Energy dependence of the analyzing power for 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></math>(<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mrow><mover><mrow><mi>p</mi></mrow><mrow><mo>→</mo></mrow></mover></mrow></mrow></math>, <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>)<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>13</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> reaction with polarized protons of 200 to 250 MeV

G. J. Lolos; P. L. Walden; E. L. Mathie; G. Jones; E. G. Auld; W. R. Falk; R. B. Taylor

doi:10.1103/PhysRevC.25.1086

Rapid Communication

Energy dependence of the analyzing power for the ${}^{12}C$ ( $\vec{p}$ , $π^{+}$ ) ${}^{13}C$ reaction with polarized protons of 200 to 250 MeV

G. J. Lolos, P. L. Walden, E. L. Mathie, G. Jones, E. G. Auld, W. R. Falk, and R. B. Taylor

Phys. Rev. C 25, 1086(R) – Published 1 February 1982

Abstract

The analyzing power angular distributions $A_{y} (θ)$ for the ${}^{13}C_{g . s .}$ as well as for several ${}^{13}C$ * excited state transitions from the ${}^{12}C$ ( $\vec{p}$ , $π^{+}$ ) ${}^{13}C$ reaction are reported as a function of incident proton energy from 200 to 250 MeV. For the first time in reactions of the type $A (\vec{p}, π^{+}) A + 1$ , a dramatic energy dependence is observed for the analyzing power. A dependence of the shape of the analyzing power on the nature of the excited nuclear state is also observed. The cross section for the ${}^{13}C_{g . s .}$ transition shows indication of backward peaking not observed at energies below 225 MeV.

NUCLEAR REACTIONS ${}^{12}C$ ( $\vec{p}$ , $π^{+}$ ) ${}^{13}C_{g . s .}$ and several excited states, polarized protons, $T_{p} = 200 - 250$ MeV; measured $A_{y} (θ)$ , $\frac{d σ}{d Ω} (θ)$ .

Received 6 October 1981

DOI:https://doi.org/10.1103/PhysRevC.25.1086

Authors & Affiliations

G. J. Lolos, P. L. Walden, E. L. Mathie^*, G. Jones, and E. G. Auld

Physics Department, University of British Columbia and Tri-University Meson Facility, Vancouver, British Columbia, Canada V6T 2A6

W. R. Falk

Physics Department, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

R. B. Taylor

Physics Department, James Cook University of North Queensland, Townsville, North Queensland, Australia

^*Present address: Schweizerisches Institut für Nuklearforschung, CH-5234 Villigen, Switzerland.

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Vol. 25, Iss. 2 — February 1982

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Physical Review C

covering nuclear physics