Fegan, Stuart orcid.org/0000-0003-2523-5247, Fix, A., Mullen, C. et al. (28 more authors) (2020) Signatures of the $d^*(2380)$ hexaquark in d($γ$,$p\vec{n}$). Physical Review Letters. 132001. pp. 1-6. ISSN 1079-7114
Abstract
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020, The Author(s). |
Keywords: | nucl-ex |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 06 Apr 2020 11:40 |
Last Modified: | 23 Jan 2025 00:22 |
Published Version: | https://doi.org/10.1103/PhysRevLett.124.132001 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevLett.124.132001 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:159214 |