Experiments with High-Energy Polarized Protons

Radiation Laboretory, i)epa*ment of h y s i o 8 , Fniversity o f S ~ l f f a r s i a Berkeley, California beams and their scattering properties. We also have bean mattering protons i n the Berkeley oyclotron and investigating t h e i r p o l ~ r i e a t i o a by double rroattttring experilnrenta and we wish to give at this time a progress report b o a u s e the deta so far oolleated appear o f intereat. The beam i s p o l a r i m d by soattering on target A of baryllSuxn or oarbon (Pig. 1) and is d e l l e o t e d by a steering = p e t experimcntd area (uave). into the s h i e l b d The angle of scattaringu/ in a horizont~lplane m d at target A varies betamen 17O m l 20O 'in different experiments. c The energy Eo of t h e p r i m r y beam is 340 WV* The scattered barn, Follms rsrn o r b i t as drawn in Fig. 1 and i t a energy is approximately E o w s 2 W y c if it imderrrsnt an w e, elastic sootkering on rs. free nucleon. E it3 measured by t a g s determina- tion* The following experiments show t h a t the beam bedt;men targets A and B i s polaricedr angle A second scatterer E, i n the aava, rsuatters the barn by aa To o o n p l e t s l y d e f i n e the d i r e c t i o n o f the a o ~ t t s r e d beam we