Signatures of the $d^*(2380)$ hexaquark in d($γ$,$p\vec{n}$)
Research output: Contribution to journal › Letter › peer-review
- 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
Journal | Physical Review Letters |
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Date | Accepted/In press - 2 Mar 2020 |
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Date | Published (current) - 31 Mar 2020 |
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Volume | 124 |
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Number of pages | 6 |
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Pages (from-to) | 1-6 |
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Original language | English |
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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.
© 2020, The Author(s).
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