Observation of the Charge Symmetry Breaking d+d→⁴He+π⁰ Reaction Near Threshold

E. J. Stephenson¹, A. D. Bacher^1,2, C. E. Allgower¹, A. Gårdestig³, C. M. Lavelle¹, G. A. Miller⁴, H. Nann^1,2, J. Olmsted¹, P. V. Pancella⁵, M. A. Pickar⁶, J. Rapaport⁷, T. Rinckel¹, A. Smith⁸, H. M. Spinka⁹, and U. van Kolck^10,11
1Indiana University Cyclotron Facility, Bloomington, Indiana 47408, USA
²Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
³Indiana University Nuclear Theory Center, Bloomington, Indiana 47408, USA
⁴Department of Physics, University of Washington, Seattle, Washington 98195, USA
⁵Physics Department, Western Michigan University, Kalamazoo, Michigan 49008, USA
⁶Department of Physics and Astronomy, Minnesota State University at Mankato, Mankato, Minnesota 56001, USA
⁷Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
⁸Physics Department, Hillsdale College, Hillsdale, Michigan 49242, USA
⁹Argonne National Laboratory, Argonne, Illinois 60439, USA
¹⁰Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
¹¹RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA