Polarization inp-He4Elastic Scattering at 0.56, 0.80, 1.03, 1.27, and 1.73 GeV

The polarization in $p$-${}_{}{}^4{}_{}{}^{}\mathrm{He}$ elastic scattering has been measured between 0.56 and 1.73 GeV in a range of the square of the four-momentum transfer between 0.006 and 1.2 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. The data are characterized by positive polarization maxima at $-t$ near 0.08 and 0.36 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. At 0.56 GeV, a sharp peak of large negative polarization at 0.23 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ is observed. This structure persists at higher bombarding energies, but is no longer negative and becomes increasingly shallower as the bombarding energy increases to 1 GeV and then is relatively unchanging.