A new twist to the long-standing three-nucleon analyzing power puzzle
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. © 2002 Elsevier Science B.V. All rights reserved.
Neidel, EM; Tornow, W; González Trotter, DE; Howell, CR; Crowell, AS; Macri, RA; Walter, RL; Weisel, GJ; Esterline, J; Witała, H; Crowe, BJ; Pedroni, RS; Markoff, DM
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