Summary
Elastic and inelastic scattering angular distributions of 87 MeV positive pions on carbon and oxygen were measured with a total absorption scintillation spectrometer of high energy resolution. The elastic angular distributions are identical within the experimental error with those, measured for 87.5 MeV negative pions by Edelstein. The data can be fitted with the Kisslinger theory. The inelastic angular distributions are strongly peaked in the backward direction. The inelastic differential cross section even appreciably surpasses the elastic cross section at angles above about 100°. At several angles a peak is seen in the energy spectra of pions scattered from carbon, which has to be explained as resulting from quasi-free pion nucleon scattering.
Riassunto
A mezzo di uno spettrometro a scintillazione con assorbimento totale di elevata risoluzione energetica, si sono misurate le distribuzioni angolari dello scattering elastico ed anelastico di pioni positivi di 87 MeV su carbonio ed ossigeno. Le distribuzioni angolari elastiche sono identiche, entro gli errori sperimentali, a quelle misurate da Edelstein per i pioni negativi di 87.5 MeV. I dati possono essere messi in accordo con la teoria di Kisslinger. Le distribuzioni angolari anelastiche hanno un forte picco indietro. Anche la sezione differenziale d’urto anelastico supera apprezzabilmente la sezione d’urto elastico ad angoli superiori a circa 100°. Per parecchi angoli si riscontra negli spettri dei pioni diffusi su carbonio un picco che si deve spiegare come il risultato dello scattering fra pioni quasi liberi e nucleoni.
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References
W. F. Baker, J. Rainwater andR. E. Williams:Phys. Rev.,112, 1763 (1958).
R. M. Edelstein: Columbia University (N. Y.) Nevis Cyclotron Laboratory, Report Nevis 88 (1960). After the preparation of this paper the work of Edelstein has been published inPhys. Rev.,122, 252 (1961).
F. P. G. Valckx andA. Dymanus:Nucl. Instr.,7, 197 (1960).
F. P. G. Valckx:Nucl. Instr.,10, 234 (1961).
R. L. Garwin:Rev. Sci. Instr.,24, 618 (1953).
J. J. Van Zolingen:Ned. T. Natuurk.,23, 42 (1957).
G. Ferrari:Proceedings of the 1956 CERN Symposium,2, 230 (1956).
W. F. Baker, H. Byfield andJ. Rainwater:Phys. Rev.,112, 1773 (1958).
L. S. Kisslinger:Phys. Rev.,98, 761 (1955).
R. Hofstadter:Rev. Mod. Phys.,28, 214 (1956).
A. E. Ignatenko:Proceedings of the 1956 CERN Symposium,2, 320 (1956).
A. M. Sacks, H. Winick andB. A. Wooten:Phys. Rev.,109, 1750 (1958).
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This work is part of the research program of the « Stichting voor Fundamenteel Onderzoek der Materie » and was made possible by financial support of the « Nederlandse Organisatie voor Zuiver Wetenschappelijk Onderzoek » and of the « Ministerie van Onderwijs, Kunsten en Wetenschappen ».
The help of Dr.A. Dymanus andB. M. K. Nefkens in the initial stage of this experiment has been much appreciated.
Also the technical assistance ofB. A. Strasters has been of great help.
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Valckx, F.P.G., Gelsema, E.S. & Kruiskamp, M. The scattering of 87 MeV positive pions on carbon and oxygen. Nuovo Cim 23, 1005–1020 (1962). https://doi.org/10.1007/BF02731255
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DOI: https://doi.org/10.1007/BF02731255