Evidence for sideward emission of Sc fragments in the interaction ofU238with 400 GeV protons

Thick-target recoil properties of Sc fragments produced in the interaction of ${}_{}{}^{238}{}_{}{}^{}\mathrm{U}$ with 400 GeV protons have been determined. The anisotropy parameter $\frac{b}{a}$ was obtained from measurements on targets oriented either parallel or perpendicular to the proton beam on the assumption that the angular distribution of the fragments in the moving system has the form $a+b{cos}^2\theta$. The weighted average value of $\frac{b}{a}$ for four Sc nuclides is -0.67 ± 0.12 indicating that the angular distribution must show strong sideways peaking.