By the same authors

From the same journal

From the same journal

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

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  • A2 Collaboration at MAMI
  • Stuart Fegan
  • A. Fix
  • C. Mullen
  • A. Neganov
  • A. Neiser
  • M. Ostrick
  • P. B. Otte
  • D. Paudyal
  • P. Pedroni
  • A Powell
  • S. N. Prakhov
  • G. Ron
  • A Sarty
  • C. Sfienti
  • V. Sokhoyan
  • K. Spieker
  • O Steffen
  • I.I. Strakovsky
  • T. Strub
  • I Supek
  • A. Thiel
  • M Thiel
  • A. Thomas
  • Yu A. Usov
  • S Wagner
  • N.K. Walford
  • Dominik Werthmüller
  • J. Wettig
  • M. Wolfes
  • Nick Zachariou
  • L A Zana


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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