d中$d^*(2380)$六夸克（$γ$，$p\vec{n}$）的签名
Signatures of the $d^*(2380)$ hexaquark in d($γ$,$p\vec{n}$)
摘要：
我们报告的测量反冲中子在氘光致衰变的自旋极化，利用一个新的大接受旋光计内的水晶球在MAMI。测量的光子能量范围为300~--~700~MeV，首次测量了在氘核夸克子结构起作用的光子能量下的反冲中子极化，从而为光致衰变机制提供了重要的新约束。在一个以$E_γ\sim$ ~570 MeV为中心的窄结构中观察到一个非常高的中子极化，这与目前采用核子共振自由度的理论预测不一致。勒让德多项式分解表明，这种行为可能与$d^*(2380)$六夸克的激发有关。
英文摘要：
We report a measurement of the spin polarisation of the recoiling neutron in deuterium photodisintegration, utilising a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300~--~700~MeV provides the first measurement of recoil neutron polarisation at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarisation in a narrow structure centred around $E_γ\sim$~570~MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behaviour could be related to the excitation of the $d^*(2380)$ hexaquark.
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