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Isospin Character of Low-Lying Pygmy Dipole States in Pb-208 via Inelastic Scattering of O-17 Ions
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2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 1, 012501- p.Article in journal (Refereed) Published
Abstract [en]

The properties of pygmy dipole states in Pb-208 were investigated using the Pb-208(O-17, O-17'gamma) reaction at 340 MeV and measuring the gamma decay with high resolution with the AGATA demonstrator array. Cross sections and angular distributions of the emitted gamma rays and of the scattered particles were measured. The results are compared with (gamma, gamma') 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.

Place, publisher, year, edition, pages
2014. Vol. 113, no 1, 012501- p.
Keyword [en]
Born approximation, Dipole state, Dipole transition, Distorted wave Born approximation, Form factors, High resolution, Isoscalar components, Isospin, Transition density
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-148613DOI: 10.1103/PhysRevLett.113.012501ISI: 000338665200009Scopus ID: 2-s2.0-84903845035OAI: oai:DiVA.org:kth-148613DiVA: diva2:737016
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QC 20140811

Available from: 2014-08-11 Created: 2014-08-11 Last updated: 2017-12-05Bibliographically approved

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Cederwall, Bo

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