2+ and 1− states in 90Zr were populated via the (17O,17O_γ ) reaction at 340 MeV. The γ decay was measured with high resolution using the AGATA (advanced γ tracking array demonstrator array). Differential cross sections were obtained at few different angles for the scattered particle. The results of the elastic scattering and inelastic excitation of 2+, 3−, and 1− states are compared with distorted-wave Born approximation (DWBA) calculations, using both the standard collective form factor and a form factor obtained by folding microscopically calculated transition densities. This allowed to extract the isoscalar component of the 1− state at 6.424 MeV. The comparison of the present (17O,17O_γ ) datawith existing (γ,γ_) and(p,p_) data in the corresponding region of the γ continuum (6–11 MeV), characterized by a large E1 component, shows completely different behaviors of the cross section as a function of the nuclear excitation energy. The comparison of the data with DWBA calculations suggests a decrease of the isoscalar strength in the cross section with increasing excitation energy.
1− and 2+ discrete states in Zr90 populated via the (O17,O′17γ) reaction / F. Crespi, A. Bracco, R. Nicolini, E.G. Lanza, A. Vitturi, D. Mengoni, S. Leoni, G. Benzoni, N. Blasi, C. Boiano, S. Bottoni, S. Brambilla, F. Camera, A. Corsi, A. Giaz, B. Million, L. Pellegri, V. Vandone, O. Wieland, P. Bednarczyk, M. Ciemała, M. Kmiecik, M. Krzysiek, A. Maj, D. Bazzacco, M. Bellato, B. Birkenbach, D. Bortolato, E. Calore, B. Cederwall, G. de Angelis, P. D’Esesquelles, J. Eberth, E. Farnea, A. Gadea, A. Görgen, A. Gottardo, H. Hess, R. Isocrate, J. Jolie, A. Jungclaus, R.S. Kempley, M. Labiche, R. Menegazzo, C. Michelagnoli, P. Molini, D.R. Napoli, A. Pullia, B. Quintana, F. Recchia, P. Reiter, E. Sahin, S. Siem, P.A. Söderström, O. Stezowski, C. Theisen, C. Ur, J.J. Valiente Dobón. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 91:2(2015 Feb 24), pp. 024323.1-024323.9. [10.1103/PhysRevC.91.024323]
1− and 2+ discrete states in Zr90 populated via the (O17,O′17γ) reaction
F. CrespiPrimo
;A. Bracco
;R. Nicolini;S. Leoni;S. Bottoni;F. Camera;A. Giaz;L. Pellegri;A. Pullia;
2015
Abstract
2+ and 1− states in 90Zr were populated via the (17O,17O_γ ) reaction at 340 MeV. The γ decay was measured with high resolution using the AGATA (advanced γ tracking array demonstrator array). Differential cross sections were obtained at few different angles for the scattered particle. The results of the elastic scattering and inelastic excitation of 2+, 3−, and 1− states are compared with distorted-wave Born approximation (DWBA) calculations, using both the standard collective form factor and a form factor obtained by folding microscopically calculated transition densities. This allowed to extract the isoscalar component of the 1− state at 6.424 MeV. The comparison of the present (17O,17O_γ ) datawith existing (γ,γ_) and(p,p_) data in the corresponding region of the γ continuum (6–11 MeV), characterized by a large E1 component, shows completely different behaviors of the cross section as a function of the nuclear excitation energy. The comparison of the data with DWBA calculations suggests a decrease of the isoscalar strength in the cross section with increasing excitation energy.
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