The radiation and ionization energy loss are presented for single arm Monte Carlo simulation for the GDH sum rule experiment in Hall-A at Jefferson Lab. Radiation and ionization energy loss are discussed for 12 C elastic scattering simulation. The relative momentum ratio ∆p p and 12 C elastic cross section are compared without and with radiative energy loss and a reasonable shape is obtained by the simulation. The total energy loss distribution is obtained, showing a Landau shape for 12 C elastic scattering. This simulation work will give good support for radiation correction analysis of the GDH sum rule experiment.

The Aapolai-tzation is analyzed with the expel-itnental data i n S f Pb colloioris at energy 200 GeV per niicleon , which were produced at SPS o j CERN The small polarization w l u e and the cori-elation between the transverse polarization and tramvet se mnmne?ctum were obtained in Feynman pa?-ametei-xF > 0, x F < 0 and aL1 x F The results show that the non-polarizatwn of lambd a appal-s i n the region of larger trans'oet-se momenta, say, at 1 -2 G e V / c i?i PT The origzns of polarization reduction are discussed