The measurement of the electron mean kinetic energy by identifying the electron temperature and the excitation temperature obtained by optical emission spectroscopy is theoretically studied for two temperature argon plasmas at atmospheric pressure. Using a 32-level collisional radiative model in which both electron impact and argon-impact inelastic collisions are taken into account, it has been...

In a recent experiment with ultracold trapped Rb85 atoms, Makotyn et al. studied a quantum-degenerate Bose gas in the unitary limit where its scattering length is infinitely large. We show that the observed momentum distributions are compatible with a universal relation that expresses the high-momentum tail in terms of the two-body contact C2 and the three-body contact C3. We determine the cont...

Whereas atom-molecule collisions have been studied with complete quantum-state resolution, interactions between two state-selected molecules have proven much harder to probe. Here, we report the measurement of state-resolved inelastic scattering cross sections for collisions between two open-shell molecules that are both prepared in a single quantum state. Stark-decelerated hydroxyl (OH) radica...

We show that the baryon stopping observed in heavy ion collisions both at CERN-SPS and at RHIC can be derived from the one observed in protonproton collisions. No increase in the size of the baryon junction component is required between small size (pp) and large size (AA) systems. LPT Orsay 02-43 May 2002 Unité Mixte de Recherche UMR n◦ 8627 CNRS A huge baryon stopping has been observed in cent...

Nonexponential attenuation of hadrons in nuclei and renormalization of data for hard QCD probes. For classical particles the propagation through a medium is exponentially attenuated with the path length L, i.e. the survival probability in a nucleus decreases as exp(−σhN in ρL), where σ in is the cross section of inelastic hadron-nucleon collisions, and ρ is the nuclear density. This kind of att...

The paper reviews the applicability of Debye-Waller factors and of Lamb factors to the non-resonant and resonant elastic scattering of X-rays, gamma-rays and thermal neutrons, emphasizing temporal aspects in the interactions. The influence of static disorder upon elastic scattering, in particular upon resonance scattering, is likewise treated. The scattering of X-rays, y-rays and thermal neutro...

This paper presents results for the behavior of particle-laden gases in a small Reynolds number vertical channel down flow. Results will be presented for the effects of particle feedback on the gas-phase turbulence and for the concentration profile of the particles. The effects of density ratio, mass loading, and particle inertia will be discussed. The results were obtained from a numerical sim...

Direct-photon measurements in p+p and Au+Au collisions at √ s NN = 200 GeV from the PHENIX experiment are presented. The p+p results are found to be in good agreement with next-to-leading-order (NLO) pertur-bative QCD calculations. Direct-photon yields in Au+Au collisions scale with the number of inelastic nucleon-nucleon collisions and don't exhibit the strong suppression observed for charged ...