Double Analog Transition <span class="aps-inline-formula"><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>14</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mo>(</mo><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mo>,</mo><mi> </mi><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow><mo>)</mo><mrow><mmultiscripts><mrow><mi mathvariant="normal">O</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>14</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> at 50 MeV

M. J. Leitch; E. Piasetzky; H. W. Baer; J. D. Bowman; R. L. Burman; B. J. Dropesky; P. A. M. Gram; F. Irom; D. Roberts; G. A. Rebka, Jr; J. N. Knudson; J. R. Comfort; V. A. Pinnick; D. H. Wright; S. A. Wood

doi:10.1103/PhysRevLett.54.1482

Double Analog Transition ${}^{14}C (π^{+}, π^{-}) {}^{14}O$ at 50 MeV

M. J. Leitch, E. Piasetzky, H. W. Baer, J. D. Bowman, R. L. Burman, B. J. Dropesky, P. A. M. Gram, F. Irom, D. Roberts, G. A. Rebka, Jr., J. N. Knudson, J. R. Comfort, V. A. Pinnick, D. H. Wright, and S. A. Wood

Phys. Rev. Lett. 54, 1482 – Published 8 April 1985

Abstract

Differential cross sections for the double-isobaric-analog-state transition in the reaction ${}^{14}C (π^{+}, π^{-}) {}^{14}O$ were measured over the angular range 20° to 130°. The cross section extrapolated to 0° is 3.9±0.5 μb/sr and the angle-integrated cross section is 15.3±1.6 μb. These values are much larger than expected from the trends of data at higher energies and may indicate the presence of new phenomena. The results are compared to recent six-quark bag-model calculations which predict such trends.