0000000001314928

AUTHOR

A. Magel

showing 9 related works from this author

Few-neutron removal from238U at relativistic energies

1995

As part of a comprehensive study of uranium fragmentation at relativistic energies at the GSI projectile fragment separator, FRS, inclusive neutron-removal cross sections have been measured for severalxn channels at projectile energies of 600 and 950A MeV using targets of Al, Cu and Pb. The variation of the experimental cross sections with target nuclear charge is used to disentangle nuclear and electromagnetic contributions. The electromagnetic cross sections agree surprisingly well with a simple harmonic oscillator calculation of giant dipole resonances based on measured photonuclear cross sections and do not require an extra enhancement of the two-phonon giant dipole excitation as conclu…

PhysicsNuclear and High Energy PhysicsProjectileNuclear Theorychemistry.chemical_elementSimple harmonic motionUraniumEffective nuclear chargeNuclear physicsDipoleFragmentation (mass spectrometry)chemistryNuclear fusionNeutronAtomic physicsNuclear ExperimentNuclear PhysicsZeitschrift für Physik A Hadrons and Nuclei
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First spatial isotopic separation of relativistic uranium projectile fragments

1994

Abstract Spatial isotopic separation of relativistic uranium projectile fragments has been achieved for the first time. The fragments were produced in peripheral nuclear collisions and spatially separated in-flight with the fragment separator FRS at GSI. A two-fold magnetic-rigidity analysis was applied exploiting the atomic energy loss in specially shaped matter placed in the dispersive central focal plane. Systematic investigations with relativistic projectiles ranging from oxygen up to uranium demonstrate that the FRS is a universal and powerful facility for the production and in-flight separation of monoisotopic, exotic secondary beams of all elements up to Z = 92. This achievement has …

Nuclear and High Energy PhysicsTheoryofComputation_COMPUTATIONBYABSTRACTDEVICES010308 nuclear & particles physicsChemistryProjectileNuclear TheoryTheoryofComputation_GENERALSeparator (oil production)chemistry.chemical_element[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]UraniumAccelerators and Storage RingsComputingMethodologies_ARTIFICIALINTELLIGENCE01 natural sciencesNuclear physicsComputingMethodologies_PATTERNRECOGNITIONCardinal point0103 physical sciencesMonoisotopic massAtomic physicsNuclear Experiment010306 general physicsInstrumentationNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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Invariant-mass spectroscopy of $^{10}$Li and $^{11}$Li

1997

Break-up of secondary Li-11 ion beams (280 MeV/nucleon) on C and Pb targets into Li-9 and neutrons is studied experimentally. Cross sections and neutron multiplicity distributions are obtained, characterizing different reaction mechanisms. Invariant-mass spectroscopy for Li-11 and Li-10 is performed. The E1 strength distribution, deduced from electromagnetic excitation of Li-11 up to an excitation energy of 4 MeV comprises similar to 8% of the Thomas-Reiche-Kuhn energy-weighted sumrule strength. Two low-lying resonance-like structures are observed for Li-10 at decay energies of 0.21(5) and 0.62(10) MeV, the former one carrying 26(10)% of the strength and likely to be associated with an s-wa…

PhysicsNuclear reactionNuclear and High Energy Physics010308 nuclear & particles physics[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex]Nuclear Theory[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesIon0103 physical sciencesInvariant massNeutronAtomic physicsMultiplicity (chemistry)Nuclear Experiment010306 general physicsNucleonSpectroscopyExcitationNuclear Physics
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Neutron momentum distributions from "core break-up" reactions of halo nuclei

1995

Neutron angular distributions from violent break-up reactions of Li-11 and Be-11 have been measured at 28 MeV/u and 280 MeV/u and at 41 MeV/u and 460 MeV/u, respectively. The derived neutron momentum distributions show a narrow component in transverse momentum that is within uncertainties independent of beam energy and target charge. This component is suggested to be simply related to the momentum distribution of the loosely bound halo neutron(s) in the projectiles.

PhysicsBreak-UpProjectileAstrophysics::High Energy Astrophysical PhenomenaNuclear TheoryGeneral Physics and AstronomyNuclear physicsTransverse momentumPhysics::Accelerator PhysicsNeutronHaloAtomic physicsNuclear ExperimentBeam energyNuclear Physics
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Study of the Unstable NucleusL10iin Stripping Reactions of the Radioactive ProjectilesB11eandL11i

1995

Reactions of the halo systems Be-11 and Li-11 (at 460 and 280 MeV/nucleon) with a carbon target demonstrate that (n + Li-9) has an (unbound) l = 0 ground state very close to the threshold. The neutron halo of Li-11 has appreciable (1s(1/2))(2) and (0p(1/2))(2) components.

PhysicsStripping (chemistry)ProjectileAnalytical chemistryGeneral Physics and Astronomychemistry.chemical_elementmedicine.anatomical_structurechemistrymedicineNeutronHaloAtomic physicsNucleonGround stateNucleusCarbonPhysical Review Letters
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Longitudinal and transverse momentum distributions of 9Li fragments from break-up of 11Li

1995

7 pages, 3 figures, 1 table.

PhysicsNuclear and High Energy PhysicsTransverse planeFull width at half maximumMomentum (technical analysis)Break-UpSignificant differenceTransverse momentumSigmaHaloAtomic physicsNuclear Physics
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Dissociation of 8He into 6He + n + X at 240 MeV/u

1995

4 pages, 3 figures, 2 tables.

PhysicsNuclear and High Energy PhysicsPhysical chemistryDissociation (chemistry)
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"Table 2" of "Few neutron removal from U-238 at relativistic energies"

1997

Uranium fragmentation.

inorganic chemicalsU238 CU --> U236 XU238 PB --> U235 XU238 CU --> U235 XU238 PB --> U236 XU238 CU --> U234 XU238 PB --> U234 XIntegrated Cross Sectiontechnology industry and agricultureCross SectionU238 AL --> U236 XSIGcomplex mixturesU238 AL --> U237 XU238 PB --> U237 XU238 CU --> U237 XNUCLEUS NUCLEUS --> U234 XInclusiveU238 AL --> U234 XU238 AL --> U235 XNUCLEUS NUCLEUS --> U237 XNUCLEUS NUCLEUS --> U236 XNUCLEUS NUCLEUS --> U235 X
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"Table 1" of "Few neutron removal from U-238 at relativistic energies"

1997

Uranium fragmentation.

inorganic chemicalsU238 CU --> U236 XU238 CU --> U235 XU238 CU --> U234 XCross Sectioncomplex mixturesU238 CU --> U237 XNUCLEUS NUCLEUS --> U234 XInclusiveNUCLEUS NUCLEUS --> U233 XNUCLEUS NUCLEUS --> U237 XNUCLEUS NUCLEUS --> U236 XNUCLEUS NUCLEUS --> U235 XU238 PB --> U235 XU238 PB --> U236 XU238 PB --> U233 XU238 PB --> U234 XIntegrated Cross Sectiontechnology industry and agricultureU238 AL --> U236 XSIGU238 AL --> U237 XU238 PB --> U237 XU238 AL --> U233 XU238 AL --> U234 XU238 AL --> U235 X
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