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We report a measurement of the spin polarisation of the recoiling neutron indeuterium photodisintegration, utilising a new large acceptance polarimeterwithin the Crystal Ball at MAMI. The measured photon energy range of300~--~700~MeV provides the first measurement of recoil neutron polarisation atphoton 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$E_{\gamma}\sim$~570~MeV is observed, which is inconsistent with currenttheoretical predictions employing nucleon resonance degrees of freedom. ALegendre polynomial decomposition suggests this behaviour could be related tothe excitation of the $d^*(2380)$ hexaquark.

Signatures of the $d^*(2380)$ hexaquark in d($\gamma$,$p\vec{n}$)