Nucleon-nucleon correlations in exotic nuclei

核基态波函数具有非常明显的高动量分量的混合，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，在很短的距离内，存在着强关联的中子-质子对，就像它们在氚中或在自由散射过程中一样。当一个“裸露的”核子在核介质中移动时，在NN相互作用的情况下，大约有20%的时间，它会“披上”一层准氚云。尽管这一比例很小(~20%)，但SRCs对我们理解核物理中长期存在的困惑和对中子物质的理解具有重要意义。上述定性论证表明，氚的准自由散射(QFS)可以为检验这些概念提供一个灵敏的探针。我们将在GSI/FIRE的R3B装置上进行实验，以测量在10，14，16C中相对于12C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.