Inelastic Scattering of Cold Neutrons by Condensed Argon

Inelastic X-Ray Scattering as a Probe of the Transition Between the Hydrodynamic and the Single Particle Regimes in Simple Fluids

“…Unfortunately, the first results reported in the literature were mutually inconsistent. In fact, the persistence in the spectrum of side shoulders reminiscent of hydrodynamic modes was suggested by Chen et al [13] and successively confuted by Kroô et al [14]. The former INS work focused on several samples having a strongly coherent neutron-scattering cross-section, as Ne, Ar, and D 2 , and showed that, at low Qs, the frequency shift of side peaks approached from the above linear hydrodynamic law predicted by Eq.…”

The Spectrum of Density Fluctuations of Noble Gases Probed by THz Neutron and X-ray Spectroscopy

“…This urged the authors to interpret these peaks as the finite-Q extensions of the acoustic Brillouin peaks to mesoscopic scales. Conversely, Kroo et al [32] reported no direct evidence of inelastic structures, however they inferred the existence of phonon like excitations indirectly from a comparison between liquid and solid phase spectra. The discrepancy between the results of Chen and those of Kroo is a likely consequence of the different incident wavelength used in the two experiments (4.1 Å and 5.3 Å respectively), which made the two sets of data hardly comparable.…”

Nuclear Technology Branches Quarterly Report, January 1--March 31, 1967.

“…Over-the-peak counts for Pu, M p l X-rays gave only a questionable suggestion of a Pu peak for an Specimen [10][11][12][13][14][15][16][17][18][19][20][21][22][23] reveals that aluminum has penetrated uniformly to the interior of the U 0 2 particles, and no region of unreacted U02 remains ( Figure 1-27). This time, however, the temperature during irradiation was maintained I , , , the details of the preparation of the cermet, its enclosure in a capsule, and its subsequent heat treatment and metallographic examination.…”