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EnglishDeep inelastic neutron-scattering measurements have been performed in dense fluid 4He along three isochores at number densities 33, 38, and 45 nm-3 and temperatures ranging from 4.35 to 56 K. Data have been analyzed in the plane-wave impulse-approximation framework to obtain the root-mean-square values of the single-particle momentum along a given direction px. The density and temperature behavior of the derived mean kinetic energies is discussed in comparison with a simple harmonic model for the fluid and with quantum simulations performed using a path-integral Monte Carlo code. The comparison with the harmonic models sheds light on the density dependence of the zero-point kinetic energy of the particles and points out the inadequacy of a single-frequency Einstein-oscillator model in describing its temperature dependence. The quantum simulation results are in substantial agreement with the experimental data although systematic deviations are found as the density is increased.
Albergamo, F., Nardone, M., & Filabozzi, A. (1997). Quantum effects in the single-particle kinetic energy of high-density fluid 4He. PHYSICAL REVIEW. B, CONDENSED MATTER, 56(22), 14614-14619.
| Tipologia: | Articolo su rivista |
| Citazione: | Albergamo, F., Nardone, M., & Filabozzi, A. (1997). Quantum effects in the single-particle kinetic energy of high-density fluid 4He. PHYSICAL REVIEW. B, CONDENSED MATTER, 56(22), 14614-14619. |
| IF: | Con Impact Factor ISI |
| Lingua: | English |
| Settore Scientifico Disciplinare: | Settore FIS/01 - Fisica Sperimentale |
| Revisione (peer review): | Sì, ma tipo non specificato |
| Tipo: | Articolo |
| Rilevanza: | Rilevanza internazionale |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevB.56.14614 |
| Stato di pubblicazione: | Pubblicato |
| Data di pubblicazione: | 1997 |
| Titolo: | Quantum effects in the single-particle kinetic energy of high-density fluid 4He |
| Autori: | |
| Autori: | Albergamo, F; Nardone, M; Filabozzi, A |
| Appare nelle tipologie: | 01 - Articolo su rivista |
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