6533b7d8fe1ef96bd126a2a6
RESEARCH PRODUCT
Pygmy dipole resonance in208Pb
Harutaka SakaguchiY. ShimbaraY. ShimbaraI. PoltoratskaV. Yu. PonomarevTakayoshi SuzukiJochen WambachJuzo ZenihiroTakeo KawabataR. NevelingA. M. KrumbholzCarlos A. BertulaniHisanori FujitaHisanori FujitaAchim RichterKichiji HatanakaMasanori DozonoB. Oezel-tashenovK. NakanishiHooi Jin OngP. Von Neumann-coselHiroaki MatsubaraYasuhiro SakemiT. AdachiKunihiro FujitaY. ShimizuElena LitvinovaB. RubioY. FujitaY. TameshigeJ. CarterYoshiko SasamotoY. KalmykovF. D. SmitAtsushi TamiiM. ItohM. YosoiH. Okamurasubject
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 ExperimentExcitationdescription
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 the underlying structure of the E1 transitions, which allows for the first time an experimental extraction of the electromagnetic transition strength and the energy centroid of the PDR.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-03-09 | Physical Review C |