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| dc.creator | Fabrocini, A. | |
| dc.creator | Vichi, L. | |
| dc.creator | Mazzanti Castrillejo, Ferran | |
| dc.creator | Polls Martí, Artur | |
| dc.date | 2009-12-23T12:30:45Z | |
| dc.date | 2009-12-23T12:30:45Z | |
| dc.date | 1996 | |
| dc.date.accessioned | 2024-12-16T10:19:53Z | |
| dc.date.available | 2024-12-16T10:19:53Z | |
| dc.identifier | 0163-1829 | |
| dc.identifier | http://hdl.handle.net/2445/10459 | |
| dc.identifier | 128818 | |
| dc.identifier.uri | http://fima-docencia.ub.edu:8080/xmlui/handle/123456789/10057 | |
| dc.description | 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. | |
| dc.format | 11 p. | |
| dc.format | application/pdf | |
| dc.language | eng | |
| dc.publisher | The American Physical Society | |
| dc.relation | http://dx.doi.org/10.1103/PhysRevB.54.10035 | |
| dc.relation | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.54.10035 | |
| dc.relation | Physical Review B, 1996, vol. 54, núm. 14, p. 10035-10045 | |
| dc.relation | http://dx.doi.org/10.1103/PhysRevB.54.10035 | |
| dc.rights | (c) The American Physical Society, 1996 | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | |
| dc.subject | Heli líquid | |
| dc.subject | Termodinàmica | |
| dc.subject | Teoria quàntica | |
| dc.subject | Líquid helium | |
| dc.subject | Thermodynamics | |
| dc.subject | Quantum theory | |
| dc.title | A microscopic approach to the response of 3He-4He mixtures | |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion |
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