Isoscalar spin excitation in90Zrand208Pb

Abstract

Isoscalar spin-transfer excitations have been measured in ${}^{90}\mathrm{Zr}$ and ${}^{208}\mathrm{Pb}$ by inelastic scattering of vector and tensor polarized 400 MeV deuterons in an excitation energy range from 2.5 to 43 MeV and 2.3 to 23 MeV, respectively. For ${}^{90}\mathrm{Zr},$ spin excitations were found between 7.5 and 10.7 MeV and in a large structure in the continuum (18 to 28 MeV). For ${}^{208}\mathrm{Pb},$ spin excitations were found at 3.55 and 5.85 MeV, between 6.5 and 11 MeV, and spread over the continuum. Elastic scattering cross sections and vector and tensor analyzing powers were measured between 3.4 and $24\ifmmode^\circ\else\textdegree\fi{}$ for Zr and Pb, and optical potential parameters were derived. The experimental results are compared to DWIA/RPA calculations. The transition densities used are generated using the continuum random phase approximation.