Nucleon-nucleon correlations in exotic nuclei

核基态波函数有一个非常明显的高动量成分的混合物，现在被理解为起源于短程核子-核子（NN）关联（SRC）。事实上，实验证据表明，在短距离内存在强关联的中子-质子对，就像它们在氘核或自由散射过程中一样。当核子在核介质中移动时，在NN相互作用的存在下，一个“裸”核子大约有20%的时间会被一个准氘云“装扮”。尽管这个比例很小（约20%），但SRC对我们理解核物理中长期存在的难题以及我们对中子物质的理解具有重要意义。上述定性的论点表明，准自由散射（QFS）的氘核可以提供一个敏感的探针来检查这些概念。我们将在GSI/FAIR的R3 B装置上进行实验，以测量10，14，16 C中相对于12 C的（p，pd）准自由散射截面。

The nuclear ground-state wavefunction has a very marked admixture of high-momentum components, which are now understood to originate from short-range nucleon-nucleon (NN) correlations (SRC). Indeed, the experimental evidence points to the existence, at short distances, of strongly correlated neutron-proton pairs much like they are in the deuteron or in free scattering processes. As it moves through the nuclear medium, a "bare" nucleon in the presence of the NN interaction becomes "dressed" with a quasi-deuteron cloud, about 20% of the time. Despite this small percentage (~20%), SRCs have significant implications to our understanding of long-standing puzzles in nuclear physics and to our understanding of neutron matter. The qualitative arguments above, suggest that quasi-free scattering (QFS) of deuterons could offer a sensitive probe to examine these concepts. We will perform an experiment at the R3B setup at GSI/FAIR to measure at the (p,pd) quasi-free scattering cross section for knocking out a deuteron in 10,14,16C relative to 12C.