Chronology of Milestone Events in Particle Physics - ANDERSON 1952E
Chronology of Milestone Events in Particle Physics

ANDERSON 1952E

Anderson, H.L.; Fermi, E.; Long, E.A.; Nagle, D.E.;
Total Cross Sections of Positive Pions in Hydrogen
Phys. Rev. 85 (1952) 936;

Reprinted in
R. N. Cahn and G. Goldhaber, The Experimental Foundations of Particle Physics, Cambridge Univ. Press (1991) 121.
The Physical Review - the First Hundred Years, AIP Press (1995) 837.

Summary
In this letter and in the two preceding ones, the three processes:

(1)
scattering of positive pions,
(2)
scattering of negative pions with exchange of charge, and
(3)
scattering of negative pions without exchange of charge
have been investigated. It appears that over a rather wide range of energies, from about 80 to 150 M eV, the cross section for process (1) is the largest, for process (2) is intermediate, and for process (3) is the smallest. Furthermore, the cross sections of both positive and negative pions increase rather rapidly with the energy. Whether the cross sections level off at a high value or go through a maximum, as might be expected if there should be a resonance, is impossible to determine from our present experimental evidence. (Extracted from the introductory part of the paper.).

Accelerator CHIC-CYC Detectors CNTR

Related references
More (earlier) information appears in
E. Fermi et al., Phys. Rev. 85 (1952) 935;
H. L. Anderson et al., Phys. Rev. 85 (1952) 934;

Reactions
  π+ p X 56.-136. MeV (Tlab) cs

Particles studied
  Δ(1232 P33)++ ex

Record comments
Further evidence for the Δ(1232 P33)++ resonance.
    
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