10,428 research outputs found
Pion Interferometry From A Relativistic Fluid With A First Order Phase Transition In CERN-SPS 158 GeV/A Pb+Pb Collisions
We investigate pion source sizes through the Yano-Koonin-Podgoretski\u{\i}
(YKP) parametrization for the Hanbury-Brown Twiss (HBT) effect in the CERN-SPS
158 GeV/A central collisions. We calculate two-particle correlation functions
numerically based on a (3+1)-dimensional relativistic hydrodynamics with a
first order phase transition and analyze the pair momentum dependence of the
HBT radii extracted from the YKP parametrization in detail. We find that even
in the case of a first order phase transition, expansion and the surface
dominant freeze-out make the source in the hydrodynamical model opaque
significantly. Consequently, the interpretation of the temporal radius
parameter as the time duration becomes unavailable for the hydrodynamical
model.Comment: 5 pages, LaTeX with six eps figures, Contribution to 'International
Workshop XXVIII on Gross Properties of Nuclei And Nuclear Excitations'.
Hirchegg, Austria, Jan 16-22, 200
Realistic calculations of correlations and final state interaction effects in the A(e,e'p)X process off complex nuclei
A linked cluster expansion for the calculation of ground state observables of
complex nuclei with realistic interactions has been used to calculate the
ground state energy, density and momentum distribution of 16O and 40Ca. Using
the same cluster expansion and the wave function and correlation parameters
obtained from the energy calculation, we have evaluated the semi inclusive
reaction A(e,e'p)X taking final state interaction (FSI) into account by a
Glauber type approach; the comparison between the distorted and undistorted
momentum distributions provides an estimate of the transparency of the nuclear
medium to the propagation of the hit proton. The effect of color transparency
is also included by considering the Finite Formation Time (FFT) that the hit
hadron needs to reach its asymptotic physical state.Comment: 8 pages, Latex, 8 figures, presented at the "2nd International
Conference on Nuclear and Particle Physics with CEBAF at JLab
Hadron Propagation in Medium: the Exclusive Process A(e,e'p)B in Few-Nucleon Systems
The mechanism of propagation of hadronic states in the medium is a key point
for understanding particle-nucleus and nucleus-nucleus scattering at high
energies. We have investigated the propagation of a baryon in the exclusive
process A(e,e'p)B in few-nucleon systems using realistic nuclear wave functions
and Glauber multiple scattering theory both in its original form and within a
generalized eikonal approximation. New results for the processes 3He(e,e'p)2H
and 4He(e,e'p)3H are compared with data recently obtained at the Thomas
Jefferson Laboratory (JLAB).Comment: 8 pages, 9 figures, Presented at the Fifth International Conference
on Perspectives in Hadronic Physics -Particle-Nucleus and Nucleus-Nucleus
Scattering at Relativistic Energies-, 22 - 26 May 2006, Trieste, Ital
Lepton Scattering off Few-Nucleon Systems at Medium and High Energies
The interpretation of recent Jlab experimental data on the exclusive process
A(e,e'p)B off few-nucleon systems are analyzed in terms of realistic nuclear
wave functions and Glauber multiple scattering theory, both in its original
form and within a generalized eikonal approximation. The relevance of the
exclusive process 4He(e,e'p)^3H for possible investigations of QCD effects is
illustrated.Comment: 6 pages, 3 figures. Plenary talk given by C. Ciofi degli Atti at the
XX European Conference "Few Body Problems in Physics", Pisa, Italy, September
2007. To appear in Few-Body System
A new realistic many-body approach for the description of high-energy scattering processes off complex nuclei
A linked cluster expansion for the calculation of ground state observables of
nuclei with realistic interactions has been developed. Using the V8' potential
the ground state energy, density and momentum distribution of complex nuclei
have been calculated and found to be in good agreement with the results
obtained within the Fermi Hyper Netted Chain, and Variational Monte Carlo
approaches. Using the same cluster expansion, with wave function and
correlations parameters fixed from the calculation of the ground-state
observables, various high energy scattering processes off complex nuclei have
been calculated taking final state interaction effects into account by means of
the Glauber multiple scattering series.Comment: 7 pages, 4 figures, presented by M. Alvioli at the "13th
International Conference on Recent Progress in Many-Body Theories", Buenos
Aires - Argentina, 5-9 December 200
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