Abstract
The zero-temperature dispersion curve in liquid He4 is calculated assuming anomalous dispersion, ω(k)=c k(1+γ2k2), in zeroth order and including three-phonon interactions within the continuum model. It is shown that the damped-phonon mode changes to a collective-type excitation at higher momenta. Estimates of γ at saturated vapor pressure and 10 atm are obtained from experimental data on the onset of the long-lived excitation in liquid He4.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1591-1597 |
| Number of pages | 7 |
| Journal | Physical Review A |
| Volume | 10 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1974 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics