Affordable Access

Publisher Website

Elastic scattering of 2–11 MeV protons by He4

Nuclear Physics
Publication Date
DOI: 10.1016/0029-5582(64)90233-0


Abstract Cross sections for the elastic scattering of protons by He 4 have been measured for proton energies in the range 2⪅ E p ⪅ 11 MeV (lab system), using a tandem Van de Graaff accelerator and a differentially-pumped gas scattering chamber. Excitation functions, measured at centre-of mass angles 30.9°, 90.0°, 109.7° and 164.4° from E p = 4 to 11 MeV in 100–200 keV steps, showed no fine structure. Angular distributions were measured at 1 MeV intervals from E p =2 to 10 MeV with 1% counting statistics and scattering phase shifts were obtained from these data. An angular distribution was measured with less accuracy at E p = 11 MeV. The S-wave phase shift varies with energy as if scattering took place from a hard sphere of radius about 2.5 fm, whereas the P-wave phase shifts are well described by the effects of the ground and first excited states in Li 5, calculated using single-level dispersion theory. Little can be concluded from the behaviour of the D-wave phase shifts. The spin polarization of the scattered protons has been calculated from the phase shifts and is in satisfactory agreement with experimental results from other laboratories.

There are no comments yet on this publication. Be the first to share your thoughts.