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Old Dominion University, Norfolk, Virginia 23529, USA.
Phys Rev Lett. 2004 Feb 6;92(5):052303. doi: 10.1103/PhysRevLett.92.052303.
We have measured the 3He(e,e'pp)n reaction at 2.2 GeV over a wide kinematic range. The kinetic energy distribution for "fast" nucleons (p>250 MeV/c) peaks where two nucleons each have 20% or less, and the third nucleon has most of the transferred energy. These fast pp and pn pairs are back to back with little momentum along the three-momentum transfer, indicating that they are spectators. Calculations by Sargsian and by Laget also indicate that we have measured distorted two-nucleon momentum distributions by striking one nucleon and detecting the spectator correlated pair.
我们在2.2 GeV的能量下，在很宽的运动学范围内测量了³He（e，e'pp）n反应。“快”核子（p>250 MeV/c）的动能分布峰值出现在两个核子各自具有20%或更低的能量，而第三个核子具有大部分转移能量的地方。这些快质子-质子对和质子-中子对在三动量转移方向上几乎没有动量，且背靠背，这表明它们是旁观者。萨尔吉扬和拉热的计算也表明，我们通过撞击一个核子并探测相关的旁观者对，测量到了扭曲的双核子动量分布。
