0000000000406748

AUTHOR

Graham F. Peaslee

showing 4 related works from this author

Onset of nuclear vaporization inAu197+197Au collisions

1993

Multifragmentation has been measured for [sup 197]Au+[sup 197]Au collisions at [ital E]/[ital A]=100, 250, and 400 MeV. The mean fragment multiplicity increases monotonically with the charged particle multiplicity at [ital E]/[ital A]=100 MeV, but decreases for central collisions with incident energy, consistent with the onset of nuclear vaporization. Molecular dynamics calculations follow some trends but underpredict the observed fragment multiplicities. Including the statistical decay of excited residues improves the agreement for peripheral collisions but worsens it for central collisions.

PhysicsNuclear physicsNuclear reactionComputer Science::Information RetrievalExcited stateVaporizationGeneral Physics and AstronomyIncident energyMultiplicity (mathematics)Nuclear ExperimentCharged particlePhysical Review Letters
researchProduct

Fragment Flow and the Multifragmentation Phase Space

1995

Fragment distributions have been measured for Au+Au collisions at [ital E]/[ital A]=100 and 1000 MeV. A high detection efficiency for fragments was obtained by combining the ALADIN spectrometer and the MSU-Miniball/WU-Miniwall array. At both energies the maximum multiplicity of intermediate mass fragments (IMF) normalized to the size of the decaying system is about one IMF per 30 nucleons but the element distributions show significant differences. Within a coalescence picture the suppression of heavy fragments in central collisions at [ital E]/[ital A]=100 MeV may be related to a reduction of the density in momentum space which is caused by the collective expansion.

Nuclear reactionCoalescence (physics)PhysicsSpectrometer[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex]Computer Science::Information RetrievalGeneral Physics and AstronomyPosition and momentum space[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]Space (mathematics)Nuclear physicsPhase spaceMultiplicity (chemistry)Atomic physicsNuclear ExperimentNucleonPhysical Review Letters
researchProduct

Structure of exotic 7He and 9He

2004

The heavy helium isotopes 7,9 He were studied via their isobaric analog states (IAS) in 7,9 Li. The IAS were populated via resonance reactions of protons with radioactive beams of 6,8 He. The isospin-conserving neutron decay of T=3/2 resonances in 7 Li and proton decay of T=5/2 resonances in 9 Li were measured. New spectroscopic information on these states were obtained, and compared with the properties of levels in 7,9 He.

Nuclear physicsPhysicsNuclear and High Energy PhysicsProton decayNuclear TheoryIsobaric processResonanceNeutronAtomic physicsNuclear ExperimentIsotopes of heliumNuclear Physics A
researchProduct

Isobaric analog states as a tool for spectroscopy of exotic nuclei

2005

Abstract Spectroscopy of neutron rich exotic isotopes via their isobaric analog states (IAS) in less exotic nuclei is discussed. Several different experimental techniques, which can be applied to search for IAS of exotic isotopes, are described. Successful application of these techniques to the studies of heavy helium isotopes 7 He and 9 He led to the observation of unknown IAS in 7 Li and 9 Li. Spectroscopic information for these states were obtained, and implication of these findings to the structure of 7,9 He is considered.

Elastic scatteringNuclear physicsNuclear reactionNuclear and High Energy PhysicsIsotopeChemistryIsobaric processNeutronAtomic physicsNuclear ExperimentSpectroscopyInstrumentationIsotopes of heliumNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
researchProduct