Comparison of forward and backward pp pair knockout in 3He(e,e′pp)n
Comparison of forward and backward pp pair knockout in 3He(e,e′pp)n
复制标题
3He(e,e′pp)n中前向和后向pp对敲除的比较
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
The Clas Collaboration
中科院分区：
文献类型：
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作者：
H. Baghdasaryan;L. Weinstein;J. Laget;The Clas Collaboration
测量核子-核子短程关联(SRC)多年来一直是核物理界追求的目标。它们是核波函数的重要组成部分，几乎占据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则更加困难。为了确定研究SRC动量分布的最佳组态，我们测量了3He(e，e‘pp)n反应，观察了具有高动量质子(pp>；0.35GeV/c)和低动量中子(pn<；0.2GeV/c)的事件。我们考察了两种角度构型：两个质子都向前发射，或者一个质子向前发射，一个向后发射(相对于动量转移，→Q)。因此，测量的具有一个前向和一个后向质子的事件的相对动量分布更接近于计算的初态pp相对动量分布，这表明这是测量SRC的首选构型。
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 3He(e,e'pp)n reaction, looking at events with high momentum protons (pp > 0.35 GeV/c) and a low momentum neutron (pn < 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, →q). Thus, 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.