0000000000205276

AUTHOR

Y. Kalmykov

showing 3 related works from this author

Complete Electric Dipole Response and the Neutron Skin inPb208

2011

A benchmark experiment on Pb-208 shows that polarized proton inelastic scattering at very forward angles including 0 degrees is a powerful tool for high-resolution studies of electric dipole (E1) and spin magnetic dipole (M1) modes in nuclei over a broad excitation energy range to test up-to-date nuclear models. The extracted E1 polarizability leads to a neutron skin thickness r(skin) = 0.156(-0.021)(+0.025) fm in Pb-208 derived within a mean-field model [Phys. Rev. C 81, 051303 (2010)], thereby constraining the symmetry energy and its density dependence relevant to the description of neutron stars.

PhysicsDipoleProtonPolarizabilityGeneral Physics and AstronomyNeutronInelastic scatteringElectric dipole transitionAtomic physicsMagnetic dipoleExcitationPhysical Review Letters
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Pygmy dipole resonance in208Pb

2012

Scattering of protons of several hundred MeV is a promising new spectroscopic tool for the study of electric dipole strength in nuclei. A case study of 208Pb shows that at very forward angles J^pi = 1- states are strongly populated via Coulomb excitation. A separation from nuclear excitation of other modes is achieved by a multipole decomposition analysis of the experimental cross sections based on theoretical angular distributions calculated within the quasiparticle-phonon model. The B(E1) transition strength distribution is extracted for excitation energies up to 9 MeV, i.e., in the region of the so-called pygmy dipole resonance (PDR). The Coulomb-nuclear interference shows sensitivity to…

PhysicsNuclear and High Energy PhysicsNuclear TheoryScatteringTransition dipole momentFOS: Physical sciencesCoulomb excitationResonance (particle physics)Nuclear Theory (nucl-th)DipoleNuclear Experiment (nucl-ex)Atomic physicsElectric dipole transitionNuclear ExperimentMultipole expansionNuclear ExperimentExcitationPhysical Review C
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Complete dipole response in [sup 208]Pb from high-resolution polarized proton scattering at 0°

2009

At the Research Center for Nuclear Physics, Osaka, Japan, the 208Pb(p,p´) reaction was measured at Ep=295 MeV and scattering angles Θlab= 0° - 10°. A high energy resolution of the order of ΔE/E ≈ 8x10^-5 was achieved, corresponding to ΔE=25-30 keV (FWHM). Cross sections were extracted by a multipole decomposition analysis of the angular distributions. Dominant contributions at very forward angles originate from E1 excitation due to Coulomb projectile-target interaction and spin M1 transitions caused by the spin-isospin part of the proton-nucleus interaction. A separation of these contributions was performed with two independent methods, viz. a multipole decomposition of the angular distribu…

PhysicsDipolePolarizabilityScatteringNeutronAtomic physicsFermi gasMultipole expansionSpin (physics)Resonance (particle physics)AIP Conference Proceedings
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