Signatures of the d^{*}(2380) Hexaquark in d(γ,pn[over →]).
作者信息
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, Günther M, Gurevich D, Heijkenskjöld L, Hornidge D, Huber G M, Käser 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 Yu A, Wagner S, Walford N K, Werthmüller D, Wettig J, Wolfes M, Zachariou N, Zana L A
机构信息
Department of Physics, University of York, Heslington, York Y010 5DD, United Kingdom.
University of Regina, Regina, SK S4S0A2 Canada.
出版信息
Phys Rev Lett. 2020 Apr 3;124(13):132001. doi: 10.1103/PhysRevLett.124.132001.
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 E_{γ}∼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 of the d^{*}(2380) hexaquark.
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