Search results for "direct reactions"

showing 3 items of 3 documents

Study of isomeric states in $^{198,200,202,206}$Pb and $^{206}$Hg populated in fragmentation reactions

2018

International audience; Isomeric states in isotopes in the vicinity of doubly-magic 208Pb were populatedfollowing reactions of a relativistic 208Pb primary beam impinging on a9Be fragmentation target. Secondary beams of 198,200,202,206Pb and 206Hg wereisotopically separated and implanted in a passive stopper positioned in thefocal plane of the GSI Fragment Separator. Delayed γ rays were detected withthe Advanced Gamma Tracking Array (AGATA). Decay schemes were reevaluatedand interpreted with shell-model calculations. The momentumdependentpopulation of isomeric states in the two-nucleon hole nuclei206Pb/206Hg was found to differ from the population of multi neutron-holeisomeric states in 198…

Nuclear and High Energy Physicsisomeric decaysAstrophysics::High Energy Astrophysical PhenomenaPopulationNuclear Theory[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesFragmentation (mass spectrometry)Subatomic Physics0103 physical sciencesGamma spectroscopyGamma-ray spectroscopy010306 general physicseducationNuclear ExperimentPhysicseducation.field_of_studyIsotope010308 nuclear & particles physicsNuclear shell modeldirect reactionsrelativistic projectile fragmentationelectromagnetic transitionsnuclear shell modelAGATAPreSPEC-AGATAAtomic physicsBeam (structure)
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Neutron halos in the excited states of B12

2018

The differential cross sections of the $^{11}\mathrm{B}(d,p)\phantom{\rule{0.16em}{0ex}}^{12}\mathrm{B}$ reaction leading to formation of the ${1}^{+}$ ground state and the 0.95-MeV ${2}^{+}$, 1.67-MeV ${2}^{\ensuremath{-}}$, 2.62-MeV ${1}^{\ensuremath{-}}$, 2.72-MeV ${0}^{+}$, and 3.39-MeV ${3}^{\ensuremath{-}}$ excited states of $^{12}\mathrm{B}$ are measured at ${E}_{d}$ = 21.5 MeV. The analysis of the data is carried out within the coupled-reaction-channels method for the direct neutron transfer and the Hauser-Feshbach formalism of the statistical compound-nucleus model. The spectroscopic factors, asymptotic normalization coefficients, and rms radii of the last neutron in all states stu…

Physicsta114electromagnetic moments010308 nuclear & particles physicsNuclear Theorynucleon distributiondirect reactions01 natural sciencescluster modelsExcited state0103 physical sciencesbooritransfer reactionsPhysics::Accelerator PhysicsNeutronspectroscopic factorsHaloAtomic physicsydinfysiikkaNuclear Experiment010306 general physicsGround statePhysical Review C
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Neutron halos in the excited states of 12B

2018

The differential cross sections of the 11B(d,p) 12B reaction leading to formation of the 1+ ground state and the 0.95-MeV 2+, 1.67-MeV 2−, 2.62-MeV 1−, 2.72-MeV 0+, and 3.39-MeV 3− excited states of 12B are measured at Ed = 21.5 MeV. The analysis of the data is carried out within the coupled-reaction-channels method for the direct neutron transfer and the Hauser-Feshbach formalism of the statistical compound-nucleus model. The spectroscopic factors, asymptotic normalization coefficients, and rms radii of the last neutron in all states studied are deduced. The existence of the neutron halos in the 1.67-MeV 2− and 2.62-MeV 1− states is found, consistent with the earlier published data. New in…

cluster modelselectromagnetic momentsNuclear Theorynucleon distributiontransfer reactionsbooriPhysics::Accelerator Physicsspectroscopic factorsdirect reactionsNuclear Experimentydinfysiikka
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