Study of liquid helium neutron scattering. New analysis of the data
N. M. Blagoveshchenskii, A. V. Puchkov, A. N. Skomorokhov
State Scientufic Centre RF - Physico-energeticheskiy Institute, 1 sq. Bondarenko, Obninsk 249020, Russia
I. V. Bogoyavlenskii, L. V. Karnatsevich
National Scientific Center " Physico-Tekhnical Insititute ", 1 Academicheskaya st., Kharkov 310108, Ukraine
( Submitted November 15, 1996 )
A new analysis of earlier neutron scattering data obtained is presented. The experiments were carried out using a time-of-flight spectrometer DIN-2PI in the pulsed fast reactor IBR-2. The data were analyzed using the sequential data processing including translation of the dynamic structure factor to the constant S(Q, omega )-presentation. To approximate the one-phonon part of S(Q, omega) Damped Harmonic Oscillator function was used taking into account the instrumental resolution. It is shown that the experimental S(Q,omega) are in good agreement with the fitting model, i.e. this have a simple one-component structure. The results presented exhibit a certain peculiarity of the temperature dependence of S(Q,omega) for 4He in the wave vector region 0.5-0.8 Angstrem -1. Various explanations of this peculiarity are discussed.