10 research outputs found
High E jets and double scattering
The recently found excess of high E jets over current QCD predictions is
attributed to gluon radiation at double scattering process inside a nucleon.
The order of magnitude estimate of the cross section fits experimental findings
rather well. The specific features of the process are discussed. Various
similar hadronic effects related to the short radiation length are described.Comment: 6 pages, plain LaTe
Probing nuclear expansion dynamics with -spectra
We study the dynamics of charged pions in the nuclear medium via the ratio of
differential - and -spectra in a coupled-channel BUU (CBUU)
approach. The relative energy shift of the charged pions is found to correlate
with the pion freeze-out time in nucleus-nucleus collisions as well as with the
impact parameter of the heavy-ion reaction. Furthermore, the long-range Coulomb
force provides a 'clock' for the expansion of the hot nuclear system. Detailed
comparisons with experimental data for at 1 GeV/A and at
2.0 GeV/A are presented.Comment: 21 pages, latex, figures include
Application of the functional integration method to the theory of pion condensation in nuclear matter
A new paradigm for Particle Tracking Velocimetry, based on graph-theory and pulsed neural networks
The tensor force in heavy nuclei: High momentum collectivity of unnatural parity excitations
Linear Response Theory with finite-range interactions
This review focuses on the calculation of infinite nuclear matter response
functions using phenomenological finite-range interactions, equipped or not
with tensor terms. These include Gogny and Nakada families, which are commonly
used in the literature. Because of the finite-range, the main technical
difficulty stems from the exchange terms of the particle-hole interaction. We
first present results based on the so-called Landau and Landau-like
approximations of the particle-hole interaction. Then, we review two methods
which in principle provide numerically exact response functions. The first one
is based on a multipolar expansion of both the particle-hole interaction and
the particle-hole propagator and the second one consists in a continued
fraction expansion of the response function. The numerical precision can be
pushed to any degree of accuracy, but it is actually shown that two or three
terms suffice to get converged results. Finally, we apply the formalism to the
determination of possible finite-size instabilities induced by a finite-range
interaction