Summary
Energy sensitive counters of the Čerenkov or scintillation type were used in conjunction with a pulse height analyzer to measure the energy spectrum of 150 MeV negative pions scattered from carbon or lead at various angles. Most of the pions scattered into the backward hemisphere had an energy less than 40 MeV. This is in contrast to the result of a Monte Carlo calculation based on a simple Fermi gas model, in which most of the pions scattered backwards have energies above 60 MeV. The measurements indicate that the absorption of pions by carbon is about that predicted by the Monte Carlo calculation, while the absorption by lead is about 1/4 that expected.
Riassunto
Si sono usati contatori di Čerenkov o a scintillazione sensibili all’energia collegati ad un analizzatore dell’altezza degli impulsi per misurare lo spettro d’energia di pioni negativi di 150 MeV dopo scattering a vari angoli su carbonio o piombo. La maggioranza dei pioni si trovò nell’emisfero posteriore con energia inferiore a 40 MeV. Ciò è in contrasto coi risultati di un Montecarlo basato su un semplice modello di un gas di Fermi in oui la maggioranza dei pioni diffusi aU’indietro hanno energie superiori a 60 MeV. Le misure indicano che l’assorbimento dei pioni in carbonio corrisponde approssimativamente a quello predetto dal Montecarlo, inentre l’assorbimento in piombo è circa 1/4 del previsto.
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Eesearch supported by a joint program of the Office of Naval Eesearch and the U.S. Atomic Energy Commission.
Based on a thesis submitted to the Faculty of the Department of Physics, the University of Chicago, in partial fulfilment of the requirements for the Ph.D. degree.
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Miller, E.H. Inelastic scattering of 150 MeV negative pions by carbon and lead. Nuovo Cim 6, 882–911 (1957). https://doi.org/10.1007/BF02745815
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DOI: https://doi.org/10.1007/BF02745815