Signatures of the d∗ (2380) Hexaquark in d (γ,p n →)
- Bashkanov M.
- Watts D. P.
- Kay S. J. D.
- Abt S.
- Achenbach P.
- Adlarson P.
- Afzal F.
- Ahmed Z.
- Akondi C. S.
- Annand J. R. M.
- Arends H. J.
- Beck R.
- Biroth M.
- Borisov N.
- Braghieri A.
- Briscoe W. J.
- Cividini F.
- Collicott C.
- Costanza S.
- Denig A.
- Downie E. J.
- Drexler P.
- Fegan S.
- Fix A.
- Gardner S.
- Ghosal D.
- Glazier D. I.
- Gorodnov I.
- Gradl W.
- Gunther M.
- Gurevich D.
- Heijkenskjold L.
- Hornidge D.
- Huber G. M.
- Kaser A.
- Kashevarov V. L.
- Korolija M.
- Krusche B.
- Lazarev A.
- Livingston K.
- Lutterer S.
- MacGregor I. J. D.
- Manley D. M.
- Martel P. P.
- Miskimen R.
- Mornacchi E.
- Mullen C.
- Neganov A.
- Neiser A.
- Ostrick M.
- Otte P. B.
- Paudyal D.
- Pedroni P.
- Powell A.
- Prakhov S. N.
- Ron G.
- Sarty A.
- Sfienti C.
- Sokhoyan V.
- Spieker K.
- Steffen O.
- Strakovsky I. I.
- Strub T.
- Supek I.
- Thiel A.
- Thiel M.
- Thomas A.
- Usov Y. A.
- Wagner S.
- Walford N. K.
- Werthmuller D.
- Wettig J.
- Wolfes M.
- Zachariou N.
- Zana L. A.
DOIAbstract
We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing 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 polarization 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 polarization in a narrow structure centered around Eγ∼570 MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behavior could be related to the excitation o...
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