Proton-3He elastic scattering at low energies and the “Ay Puzzle” M. Viviani, L. Girlanda, A. Kievsky, L.E. Marcucci and S. Rosati EPJ Web of Conferences, 3 (2010) 05011 Published online: 12 April 2010 DOI: 10.1051/epjconf/20100305011