MEASUREMENT OF POLARIZATION IN pi- p ELASTIC SCATTERING FROM 229TO 3 90 MeV Page: 4 of 33
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The phenomenological analysis of low-to-mediu energy pion-
nucleon scattering has usually taken the form of phase-shift analyses.1
This type of analysis has had the difficulty that, except at the lowest
energies, it is not always possible to determine whether a unique solu-
A possible route out of this difficulty is to start with a well-
established solution at a low energy and to continue this solution up-
wards at small increments in energy. At each energy one would make
the requirement of any solution found that it not only fit the data
well, but also that it join continuously to the (presumably unique)
solutions found at .lower energies. We do not exclude that other
criteria such as those established by unitarity and causality consider-
ations (i.e., dispersion relations) be also imposed. In this manner
one may hope eventually to establish a phase-shift solution that is
unique at all energies for which sufficient data exist.
The object of this experiment was to increase the amount of data
available in order to try to pin down a unique solution at energies
near -300 Mev. At the same time we attempted to resolve certain
inconsistencies among previously existing experiments2'3 and analyses'.
In the experiment reported here the polarization parameter, P(o),
in elastic n p scattering was measured at incident pion kinetic energies
of 318, 337 and 390 Mev, in the range from 70 to 180 in center-of-mass
scattering angles. At 229 Mev, the angular range from 1500 to 1800c.m.s.
was covered. The technique used was single scattering from a polarized
proton target. Scintillation counter hodoscopes were used to detect
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Arens, John F.; Chamberlain, Owen; Dost, Helmut E.; Hansroul,Michel J.; Holloway, Leland E.; Johnson, Claiborne K. et al. MEASUREMENT OF POLARIZATION IN pi- p ELASTIC SCATTERING FROM 229TO 3 90 MeV, report, September 1, 1967; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc894857/m1/4/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.