We report on measurement of momentum transfer to an atomic sodium beam by a standingwave laser field. Experiments were performed in two regimes: 1) the regime in which spontaneous emission is negligible; and 2) the regime in which the effects of spontaneous decay dominate the momentum transfer process. In the first regime, we observe diffraction of the atomic beam: the near-resonant Kapitza-Dir...

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We present the results of fitting elastic pp differential cross section data at 23.5 ≤ √ s ≤ 62.5 GeV with a novel analytic parametrization for the scattering amplitude. Making use of a fitting method, the errors from the free parameters are propagated to the imaginary part of the eikonal in the momentum transfer space. A novel systematic study of the effects coming from data at large momentum ...

Massive binary black holes (BBHs) are inevitably formed in the merged galactic nuclei before the black holes finally merge by emitting the gravitational radiation. However, it is still unknown how a massive BBH evolves after its semi-major axis reached to the sub-parsec/parsec scale where the dynamical friction with the neighboring stars is ineffective (the so-called the final parsec problem). ...

We present numerical simulations of dynamically unstable mass transfer in a double white dwarf binary with initial mass ratio, q = 0.4. The binary components are approximated as polytropes of index n = 3/2 and the initially synchronously rotating, semi-detached equilibrium binary is evolved hydrodynamically with the gravitational potential being computed through the solution of Poisson’s equati...

Phonons with wave vector q/(planck constant) were optically imprinted into a Bose-Einstein condensate. Their momentum distribution was analyzed using Bragg spectroscopy with a high momentum transfer. The wave function of the phonons was shown to be a superposition of +q and -q free particle momentum states, in agreement with the Bogoliubov quasiparticle picture.

The pion form factor calculation in the " point-form " of relativistic quantum mechanics is reconsidered. Particular attention is given to the relation between the momentum of the system and the momentum transfer as well as to the quark current.

Color transparency is the vanishing of initial and final state interactions, predicted by QCD to occur in high momentum transfer quasielastic nuclear reactions. For specific reactions involving nucleons, the initial and final state interactions are expected to be dominated by exchanges of pions. We argue that these interactions are also suppressed in high momentum transfer nuclear quasielastic ...

A new method for the determination of the real part of the elastic scattering amplitude is examined for high energy proton-proton and proton-nuclei elastic scattering at small momentum transfer. This method allows us to decrease the number of model assumptions, to obtain the real part in a narrow region of momentum transfer and to test different models for hadron-nuclei scattering. ∗Unité de Re...

Motivated by the forthcoming data from the E950 experiment at BNL for small angle polarized proton-carbon scattering we revisit the problem of Coulomb phase. The usually used approximation of the momentum transfer squared (q 2) small compared to the inverse elastic slope is not justified within the kinematics of the E950 experiment. We go beyond this approximation and derive a new rather simple...