The 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.

Isospin character of low-lying pygmy dipole states in Pb 208 via inelastic scattering of O 17 ions / F.C.L. Crespi, A. Bracco, R. Nicolini, D. Mengoni, L. Pellegri, E.G. Lanza, S. Leoni, A. Maj, M. Kmiecik, R. Avigo, G. Benzoni, N. Blasi, C. Boiano, S. Bottoni, S. Brambilla, F. Camera, S. Ceruti, A. Giaz, B. Million, A.I. Morales, V. Vandone, O. Wieland, P. Bednarczyk, M. Ciemała, J. Grebosz, M. Krzysiek, K. Mazurek, M. Zieblinski, D. Bazzacco, M. Bellato, B. Birkenbach, D. Bortolato, E. Calore, B. Cederwall, L. Charles, G. De Angelis, P. Désesquelles, J. Eberth, E. Farnea, A. Gadea, A. Görgen, A. Gottardo, R. Isocrate, J. Jolie, A. Jungclaus, N. Karkour, W. Korten, R. Menegazzo, C. Michelagnoli, P. Molini, D.R. Napoli, A. Pullia, F. Recchia, P. Reiter, D. Rosso, E. Sahin, M.D. Salsac, B. Siebeck, S. Siem, J. Simpson, P.-. Söderström, O. Stezowski, C. Theisen, C. Ur, J.J. Valiente-Dobón. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 113:1(2014), pp. 012501.-012501.1. [10.1103/PhysRevLett.113.012501]

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

F.C.L. Crespi
Primo
;
A. Bracco
Secondo
;
R. Nicolini;L. Pellegri;S. Leoni;R. Avigo;S. Bottoni;F. Camera;S. Ceruti;A.I. Morales;V. Vandone;A. Pullia;
2014

Abstract

The 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.
alpha-scattering; photon decay; gamma-rays; resonance; excitation; strenght; nuclei; energy; array
Settore FIS/04 - Fisica Nucleare e Subnucleare
Settore FIS/01 - Fisica Sperimentale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/250755
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