Proton-³He elastic scattering at low energies

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B. M. Fisher, C. R. Brune, H. J. Karwowski, D. S. Leonard, and E. J. Ludwig
Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA

T. C. Black
Department of Physics and Physical Oceanography, University of North Carolina at Wilmington, Wilmington, North Carolina 28403, USA

M. Viviani, A. Kievsky, and S. Rosati
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa; and Department of Physics, University of Pisa, I-56100 Pisa, Italy

Received 21 December 2005; published 1 September 2006

Wepresent new accurate measurements of the differential cross section sigma ( theta )and the proton analyzing power A_y for proton-³He elastic scatteringat various energies. A supersonic gas-jet target has been employedto obtain these low-energy cross-section measurements. The sigma ( theta ) distributions havebeen measured at E_p=0.99, 1.59, 2.24, 3.11, and 4.02 MeV.Full angular distributions of A_y have been measured at E_p=1.60,2.25, 3.13, and 4.05 MeV. This set of high-precision datais compared to four-body variational calculations employing realistic nucleon-nucleon (NN)and three-nucleon (3N) interactions. For the unpolarized cross section, theagreement between the theoretical calculation and data is good whena 3N potential is used. The comparison between the calculatedand measured proton analyzing powers reveals discrepancies of approximately 50%at the maximum of each distribution. This is analogous tothe existing "A_y puzzle" known for the past 20 yearsin nucleon-deuteron elastic scattering.

URL:	http://link.aps.org/doi/10.1103/PhysRevC.74.034001
DOI:	10.1103/PhysRevC.74.034001
PACS:	21.45.+v; 21.30.-x; 24.70.+s; 25.40.Cm 21.45.+v Nuclear few-body systems 21.30.-x Nuclear forces 24.70.+s Polarization phenomena in nuclear reactions 25.40.Cm Nuclear elastic proton scattering YEAR: 2006

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