Author/Authors :
E.M Neidel، نويسنده , , W Tornow، نويسنده , , D.E Gonz?lez Trotter، نويسنده , , C.R. Howell، نويسنده , , A.S Crowell، نويسنده , , R.A Macri، نويسنده , , RL Walter، نويسنده , , G.J Weisel، نويسنده , , J Esterline، نويسنده , , H Wita?a، نويسنده , , B.J Crowe III، نويسنده , , R.S Pedroni، نويسنده , , D.M Markoff، نويسنده ,
Abstract :
New results for the neutron–deuteron analyzing power Ay(θ) at En=1.2 and 1.9 MeV and their comparison to proton–deuteron data reveal a sizeable and unexpected difference which increases with decreasing center-of-mass energy. This finding calls for the theoretical treatment of a subtle electromagnetic effect presently not incorporated in rigorous three-nucleon scattering calculations, before it is justified to invoke charge-dependent three-nucleon forces and/or other new physics.
