A. Shor

Internal nuclear momentum and subthreshold anti-proton production in p-nucleus and nucleus-nucleus collisions

Abstract We investigate subthreshold anti-proton production in p-nucleus and nucleus-nucleus collisions in terms of the internal nuclear momentum of the nucleons in the colliding nuclei. We employ a first collision model which contains the kinematics of individual NN collisions, with the inclusion of internal nuclear momentum distributions extracted from data on quasi-elastic electron scattering and backward proton production. Calculations for subthreshold particle production in p-nucleus collisions show excellent agreement with experimental data on subthreshold anti-proton and K + production in p + Cu collisions. An extension of the model to nucleus-nucleus collisions includes also the internal momentum for the incoming projectile nucleons, and contains the parameters obtained from a best fit to the p + Cu → p + X data. Despite the excellent agreement with the p + Cu → p + X data, this model underestimates recent experimental data on subthreshold p production in nucleus-nucleus collisions by large factors. Implications for collective phenomena at large nuclear densities and temperatures are discussed.

Systematic study of low-mass electron pair production in p-Be and p-Au collisions at 450 GeV/c

Abstract. In a joint effort the CERES/NA45 and TAPS collaborations have measured low-mass electron pairs in p–Be and p–Au collisions at 450 GeV/n

The CERES RICH detector system

c

Time-resolved fast neutron imaging: simulation of detector performance

at the CERN SPS. In the range covered up to n

In-beam experience from the CERES UV-detectors: prohibitive spark breakdown in multi-step parallel-plate chambers as compared to wire chambers

approx

Search for direct photons from S-Au collisions at 200 GeV/nucleon

1.5 GeV/n

First results of the CERES electron pair spectrometer from p + Be, p + Au and S + Au collisions

c^2

Scaling patterns for particle production in relativistic nuclear collisions

the mass spectra from p–Be and p–Au collisions are well explained by electron pairs from decays of neutral mesons. For p–Au our result is new. For p–Be, the simultaneously measured electron pair inclusive pair spectrum in which instrumental uncertainties are highly reduced. We confirm the earlier finding of HELIOS-1 with significantly reduced systematic uncertainties of 23% in the mass range below 450 MeV/n

Production of J/ψ following quark-gluon plasma formation

c^2

Strangeness production in relativistic nuclear collisions

, and of 28% in the mass range above 750 MeV/n