Elsevier

Nuclear Physics

Volume 50, January 1964, Pages 604-620
Nuclear Physics

Elastic scattering of 2–11 MeV protons by He4

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Abstract

Cross sections for the elastic scattering of protons by He4 have been measured for proton energies in the range 2⪅ Ep ⪅ 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 Ep = 4 to 11 MeV in 100–200 keV steps, showed no fine structure. Angular distributions were measured at 1 MeV intervals from Ep =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 Ep = 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 Li5, 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.

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Cited by (0)

†††

Work supported in part by the U. S. Atomic Energy Commission.

Now at Oak Ridge National Laboratory, Oak Ridge, Tennessee.

††

Now at the University of Kentucky, Lexington, Kentucky.

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