# name
A microscopic approach to the response of 3He-4He mixtures

# metadata.dc.description.abstract[].value
Correlated-basis-function perturbation theory is used to evaluate the zero-temperature response S(q,ω) of 
3
−
4
He mixtures for inelastic neutron scattering, at momentum transfers q ranging from 1.1 to 1.8 A
˚
−
1
. We adopt a Jastrow correlated ground state and a basis of correlated particle-hole and phonon states. We insert correlated one-particle–one-hole and one- and two-phonon states to compute the second-order response. The decay of the one-phonon states into two-phonon states is accounted for in the boson-boson approximation. The full response is split into three partial components 
S
α
β
(q,ω), each of them showing a particle-hole bump and a one phonon, δ-shaped peak, which stays separated from the multiphonon background. The cross term 
S
34
(q,ω) results to be of comparable importance to 
S
33
(q,ω) in the particle-hole sector and to 
S
44
(q,ω) in the phonon one. Once the response has been convoluted with the experimental broadening, the computed scattering function is in semiquantitative agreement with recent experimental measurements.

# metadata.dc.relation.isformatof[].value
Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.54.10035

# metadata.dc.source[].value
Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
A microscopic approach to the response of 3He-4He mixtures