~ 3 He（e，e 'pp）n正向和反向pp对敲除的比较
A comparison of forward and backward pp pair knockout in 3He(e,e'pp)n
摘要：
测量核子-核子短程相关性（SRC）多年来一直是核物理界的目标。它们是核波函数的重要组成部分，几乎占了所有的高动量强度。它们与EMC效应密切相关。虽然它们的总体概率已经被测量，但测量它们的动量分布更困难。为了确定研究SRC动量分布的最佳配置，我们测量了$^3$ He $(e,e'pp)n$反应，观察高动量质子（$p_p > 0.35$ GeV/c）和低动量中子（$p_n< 0.2$ GeV/c）的事件。我们研究了两种角度的配置：要么两个质子发射向前或一个质子发射向前和一个向后（相对于动量转移，$\vec q$）。测量的相对动量分布的事件与一个向前和一个向后的质子更接近计算的初始状态$pp$相对动量分布，这表明这是测量SRC的首选配置。
英文摘要：
Measuring nucleon-nucleon Short Range Correlations (SRC) has been a goal of the nuclear physics community for many years. They are an important part of the nuclear wavefunction, accounting for almost all of the high-momentum strength. They are closely related to the EMC effect. While their overall probability has been measured, measuring their momentum distributions is more difficult. In order to determine the best configuration for studying SRC momentum distributions, we measured the $^3$He$(e,e'pp)n$ reaction, looking at events with high momentum protons ($p_p > 0.35$ GeV/c) and a low momentum neutron ($p_n< 0.2$ GeV/c). We examined two angular configurations: either both protons emitted forward or one proton emitted forward and one backward (with respect to the momentum transfer, $\vec q$). The measured relative momentum distribution of the events with one forward and one backward proton was much closer to the calculated initial-state $pp$ relative momentum distribution, indicating that this is the preferred configuration for measuring SRC.
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