Momentum distribution in 3He-4He liquid mixtures
We present variational calculations of the one-body density matrices and momentum distributions for 3 H e − 4 He mixtures in the zero-temperature limit, in the framework of the correlated basis functions theory. The ground-state wave function contains two- and three-body correlations and the matrix...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1997 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/10460 |
| Acceso en línea: | https://hdl.handle.net/2445/10460 |
| Access Level: | acceso abierto |
| Palabra clave: | Termoquímica Heli líquid Superfluïdesa Thermochemistry Liquid helium Superfluidity |
| Sumario: | We present variational calculations of the one-body density matrices and momentum distributions for 3 H e − 4 He mixtures in the zero-temperature limit, in the framework of the correlated basis functions theory. The ground-state wave function contains two- and three-body correlations and the matrix elements are computed by (Fermi) hypernetted chain techniques. The dependence on the 3 He concentration ( x 3 ) of the 4 He condensate fraction ( n ( 4 ) 0 ) and of the 3 He pole strength ( Z F ) is studied along the P = 0 isobar. At low 3 He concentrations, the computed 4 He condensate fraction is not significantly affected by the 3 He statistics. Despite the low x 3 values, Z F is found to be quite smaller than that of the corresponding pure 3 He because of the strong 3 H e − 4 He correlations and of the overall, large total density ρ. A small increase of n ( 4 ) 0 along x 3 is found, which is mainly due to the decrease of ρ with respect to the pure- 4 He phase. |
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