0000000001299770

AUTHOR

R. Kotte

showing 14 related works from this author

Deep sub-threshold $K^\ast (892)^{\circ}$ production in collisions of Ar + KCl at 1.76 A GeV

2013

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Out-of-plane emission of nuclear matter in Au+Au collisions between 100 and 800 AMeV

1997

We present new experimental results concerning the azimuthal distributions of proton-likes, light and intermediate mass fragments at midrapidity for Au(100-800 AMeV)+Au collisions measured with the FOPI phase-I detector at GSI in Darmstadt. The azimuthal distributions are investigated as a function of the collision centrality, the incident energy, the fragment charge and transverse momentum. The azimuthal anisotropy is maximum for impact parameters around 7 fm. Intermediate mass fragments present a stronger out-of-plane emission signal than light fragments and a saturation is reached for Z greater than or equal to 4. The azimuthal anisotropy increases with the fragment transverse momentum a…

PhysicsNuclear reactionNuclear and High Energy PhysicsPhase (waves)Charge (physics)Nuclear matterAzimuthNuclear physicsNuclear Reactions; Au-197 (Au-197; X); E=100-800 MeV/nucleon; Azimuthal anisotropy; Out-of-plane emissionAtomic physicsNuclear ExperimentAnisotropySaturation (magnetic)Beam (structure)Nuclear Physics A
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pp and ππ intensity interferometry in collisions of Ar+KCl at 1.76A GeV

2011

Results on pp, π+π+, and π-π- intensity interferometry are reported for collisions of Ar+KCl at 1.76$A$~GeV beam energy, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. The experimental correlation functions as a function of the relative momentum are compared to model calculations allowing the determination of the space-time extent of the corresponding emission sources. The π π source radii are found significantly larger than the pp emission radius. The present radii do well complement the source-size excitation functions of the collision system of size $A+A \simeq 40+40$. The pp source radius at fixed beam energy is found to increase linearly with the cube r…

Nuclear reactionPhysicsNuclear and High Energy Physics010308 nuclear & particles physicsHadronRadius[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesNuclear physicsMomentumPionPair productionCorrelation function0103 physical sciencesAtomic physics010306 general physicsNucleonNuclear Experiment
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Deep sub-threshold K*(892)0 production in collisions of Ar + KCl at 1.76A GeV

2013

Results on the deep sub-threshold production of the short-lived hadronic resonance K*(892)0 are reported for collisions of Ar + KCl at 1.76A GeV beam energy, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. The K*(892)0 production probability per central collision of \( P_{K^{*0}}=(4.4\pm 1.1 \pm 0.5)\times 10^{-4}\) and the K*(892)0/K0 ratio of \( P_{K^{*0}}/P_{K^0}=(1.9\pm 0.5\pm 0.3)\times 10^{-2}\) are determined at the lowest energy so far (i.e. deep below the threshold for the corresponding production in nucleon-nucleon collisions, \( \sqrt{s_{NN}}-\sqrt{s_{thr}}=-340\) MeV). The K*0/K0 ratio is compared with results of other experiments and with the pre…

PhysicsNuclear reactionNuclear and High Energy PhysicsMeson010308 nuclear & particles physicsBranching fractionHadron7. Clean energy01 natural sciencesHadronizationNuclear physics0103 physical sciencesProduction (computer science)Atomic physics010306 general physicsNuclear ExperimentEnergy (signal processing)Dimensionless quantity
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Cluster Formation during Expansion of Hot and Compressed Nuclear Matter Produced in Central Collisions of Au on Au at 250AMeV

1995

Complete distributions of the light and intermediate mass fragments ({ital Z}=1--6) produced within the polar angular range 1{sup {circ}}{le}{Theta}{sub lab}{le}30{sup {circ}} in highly central collisions of 250{ital A} MeV Au+Au are presented. The results of this measurement and a model analysis are used to study the expansion and clustering of the hot and compressed transient state formed in central collisions of such a heavy system. The influence of the initial conditions on the final observables is discussed.

PhysicsAngular rangeCluster (physics)General Physics and AstronomyPolarObservableAtomic physicsNuclear ExperimentNuclear matterPhysical Review Letters
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Sideward flow in Au + Au collisions at 400 A.MeV

1995

Abstract We present new experimental data obtained with the FOPI detector at SIS, for the Au + Au heavy-ion collisions at 400 A MeV incident energy. The sideward flow, determined from a method without reaction-plane reconstruction, and the nuclear stopping are studied as a function of the centrality of the collisions. In order to study the nuclear in-medium effects, which act on the NN cross sections and potential and hence on experimental observables like the nuclear-matter flow and stopping, these results are compared with the predictions of two different QMD versions. The first one offers a fully microscopic calculation of the cross sections and potential in the G-matrix formalism and na…

Nuclear reactionPhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsNuclear TheoryDetectorObservable01 natural sciences7. Clean energyNuclear physicsFormalism (philosophy of mathematics)0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Incident energyNuclear Experiment010306 general physics
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A highly-segmented ΔE-time-of-flight wall as forward detector of the 4π-system for charged particles at the SIS/ESR accelerator

1993

Abstract At the SIS/ESR accelerator facility at GSI in Darmstadt the 4π-detector system FOPI is under construction at present. It is designed for the investigation of central collisions of heavy ions in the energy range up to 2 A GeV. As phase I of this detector a forward wall has been built and used in various experiments. It comprizes a total number of 764 scintillators with an additional shell of 188 thin ΔE -detectors in front of it and covers the full azimuth of the polar angles from 1° to 30°. The velocity and the nuclear charge of the fragments are determined by a combined time-of-flight and ΔE measurement.

PhysicsNuclear and High Energy PhysicsRange (particle radiation)Wire chamberPhysics::Instrumentation and DetectorsNuclear TheoryDetectorScintillatorParticle detectorCharged particleNuclear physicsTime of flightIonization chamberAtomic physicsNuclear ExperimentInstrumentationNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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Evidence for collective expansion in light-particle emission following Au+Au collisions at 100, 150 and 250 A·MeV

1995

Abstract Light-particle emission from Au+Au collisions has been studied in the bombarding-energy range 100–250 A ·MeV, using ΔE − E R telescopes in coincidence with the FOPI detector in its phase I configuration. Center-of-mass energy spectra have been measured for Z = 1,2 isotopes emitted in central collisions at CM polar angles between 60° and 90°. Evidence for a collective expansion is reported, on the basis of the mean kinetic energies of hydrogen isotopes. Comparison is presented with statistical calculations (WIX code). For CM kinetic energy spectra, fair agreement is found between data and a recently developed transport model.

Nuclear reactionPhysicsNuclear and High Energy PhysicsRange (particle radiation)IsotopeHydrogenPhase (waves)chemistry.chemical_elementKinetic energySpectral lineCoincidenceNuclear physicschemistryAtomic physicsNuclear ExperimentNuclear Physics A
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"Table 5" of "Evidence for collective expansion in light-particle emission following Au+Au collisions at 100, 150 and 250 A��MeV"

2015

No description provided.

InclusiveAU AU --> HE XNUCLEUS NUCLEUS --> P XAU AU --> P XAU AU --> HE3 XAU AU --> TRITIUM XNUCLEUS NUCLEUS --> DEUT XNUCLEUS NUCLEUS --> TRITIUM XAU AU --> DEUT XNUCLEUS NUCLEUS --> HE3 XNUCLEUS NUCLEUS --> HE XMULT
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"Table 1" of "Evidence for collective expansion in light-particle emission following Au+Au collisions at 100, 150 and 250 A��MeV"

2015

No description provided.

InclusiveAU AU --> HE XNUCLEUS NUCLEUS --> P XAU AU --> P XAU AU --> HE3 XAU AU --> TRITIUM XEKINNUCLEUS NUCLEUS --> DEUT XNUCLEUS NUCLEUS --> TRITIUM XAU AU --> DEUT XNUCLEUS NUCLEUS --> HE3 XNUCLEUS NUCLEUS --> HE X
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"Table 2" of "Evidence for collective expansion in light-particle emission following Au+Au collisions at 100, 150 and 250 A��MeV"

2015

No description provided.

InclusiveAU AU --> HE XNUCLEUS NUCLEUS --> P XAU AU --> P XAU AU --> HE3 XAU AU --> TRITIUM XEKINNUCLEUS NUCLEUS --> DEUT XNUCLEUS NUCLEUS --> TRITIUM XAU AU --> DEUT XNUCLEUS NUCLEUS --> HE3 XNUCLEUS NUCLEUS --> HE X
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"Table 4" of "Evidence for collective expansion in light-particle emission following Au+Au collisions at 100, 150 and 250 A��MeV"

2015

No description provided.

InclusiveAU AU --> HE XNUCLEUS NUCLEUS --> P XAU AU --> P XAU AU --> HE3 XAU AU --> TRITIUM XNUCLEUS NUCLEUS --> DEUT XNUCLEUS NUCLEUS --> TRITIUM XAU AU --> DEUT XNUCLEUS NUCLEUS --> HE3 XNUCLEUS NUCLEUS --> HE XMULT
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"Table 6" of "Evidence for collective expansion in light-particle emission following Au+Au collisions at 100, 150 and 250 A��MeV"

2015

No description provided.

InclusiveAU AU --> HE XNUCLEUS NUCLEUS --> P XAU AU --> P XAU AU --> HE3 XAU AU --> TRITIUM XNUCLEUS NUCLEUS --> DEUT XNUCLEUS NUCLEUS --> TRITIUM XAU AU --> DEUT XNUCLEUS NUCLEUS --> HE3 XNUCLEUS NUCLEUS --> HE XMULT
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"Table 3" of "Evidence for collective expansion in light-particle emission following Au+Au collisions at 100, 150 and 250 A��MeV"

2015

No description provided.

InclusiveAU AU --> HE XNUCLEUS NUCLEUS --> P XAU AU --> P XAU AU --> HE3 XAU AU --> TRITIUM XEKINNUCLEUS NUCLEUS --> DEUT XNUCLEUS NUCLEUS --> TRITIUM XAU AU --> DEUT XNUCLEUS NUCLEUS --> HE3 XNUCLEUS NUCLEUS --> HE X
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