Precision pion-proton elastic differential cross sections at energies spanning the Δ resonance

M. M. Pavan; J. T. Brack; F. Duncan; A. Feltham; G. Jones; J. Lange; K. J. Raywood; M. E. Sevior; R. Adams; D. F. Ottewell; G. R. Smith; B. Wells; R. L. Helmer; E. L. Mathie; R. Tacik; R. A. Ristinen; I. I. Strakovsky; H-M. Staudenmaier

doi:10.1103/PhysRevC.64.064611

Precision pion-proton elastic differential cross sections at energies spanning the Δ resonance

M. M. Pavan, J. T. Brack, F. Duncan, A. Feltham, G. Jones, J. Lange, K. J. Raywood, M. E. Sevior, R. Adams, D. F. Ottewell, G. R. Smith, B. Wells, R. L. Helmer, E. L. Mathie, R. Tacik, R. A. Ristinen, I. I. Strakovsky, and H-M. Staudenmaier

Phys. Rev. C 64, 064611 – Published 20 November 2001

Abstract

A precision measurement of absolute $π^{\pm} p$ elastic differential cross sections at incident pion laboratory kinetic energies from $T_{π} = 141.15$ to 267.3 MeV is described. Data were obtained detecting the scattered pion and recoil proton in coincidence at 12 laboratory pion angles from $55 °$ to $155 °$ for $π^{+} p$ and six angles from $60 °$ to $155 °$ for $π^{-} p .$ Single arm measurements were also obtained for $π^{+} p$ energies up to 218.1 MeV, with the scattered $π^{+}$ detected at six angles from $20 °$ to $70 ° .$ A flat-walled, supercooled liquid hydrogen target and solid ${CH}_{2}$ targets were used. The data are characterized by small uncertainties, $\sim 1 - 2 %$ statistical and $\sim 1 - 1.5 %$ normalization. The reliability of the cross section results was ensured by carrying out the measurements under a variety of experimental conditions to identify and quantify the sources of instrumental uncertainty. Our lowest- and highest-energy data are consistent with overlapping results from TRIUMF and LAMPF. In general, the Virginia Polytechnic Institute SM95 partial-wave analysis (PWA) solution describes our data well, but the older Karlsruhe-Helsinki PWA solution KH80 does not.

Received 12 March 2001

DOI:https://doi.org/10.1103/PhysRevC.64.064611

Authors & Affiliations

M. M. Pavan^*,†, J. T. Brack^‡, F. Duncan^§, A. Feltham^∥, G. Jones, J. Lange^¶, K. J. Raywood^†, and M. E. Sevior^**

Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T-1Z1

R. Adams, D. F. Ottewell, G. R. Smith^††, B. Wells, and R. L. Helmer

TRIUMF, Vancouver, British Columbia, Canada V6T-2A3

E. L. Mathie and R. Tacik

University of Regina, Regina, Saskatchewan, Canada S4S-0A2

R. A. Ristinen

Department of Physics, University of Colorado, Boulder, Colorado 80309

I. I. Strakovsky^‡‡

Petersburg Nuclear Physics Institute, RU-188350 Gatchina, St. Petersburg, Russia

H-M. Staudenmaier

Institute for Theoretical Particle Physics, University of Karlsruhe, Karlsruhe D-76128, Germany

^*Corresponding author. Electronic address: marcello.pavan@triumf.ca
^†Present address: TRIUMF, Vancouver, British Columbia, Canada V6T 2A3.
^‡Present address: Department of Physics, University of Colorado, Boulder, Colorado 80309.
^§Present address: Department of Physics, Queen’s University, Kingston, Ontario, Canada K7L 3N6.
^∥Present address: Broadcom Canada Ltd. Richmond, British Columbia, Canada V6V 2Z8.
^¶Present address: Defense Research Establishment, Ottawa, Ontario, Canada K1A 0Z4.
^**Present address: School of Physics, University of Melbourne, Parkville, Victoria 3052, Australia.
^††Present address: Jefferson Lab, 12000 Jefferson Avenue, MS 12H Newport News, VA 23606.
^‡‡Present address: Center for Nuclear Studies and Department of Physics, The George Washington University, Washington, D.C. 20052.

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Vol. 64, Iss. 6 — December 2001

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