0000000000170804

AUTHOR

M. Begemann-blaich

showing 4 related works from this author

Nuclear Contact Times in Dissipative Heavy Ion Collsions Measured Via γ-Ray Spectroscopy

1987

Electron spectra have been measured for elastic and dissipative U + Au collisions at 8.6 MeV/u and analysed within a simple schematic model which describes γ-ray emission in the presence of a nuclear contact time and a total kinetic energy loss (TKEL). A nearly linear dependence of the mean nuclear contact time τ and TKEL was found, reaching τ = 1.1 * 10-21 s with a variance σ = ±0.4 * 10-21 s for a TKEL of (400 ± 50) MeV.

PhysicsSIMPLE (dark matter experiment)Contact timeDissipative systemHeavy ionSchematic modelAtomic physicsImpact parameterSpectroscopyKinetic energy
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Correlations of intermediate mass fragments from Fe+Ta, Au, and Th collisions.

1995

Charge, velocity, and angular correlations between intermediate mass fragments (IMF) are presented for 50 and 100 MeV/nucleon Fe bombardments of Ta, Au, and Th targets. Correlation functions generated as a function of the relative velocity and the opening angle between two IMF's are qualitatively independent of the projectile energy and target mass and show a suppression at small relative velocities and opening angles due to the Coulomb repulsion between the fragments. The correlations are consistent with IMF's emitted primarily from a highly excited target residue following a rapid preequilibrium cascade. The correlation data are compared to model calculations using the event generator men…

PhysicsNuclear reactionNuclear and High Energy PhysicsProjectileNuclear TheoryRelative velocityCharge (physics)Nuclear matterNuclear physicsExcited stateAtomic physicsNuclear ExperimentNucleonEvent generatorPhysical review. C, Nuclear physics
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Electromagnetic fission of $^{238}$U at 600 and 1000 MeV per nucleon

1995

Electromagnetic fission of238U projectiles at E/A =600 and 1000 MeV was studied with the ALADIN spectrometer at the heavy-ion synchrotron SIS. Seven different targets (Be, C, Al, Cu, In, Au and U) were used. By considering only those fission events where the two charges added up to 92, most of the nuclear interactions were excluded. The nuclear contributions to the measured fission cross sections were determined by extrapolating from beryllium to the heavier targets with the concept of factorization. The obtained cross sections for electromagnetic fission are well reproduced by extended Weizsacker-Williams calculations which include E1 and E2 excitations. The asymmetry of the fission fragme…

PhysicsNuclear and High Energy PhysicsCold fissionCluster decayFissionNuclear Theorychemistry.chemical_elementUraniumResonance (particle physics)Nuclear physicschemistryNuclear fusionAtomic physicsBerylliumNuclear ExperimentNucleonNuclear Physics
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"Table 1" of "Electromagnetic fission of U-238 at 600-MeV and 1000-MeV per nucleon"

1997

Electromagnetic fission.

Nuclear TheoryIntegrated Cross SectionU238 U --> 2FRAGB XU238 C --> 2FRAGB XU238 AU --> 2FRAGB XCross SectionPhysics::Classical PhysicsSIGU238 AL --> 2FRAGB XU238 IN --> 2FRAGB XInclusiveU238 CU --> 2FRAGB XPhysics::Atomic and Molecular ClustersNUCLEUS NUCLEUS --> 2FRAGB XNuclear Experiment
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