Proton-He3 elastic scattering at low energies
Abstract
We present new accurate measurements of the differential cross section σ(θ) and the proton analyzing power Ay for proton-He3 elastic scattering at various energies. A supersonic gas-jet target has been employed to obtain these low-energy cross-section measurements. The σ(θ) distributions have been measured at Ep=0.99, 1.59, 2.24, 3.11, and 4.02 MeV. Full angular distributions of Ay have been measured at Ep=1.60, 2.25, 3.13, and 4.05 MeV. This set of high-precision data is compared to four-body variational calculations employing realistic nucleon-nucleon (NN) and three-nucleon (3N) interactions. For the unpolarized cross section, the agreement between the theoretical calculation and data is good when a 3N potential is used. The comparison between the calculated and measured proton analyzing powers reveals discrepancies of approximately 50% at the maximum of each distribution. This is analogous to the existing “Ay puzzle” known for the past 20 years in nucleon-deuteron elastic scattering.
- Publication:
-
Physical Review C
- Pub Date:
- September 2006
- DOI:
- 10.1103/PhysRevC.74.034001
- arXiv:
- arXiv:nucl-ex/0608024
- Bibcode:
- 2006PhRvC..74c4001F
- Keywords:
-
- 21.45.+v;
- 21.30.-x;
- 24.70.+s;
- 25.40.Cm;
- Few-body systems;
- Nuclear forces;
- Polarization phenomena in reactions;
- Elastic proton scattering;
- Nuclear Experiment
- E-Print:
- 22 pages, 9 figures, to be published in Physical Review C, corrected reference 49