p-He4Elastic Scattering at 1.05 GeV

Abstract

The elastic differential cross section of 7.0-GeV/c ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ scattered from hydrogen (equivalent $T_p=1.05\mathrm{}$ GeV) has been measured over a range $0.17<~-t<~0.85$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. The experiment has very low background (≤2%), adequate $t$ resolution (≤5%), a good absolute normalization (15%), and a statistical accuracy in the interference region of about 3%. The data show a shallow first minimum and a shape very similar to the recent data from Centres d'Etudes Nucléaires de Saclay.