Elsevier

Nuclear Physics A

Volume 311, Issue 3, 4 December 1978, Pages 492-506
Nuclear Physics A

Isospin effects in nucleon inelastic scattering from single-closed-shell nuclei: (I). The N = 50 isotones

https://doi.org/10.1016/0375-9474(78)90526-2Get rights and content

Abstract

Accurate measurements of elastic- and inelastic-scattering differential cross sections are obtained over a wide angular range for 11 MeV neutrons incident on 88Sr, 90Zr and 92Mo. The absolute cross sections are accurate to better than 5%. The parameters of complex optical potentials were extracted from the elastic-scattering data and applied via the collective model to the description of the cross sections of the first 2+ state of each isotope. Deformation parameters βnn′ (and lengths) δ = βR) were obtained for the quadrupole excitations and compared with similar parameters obtained from (p, p′) data on the same nuclei. The results clearly indicate that βnn′ > βpp′ for the N = 50 isotones, in good agreement with the theoretical predictions of Madsen, Brown and Anderson. The values of βnn′ and βpp′ are used to extract the isoscalar and isovector deformation parameters β0 and β1.

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    Supported in part by the National Science Foundation.

    ††

    Present address: Lord Corporation, Erie, Pennsylvania 16512.

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