OPUS 4 | Search

Search for Fragment Emission from Nuclear Shock Waves (1975)

A. M. Poskanzer R. G. Sextro A. M. Zebelman H.H. Gutbrod A. Sandoval Reinhard Stock

Energy spectra and angular distributions have been measured of 3He and 4He fragments emitted from Ag and U targets, bombarded with 2.7-GeV protons, and 1.05-GeV/nucleon alpha particles and 16O ions. All cross sections increase dramatically with projectile mass. No narrow peaks are found in the angular distributions or in the energy spectra.

Final-state interactions in the production of hydrogen and helium isotopes by relativistic heavy ions on uranium (1976)

H. H. Gutbrod A. Sandoval P. J. Johansen A. M. Poskanzer J. Gosset W. G. Meyer G. D. Westfall Reinhard Stock

Double-differential cross sections have been measured for high-energy p, d, t, 3He, and 4He particles emitted from uranium targets irradiated with 20Ne ions at energies of 250, 400, and 2100 MeV/nucleon and 4He ions at 400 MeV/nucleon. By using the shape and yield of the proton energy spectra, the shape and yield of the d, t, 3He, and 4He energy spectra can be deduced at all measured angles for all incident projectile energies by assuming that they are formed by a coalescence of cascade nucleons, using a model analogous to that of Butler and Pearson, and Schwarzschild and Zupancic-caron.

Nuclear fireball model for proton inclusive spectra from relativistic heavy-ion collisions (1976)

G. D. Westfall J. Gosset P. J. Johansen A. M. Poskanzer W.G Meyer H. H. Gutbrod A. Sandoval Reinhard Stock

A simple model is proposed for the emission of nucleons with velocities intermediate between those of the target and projectile. In this model, the nucleons which are mutually swept out from the target and projectile form a hot quasiequilibrated fireball which decays as an ideal gas. The overall features of the proton-inclusive spectra from 250- and 400-MeV/nucleon 20Ne ions and 400-MeV/nucleon 4He ions interacting with uranium are fitted without any adjustable parameters.

Central collisions of relativistic heavy ions (1977)

J. Gosset H. H. Gutbrod A. M. Poskanzer W. G Meyer A. Sandoval Reinhard Stock G. D. Westfall

The energy spectra of protons and light nuclei produced by the interaction of 4He and 20Ne projectiles with Al and U targets have been investigated at incident energies ranging from 0.25 to 2.1 GeV per nucleon. Single fragment inclusive spectra have been obtained at angles between 25° and 150°, in the energy range from 30 to 150 MeV/nucleon. The multiplicity of intermediate and high energy charged particles was determined in coincidence with the measured fragments. In a separate study, fragment spectra were obtained in the evaporation energy range from 12C and 20Ne bombardment of uranium. We observe structureless, exponentially decaying spectra throughout the range of studied fragment masses. There is evidence for two major classes of fragments; one with emission at intermediate temperature from a system moving slowly in the lab frame, and the other with high temperature emission from a system propagating at a velocity intermediate between target and projectile. The high energy proton spectra are fairly well reproduced by a nuclear fireball model based on simple geometrical, kinematical, and statistical assumptions. Light cluster emission is also discussed in the framework of statistical models. NUCLEAR REACTIONS U(20Ne,X), E=250 MeV/nucl.; U(20Ne,X), U(α,X) E=400 MeV/nucl.; U(20Ne,X), Al(20Ne,X), E=2.1 GeV/nucl.; measured σ(E,θ), X=p, d, t, 3He,4He. U(20Ne,X), U(α,X), E=400 MeV/nucl.; U(20Ne,X), E=2.1 GeV/nucl.; measured σ(E, θ), Li to O. U(20Ne,X), U(12C,X), E=2.1 GeV/nucl.; measured σ(E, 90°), 4He to B. Nuclear fireballs, coalescence, thermodynamics of light nuclei production.

Upper limit of D 0 production in central Pb-Pb collisions at 158 A GeV (2005)

Christopher Alt NA49 Collaboration

Results are presented from a search for the decays D0 -> K min pi plus and D0 bar -> K plus pi min in a sample of 3.8x10^6 central Pb-Pb events collected with a beam energy of 158A GeV by NA49 at the CERN SPS. No signal is observed. An upper limit on D0 production is derived and compared to predictions from several models.

Indications for the onset of deconfinement in Pb + Pb collisions at the CERN SPS from NA49 (2005)

Peter Seyboth NA49 Collaboration

Particle production in central Pb+Pb collisions was studied with the NA49 large acceptance spectrometer at the CERN SPS at beam energies of 20, 30, 40, 80, and 158 GeV per nucleon. A change of the energy dependence is observed around 30A GeV for the yields of pions and strange particles as well as for the shapes of the transverse mass spectra. At present only a reaction scenario with onset of deconfinement is able to reproduce the measurements.

Hadron spectra and QGP hadronization in Au + Au collisions at RHIC (2002)

Kyrill A. Bugaev Marek Gazdzicki Mark I. Gorenstein

The transverse mass spectra of Omega hyperons and phi mesons measured recently by STAR Collaboration in Au+Au collisions at sqrt(s_NN) = 130 GeV are described within a hydrodynamic model of the quark gluon plasma expansion and hadronization. The flow parameters at the plasma hadronization extracted by fitting these data are used to predict the transverse mass spectra of J/psi and psi' mesons.

Rationelle, inhaltsbezogene Bestellformen : Ansichtssendungen und Profildienste ; internationaler Überblick und praktische Erfahrungen (1987)

Margot Wiesner

Der Binnenmarkt - ein Etikettenschwindel? (1993)

Margot Wiesner

Die Bedeutung der Preisbindung für die Bibliotheken (1990)

Margot Wiesner

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