Summary
The 135 MeV polarized proton beam, obtained from the Harwell cyclotron by scattering to the left from carbon, has been slowed down to give protons of energy less than 10 MeV, and these protons have then been scattered by helium. The ratio of the intensities scattered at the same angle to left and right of the incident beam has been measured with photographic plates. This ratio, together with a phase shift calculation of the polarization produced in proton-helium scattering, gives the direction of the polarization produced in the first scattering. -The observed direction agrees with that predicted theoretically on the assumption that the spin-orbit interaction in high energy nuclear scattering is the same as in the shell model of the nucleus.
Riassunto
Il fascio polarizzato di protoni ottenuto dal ciclotrone di Harwell per mezzo di scattering a sinistra su carbonio è stato rallentato per ottenere protoni di energia inferiore a 10 MeV e a questi protoni si fa subire uno scattering su elio. Il rapporto delle intensità diffuse sotto lo stesso angolo a destra o a sinistra del fascio incidente è stato misurato con lastre fotografiche. Tale rapporto in unione ad un calcolo in sfasamento della polarizzazione prodotta nello scattering dei protoni su elio dà la direzione della polarizzazione prodotta nel primo scattering. La direzione osservata si accorda con quella prevista dalla teoria facendo l’ipotesi che l’interazione spin-orbita nello scattering nucleare delle alte energie sia la stessa che nel modello a shell.
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Brinkworth, M.J., Rose, B. A measurement of the direction of the polarization produced in the scattering of 135 MeV protons. Nuovo Cim 3, 195–202 (1956). https://doi.org/10.1007/BF02746209
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DOI: https://doi.org/10.1007/BF02746209