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1− and 2+ discrete states in Zr90 populated via the (O17,O′17γ) reaction

Abstract : 2+ and 1− states in Zr90 were populated via the (O17,O′17γ) 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 (O17,O′17γ) data with 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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Submitted on : Tuesday, June 1, 2021 - 8:05:24 AM
Last modification on : Monday, December 13, 2021 - 9:15:43 AM


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F.C.L. Crespi, A. Bracco, R. Nicolini, E.G. Lanza, A. Vitturi, et al.. 1− and 2+ discrete states in Zr90 populated via the (O17,O′17γ) reaction. Physical Review C, American Physical Society, 2015, 91 (2), pp.024323. ⟨10.1103/PhysRevC.91.024323⟩. ⟨in2p3-01137715⟩



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