Observation of the Charge Symmetry Breaking d + d -> 4He + pi0 Reaction Near Threshold

E. J. Stephenson , A. D. Bacher , C. E. Allgower , A. Gardestig , C. Lavelle , G. A. Miller , H. Nann , J. Olmsted

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P. V. Pancella M. A. Pickar J. Rapaport T. Rinckel A. Smith H. M. Spinka U. van Kolck

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keywords breakingchargeeventsgammanearobservationreactionsymmetry

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We report the first observation of the charge symmetry breaking d + d -> 4He + pi0 reaction near threshold at the Indiana University Cyclotron Facility. Kinematic reconstruction permitted the separation of 4He + pi0 events from double radiative capture 4He + gamma + gamma events. We measured total cross sections for neutron pion production of 12.7 +- 2.2 pb at 228.5 MeV and 15.1 +- 3.1 pb at 231.8 MeV. The uncertainty is dominated by statistical errors.

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Observation of the Charge Symmetry Breaking d + d -> 4He + pi0 Reaction Near Threshold

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