ZGOUBI USERS' GUIDE - HEP

78 4 DESCRIPTION OF THE AVAILABLE PROCEDURESü>Š2 > w 32 T ·@·2 P andŠwqÅww·É@·£2 PwqCIBLE or TARGET: Generate a secondary beam from target interactionThe reaction is qwith the following parameters @ wU RLaboratory momentumRest massTotal energy in laboratory7 º \€ > € T € P€2 > 2 T 2 P297287> % > % T % PThe geometry of the interaction is shown in Fig. 17.The angular sampling at the exit of the target consists £ of the o„coordinates 0,the median plane, £©¥ and the o ¥ V¥ £#¥ ·V¥@coordinates 0,, o... oo , o ...in the vertical plane.The position of ¡ downstream is deduced from that of ´ upstream by a transformation equivalent to two transformationsusing CHANGREF, namelyVS VS· @infollowed by§ ² ¢ ² ¢ K\ " CHANGREFALE ɧ ² ¢ ² ¢ †\ " CHANGREFALE Å ‡BParticle 4 is discarded, while particle 3 continues. The energy loss Ò is related to the variable massby297w (2 PThe momentum sampling of particle 3 is derived from conservation of energy and momentum, according toÒ Ò 297% T % P % > € >€ >€ > T w @ € > € T & QP > Figure 17: Scheme of the principles of CIBLE (TARGET)= position, angle of incoming particle 2 in the entrance reference frame´þ"/position of the interaction"/¡¥== position, angle of the secondary particle in the exit reference frame= angle between entrance and exit framesÅÉ = tilt angle of the target