A Theoretical Investigation of Bound Roton Pairs in Superfluid Helium-4
Description:
The Bogoliubov theory of excitations in superfluid helium is used to study collective modes at zero temperature. A repulsive delta function shell potential is used in the quasiparticle excitation energy spectrum to fit the observed elementary excitation spectrum, except in the plateau region. The linearized equation of motion method is used to obtain the secular equation for a collective mode consisting of a linear combination of one and two free quasiparticles of zero total momentum. It is sho…
more
Date:
August 1974
Creator:
Cheng, Shih-ta
Partner:
UNT Libraries