Cross-section and Analyzing Power Measurements of Proton-^3He Elastic Scattering at Low Energies

Details Cross-section and Analyzing Power Measurements of Proton-^3He Elastic Scattering at Low Energies Cross-section and Analyzing Power Measurements of Proton-^3He Elastic Scattering at Low Energies

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apru13001f&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Calculations using realistic two- and three-nucleon interactions have advanced to the point where predictions of observables in the p-^3He system are now possible. These calculations show discrepancies (as large as 45%) in the proton analyzing power A_y, similar to the long-standing ``Ay Puzzle'' seen in the three-nucleon system. To investigate this effect further, angular distributions of the differential cross section σ(θ) and Ay at several energies below Ep = 5.0 MeV were measured at TUNL. The σ(θ) experiments were performed with a hydrogen gas-jet target while the Ay measurements were performed with a ^3He gas cell. Large discrepancies between theory and experiment are seen at the peak of the A_y(θ) distribution, while in the σ(θ) case the agreement is good at the minimum of the distribution, but poor at more backward angles. Comparisons of these new high-precision data to theoretical predictions with and without a three-nucleon force included will be discussed.

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