A Caltech Library Service

Photoproduction of Positive Mesons from Hydrogen: Results

Bacher, R. F. and Keck, J. C. and Peterson, V. Z. and Teasdale, J. G. and Tollestrup, A. V. and Walker, R. L. and Worlock, R. M. (1953) Photoproduction of Positive Mesons from Hydrogen: Results. Physical Review, 90 (4). pp. 1090-1091. ISSN 0031-899X.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


The center-of-mass differential cross section for photoproduction of positive pions from hydrogen has been measured by the methods described in the two previous abstracts, in the angular range 40° to 150°, for photons from 220 to 475 Mev. (Photon energies refer to the Laboratory System.) Results obtained by the two methods are in essential agreement. At 90°, dσ/dω has a maximum of 2.7 X 10^(-29) cm^2/sterad near 280 Mev and falls by a factor 5 at 450 Mev. The maximum in the excitation curve is even more pronounced at larger angles, but less pronounced at smaller ones. At 40° (c.m.) the peak occurs near 350 Mev and at 450 Mev the cross section has decreased only to 0.7 the, peak value. Angular distributions in the center-of-mass system show a marked assymetry about 90°, which changes character from low energy to high. Below 325 Mev, there ii a backward maximum, whereas above 375 Mev, there is a forward maximum. The total cross section reaches a maximum near 290 Mev and decreases by about a factor 3 at 450 Mev. The results below 300 Mev agree with the data already reported from Berkeley and Cornell.

Item Type:Article
Additional Information:© 1953 The American Physical Society.
Issue or Number:4
Record Number:CaltechAUTHORS:20141105-101018408
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51287
Deposited By: George Porter
Deposited On:05 Nov 2014 18:44
Last Modified:03 Oct 2019 07:31

Repository Staff Only: item control page