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| Journal Article | PreJuSER-39431 |
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1999
North-Holland Publ. Co.
Amsterdam
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Please use a persistent id in citations: doi:10.1016/S0168-9002(99)00014-5
Abstract: We present a method to determine precisely the absolute momentum of the external proton beam from the Julich Cooler Synchrotron COSY near 1930 MeV/c. In the pp --> d pi(+) reaction at 1930.477 MeV/c incident beam momentum, the forward going pions (theta(c.m.) = 0 degrees) and the backward going deuterons (theta(c.m.) = 180 degrees) have the same laboratory momentum. Such coincident pion-deuteron events are detected in the focal plane of the magnetic spectrometer BIG KARL located at theta(lab) = 0 degrees. Using the nearly linear dependence of the difference between the measured pion and deuteron momenta as a function of the proton beam momentum, the absolute momentum of the external proton beam from COSY near 1930 MeV/c was determined with a precision of 5.2 x 10(-5). (C) 1999 Elsevier Science B.V. All rights reserved.
Keyword(s): J ; proton beam (auto) ; pions (auto) ; deuterons (auto) ; 1930 MeV c (auto)
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