动量为6.8BeV/cπ-介子与核子的非弹性作用

本工作共积累了317个非弹性作用事例。作用中的次级带电粒子在(π^--N)质心系中的角分布与动量分布等和前人结果一致,并且基本上可以用边缘碰撞机制来说明。对带有次级质子的事例作了如下分析:(1)计算全部次级粒子(质子除外)在它们自己系统中的总能量ω。作ω分布,并与边缘碰撞1π交换近似计算的理论曲线比较,在ω=1.5BeV附近观察到有突出于理论曲线之外的高峯,并对峯区内事例进行了初步分析。(2)综合我们的和联合原子核研究所的数据,计算了次级质子在镜象系的非弹性系数K_з,并使K_з值的分布与根据Барашенков等人理论计算的K_з分布曲线作了比较。此外,还试从靶质量观点出发,利用Duller-Walker的F图方法,对不同K_з值的各类事例进行了分析和讨论。

INELASTIC COLLISIONS OF 6.8 BeV/c π--MESONS WITH NUCLEONS

This work gives an analysis of 317 inelastic interaction events. The angular and momenta distributions, etc., in the pion-nucleon centre of mass system (C.M.S.), of the secondary charged particles resulted from the collisions agree with the results of previous works and may be compared with the theoretical calculation based on the mechanism of peripheral collision.Those events in which the secondary protons are identified have been analysed as follows: (i) The total energy ω of all secondary particles except the protons in bary-centric system has been computed. The ideogram of ω distribution is given and is compared with the modified theoretical distribution calculated by Barashenkov et al. under the approximation of OPE model. At about ω= 1.5 BeV a peak has been found which is not given by the theoretical curve. Events in this peak have been preliminarily analysed. (2) By using the secondary protons of our events and those events of JINR under the same conditions, the coefficients of inelasticity, K_з, in "mirror" system have been computed. The distribution of K_з is given and is compared with the modified theoretical distribution calculated by Barashenkov et al. under the approximation of OPE model. Moreover, the events of different values of K_з have been analysed and discussed tentatively by means of the concept of target mass and using the method of F plot proposed by Duller Walker.