. Grigoriev S.V.
Reviewer: Moskvin E.V.

Description of the experimental data of the spin-echo small-angle 
neutron scattering on the basis of the neutron scattering cross-section 
analysis.
Iashina E.G.

Spin-echo small-angle neutron scattering (SESANS) is a novel method for determining the structure of materials in real space. The method is based on the Larmor precession of polarized neutrons transmitted through two successive precession devices before and after the sample, which encodes the scattering angle into a net precession angle. The principal difference of SESANS from conventional SANS is that it delivers a real-space correlation function in course of the measurements.
We obtain the theoretical expressions for measured SESANS function and the corresponding correlation function of the fractal objects. This functions were approximated by elementary functions for the interpretation of the experiment. The method of spin-echo small-angle scattering was used for study of the structural organization of chromatin in a nuclear of the biological cells. The SESANS function of the nuclear cell shows the exponential decay. In this case the spatial correlation function of the scattering object is logarithm. This fact corresponds to the transition from the surface to the volume fractal.