Quasifree <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></math> production studied using the <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><mo>(</mo><mi>γ</mi><mo>,</mo><mi> </mi><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mi>n</mi><mo>)</mo><mrow><mmultiscripts><mrow><mi mathvariant="normal">B</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>11</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> reaction in the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>Δ</mi><mn></mn><mo>(</mo><mn>1232</mn><mo>)</mo><mn></mn></math> resonance region

J. A. MacKenzie; D. Branford; J. Ahrens; J. R. M. Annand; R. Beck; G. E. Cross; T. Davinson; P. Grabmayr; S. J. Hall; P. D. Harty; T. Hehl; D. G. Johnstone; J. D. Kellie; T. Lamparter; M. Liang; I. J. D. MacGregor; J. C. McGeorge; R. O. Owens; M. Sauer; R. Schneider; A. C. Shotter; K. Spaeth; P. J. Woods; T. Yau

doi:10.1103/PhysRevC.54.R6

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Quasifree $π^{+}$ production studied using the ${}^{12}C (γ, π^{+} n) {}^{11}B$ reaction in the $Δ (1232)$ resonance region

J. A. MacKenzie, D. Branford, J. Ahrens, J. R. M. Annand, R. Beck, G. E. Cross, T. Davinson, P. Grabmayr, S. J. Hall, P. D. Harty, T. Hehl, D. G. Johnstone, J. D. Kellie, T. Lamparter, M. Liang, I. J. D. MacGregor, J. C. McGeorge, R. O. Owens, M. Sauer, R. Schneider, A. C. Shotter, K. Spaeth, P. J. Woods, and T. Yau

Phys. Rev. C 54, R6(R) – Published 1 July 1996

Abstract

Results are presented from a coincidence study of the ${}^{12}C (γ, π^{+} n) {}^{11}B$ quasifree pion production reaction made in the $Δ$ -resonance region using tagged photons. Cross sections for reactions originating on $1 p$ -shell protons are found to be significantly larger than predicted by calculations based on quasifree pion production. It is suggested that more sophisticated calculations, perhaps including medium effects, may be required to reproduce the data.

Received 4 December 1995

DOI:https://doi.org/10.1103/PhysRevC.54.R6

Authors & Affiliations

J. A. MacKenzie¹, D. Branford¹, J. Ahrens⁴, J. R. M. Annand², R. Beck⁴, G. E. Cross², T. Davinson¹, P. Grabmayr³, S. J. Hall², P. D. Harty², T. Hehl³, D. G. Johnstone¹, J. D. Kellie², T. Lamparter³, M. Liang¹, I. J. D. MacGregor², J. C. McGeorge², R. O. Owens², M. Sauer³, R. Schneider³, A. C. Shotter¹, K. Spaeth³, P. J. Woods¹, and T. Yau²

¹Department of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3JZ, Scotland
²Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland
³Physikalische Institut, Universität Tübingen, D-72076, Tübingen, Germany
⁴Institut für Kernphysik, Johannes-Gutenberg Universität, D-55099, Mainz, Germany

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Vol. 54, Iss. 1 — July 1996

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