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

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  • A2 Collaboration at MAMI


Publication details

JournalPhysical Review Letters
DateAccepted/In press - 2 Mar 2020
DatePublished (current) - 31 Mar 2020
Number of pages6
Pages (from-to)1-6
Original languageEnglish


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 $E_{\gamma}\sim$~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.

Bibliographical note

© 2020, The Author(s).

    Research areas

  • nucl-ex

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