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Isospin character of low-lying pygmy dipole states in Pb 208 via inelastic scattering of O 17 ions

Autor Crespi, F. C. L.; Bracco, A.; Nicolini, R.; Mengoni, D.; Gadea, Andrés ; Görgen, A.; Gottardo, A.; Isocrate, R.; Jolie, J.; Jungclaus, Andrea ; Valiente-Dobón, J. J.
Fecha de publicación 2-jul-2014
EditorAmerican Physical Society
Citación Physical Review Letters 113: 012501 (2014)
ResumenThe properties of pygmy dipole states in Pb208 were investigated using the Pb208(O17, O17'γ) reaction at 340 MeV and measuring the γ decay with high resolution with the AGATA demonstrator array. Cross sections and angular distributions of the emitted γ rays and of the scattered particles were measured. The results are compared with (γ, γ′) and (p, p′) data. The data analysis with the distorted wave Born approximation approach gives a good description of the elastic scattering and of the inelastic excitation of the 2+ and 3- states. For the dipole transitions a form factor obtained by folding a microscopically calculated transition density was used for the first time. This has allowed us to extract the isoscalar component of the 1- excited states from 4 to 8 MeV. © 2014 American Physical Society.
Descripción F.C.L. Crespi et al. ; 5 pags. ; 4 figs. ; PACS numbers: 24.30.Cz, 24.10.Eq, 25.55.Ci, 27.80.+w
URI http://hdl.handle.net/10261/110318
Identificadoresdoi: 10.1103/PhysRevLett.113.012501
issn: 1079-7114
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