Proton-Proton Centralp-Wave Parameter from 6 to 10 MeV (lab)

We have measured the shape of the $p+p$ cross section at five energies from 6-10 MeV (lab) using solid targets. Our results resolve discrepancies in values of the shape-sensitive central $p$-wave parameter ${\Delta }_c$ obtained from the gas-target data of other groups. We agree particularly well with data which had suggested difficulties in reconciling both high- and low-energy data with one-boson-exchange models of the nucleon-nucleon interaction.