0000000000919810

AUTHOR

L. Johannsen

showing 7 related works from this author

The decay of $^{31}$Ar

1990

10 pages, 1 table, 4 figures.

PhysicsNuclear and High Energy PhysicsMeasured β-delayed Ep pp coinProtonBranching fractionOn-line mass separationNuclear Theory31Ar deduced decay channelsCaO targetNuclear physicsRadioactivity 31Ar(β+) [from Ca(p 3pxn) reaction]Physics::Accelerator PhysicsSurface barrier Si detectorsNuclear Physics - ExperimentLimit (mathematics)Atomic physicsNuclear ExperimentGround state
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Emission of neutrons and the neutron halo of $^{11}$Li

1991

The matter distribution of the neutron drip-line nuclei has been a subject of intense interest since pioneering radioactive-beam experiments at Berkeley1). Unusually large interaction cross-sections measured at relativistic energies for 11Li,14Be and 17B nuclei were translated into effective matter radii. It was found that these were significantly larger than for other p-shell nuclei. In particular, the root-mean-square (rms) mass radius of 11Li was found to be 3.2fm, which was considerably larger than the 2.4fm radius of 9Li. At the same time, no signatures for significant deformation of 11Li were found in measurements of electric quadrupole moment by means of laser spectroscopy2).

Physics[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex]010308 nuclear & particles physicsNeutron emissionNuclear TheoryRadiusNeutron scattering[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]7. Clean energy01 natural sciencesNeutron temperatureNuclear physicsNeutron number0103 physical sciencesNeutron cross sectionr-processNeutronNuclear Experiment010306 general physicsComputingMilieux_MISCELLANEOUS
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Two-neutron removal reactions for very neutron-rich nuclei

1992

Abstract The two-neutron removal reactions of beams of 11 Li, 14 Be and 8 He upon Be, Ni and Au targets were studied at 30 MeV/u. The cross sections and the neutron forward angular distributions were measured; they correlate strongly with the two-neutron separation energy of the projectile. Even though the coverage of the neutron detectors was limited, a rough neutron-neutron distribution could be extracted. A simplified interpretation of the data is presented.

Nuclear reactionPhysicsNuclear and High Energy Physics010308 nuclear & particles physicsProjectileAstrophysics::High Energy Astrophysical PhenomenaNuclear Theory[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesNuclear physics0103 physical sciencesNeutron cross sectionNeutron detectionNeutronAtomic physicsNuclear Experiment010306 general 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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First observation of beta-delayed deuteron emission

1990

5 pages, 2 figures.

Nuclear physicsPhysicsNuclear and High Energy PhysicsDeuteriumBranching fractionNuclear Physics - ExperimentBeta (velocity)Atomic physicsIntensity (physics)
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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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