英语翻译When an incident particle comes close to the target,it i

英语翻译
When an incident particle comes close to the target,it is deflected.In a typical experiment,the scattered particles are counted in a detector that is far from the target.The final velocity of the scattered particles is v',and the angle between v and v' is the scattering angle 6.
Let us assume that the scattering is elastic and that the target is much more massive than the beam particles so that the target can be considered to be fixed.(The latter condition can be relaxed by using center of mass coordinates.) We also assume that no incident particle is scattered more than once.These considerations imply that the initial speed and final speed of the incident particles are equal.The functional dependence of 9 on b depends on the force on the beam particles due to the target.In a typical experiment,the number of particles in an angular region between 9 and 9 + dO is detected for many values of 9.These detectors measure the number of particles scattered into the solid angle （公式） centered about 9.The differential cross section a (9) is defined by the relation （公式）where dN is the number of particles scattered into the solid angle dQ centered about 9 and
the azimuthal angle ¢,N is the total number of particles in the beam,and n is the target density defined as the number of targets per unit area.
9是一个希腊字母,打不出来

When an incident particle comes close to the target,it is deflected.In a typical experiment,the scattered particles are counted in a detector that is far from the target.The final velocity of the scattered particles is v',and the angle between v and v' is the scattering angle 6.
当一个入射粒子接近它的标靶时,它会被偏转.在典型的实验中,散射粒子由一个远离标靶的探测器计数.散射粒子的最终速度是v',而v和v'之间的角度是散射角b.（不应该是6哦,从下文看,应该是b,或者希腊字母）
Let us assume that the scattering is elastic and that the target is much more massive than the beam particles so that the target can be considered to be fixed.(The latter condition can be relaxed by using center of mass coordinates.) We also assume that no incident particle is scattered more than once.These considerations imply that the initial speed and final speed of the incident particles are equal.The functional dependence of 9 on b depends on the force on the beam particles due to the target.
让我们假定散射是弹性的并且标靶的质量远大于粒子束中的粒子质量以至于标靶可以被认为是固定的.（后一个条件其实可以放宽,只要使用质心坐标系）我们也假设没有一个入射粒子将被散射超过一次.这些考虑意味着入射粒子的初始速度和最终速度（大小）即速率将一样.9（不知道什么希腊字母,还是用9代替）对于b的函数依赖关系是取决于粒子束中的粒子所受到的来自标靶的作用力.
In a typical experiment,the number of particles in an angular region between 9 and 9 + dO is detected for many values of 9.These detectors measure the number of particles scattered into the solid angle （公式） centered about 9.The differential cross section a (9) is defined by the relation （公式）where dN is the number of particles scattered into the solid angle dQ centered about 9 and the azimuthal angle ¢,N is the total number of particles in the beam,and n is the target density defined as the number of targets per unit area.
在一个典型的实验中,对于很多（不同的）9值,在角度介于9和9+dO的范围内的粒子的数目被探测到.这些探测器测量位于以9为中心的立体角（公式）内的被散射粒子数目.
微分散射截面a（9）由以下关系定义：（公式）,
其中dQ是以9和方位角¢为中心的立体角,dN是散射到dQ这个立体角内的粒子数目,N是粒子束中的粒子总数,而n是标靶密度,被定义为单位面积内的标靶数目.