Quasifree subthreshold pion production in the reaction <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">C</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>12</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math>(p,d<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mo>)</mo></mrow><mrow><mn>11</mn></mrow></msup></mrow></math>B

A. A. Cowley; P. G. Roos; J. J. Lawrie; F. D. Smit; J. V. Pilcher; S. V. Förtsch; G. F. Steyn; G. C. Hillhouse

doi:10.1103/PhysRevC.45.1745

Quasifree subthreshold pion production in the reaction ${}^{12}C$ (p,d $π^{+}$ $)^{11}$ B

A. A. Cowley, P. G. Roos, J. J. Lawrie, F. D. Smit, J. V. Pilcher, S. V. Förtsch, G. F. Steyn, and G. C. Hillhouse

Phys. Rev. C 45, 1745 – Published 1 April 1992

Abstract

Nuclear pion production has been studied by means of the reaction ${}^{12}C$ (p,d $π^{+}$ $)^{11}$ B at an incident energy of 223 MeV, which is considerably below the threshold for a free N-N process. The shape and absolute cross section of the experimental energy-sharing distribution are in remarkable agreement with the prediction of a distorted-wave impulse approximation theory. This shows that the reaction mechanism is quasifree pion production, which is related to the elementary reaction p+p→ $π^{+}$ +d.