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Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 11: Poster Session: Electromagnetic and Hadronic Probes

HK 11.33: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

Study of proton polarimeter of BBS at KVI — •Hamid Reza Amir-Ahmadi, A. van den Berg, R. Castelijns, E. van Garderen, M. Hunyadi, M.A. de Huu, N. Kalantar-Nayestanaki, M. Kiš, H. Löhner, M. Mahjour-Shafiei, S.V. Shende, J. Messchendorp, and H.J. Wörtche — KVI, Groningen, The Netherlands

In order to understand the effect of the three-body force, it is best to study scattering observables in a three-body system, such as cross sections, analyzing power, and spin-transfer coefficients. At KVI a program has been set up to study all these observables. Recently, we have done a part of an experiment, (d,p) elastic scattering, with which we can study the spin-transfer coefficients such as Kyy and (KxxyKyyy). The polarization of the scattered proton is measured with the focal plane polarimeter of the Big-Bite Spectrometer. To measure the polarization of the outgoing proton, a calibration experiment using the (p,p) reaction has been done. A polarized-proton beam of 190 MeV hits a CH2 target and the outgoing proton of this primary reaction is subjected to a secondary scattering from a Carbon sheet in the polarimeter. By calculating the polarization of the protons emerging from the H(p,p) reaction, and measuring the asymmetry of the reaction in the Carbon polarimeter, the average analyzing power of the C(p,p) reaction can be measured. By changing the BBS angle, we measured the average analyzing power in the energy range of 170 MeV down to 60 MeV. This way of using a spectrometer for such an experiment is rather new. In this talk, the results of the polarimeter calibration will be discussed.

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