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 K_y^y′ and (K_xx^y′− K_yy^y′). 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.