Year: 2020
Type: article
Abstract: 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.
Source: Physical Review Letters
Authors: M. Bashkanov, D. P. Watts, S. J. D. Kay, S. Abt, P. Achenbach, P. Adlarson, F. Afzal, Z. Ahmed, C. S. Akondi, J. R. M. Annand, H. J. Arends, R. Beck, M. Biroth, N. Borisov, A. Braghieri, W. J. Briscoe, F. Cividini, C. Collicott, S. Costanza, A. Denig, E. J. Downie, P. Drexler, S. Fegan, A. Fix, S. Gardner, D. Ghosal, D. I. Glazier, I. Gorodnov, W. Gradl, M. Günther, D. Gurevich, L. Heijkenskjöld, D. Hornidge, G. M. Huber, A. Käser, V. L. Kashevarov, M. Korolija, B. Krusche, A. Lazarev, K. Livingston, S. Lutterer, I. J. D. MacGregor, D. M. Manley, P. P. Martel, R. Miskimen, E. Mornacchi, 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, D. Werthmüller, J. Wettig, M. Wolfes, N. Zachariou, L. A. Zana
Institutions: University of York, University of Regina, University of Basel, Johannes Gutenberg University Mainz, University of Bonn, Kent State University, University of Glasgow, Joint Institute for Nuclear Research, Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, George Washington University, Saint Mary's University, University of Pavia, Justus-Liebig-Universität Gießen, Tomsk Polytechnic University, Institute for Nuclear Research, Mount Allison University, Ruđer Bošković Institute, University of Massachusetts Amherst, University of California, Los Angeles, Hebrew University of Jerusalem, Thomas Jefferson National Accelerator Facility
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,750
Funders: National Science Foundation, U.S. Department of Energy, Deutsche Forschungsgemeinschaft, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Russian Foundation for Basic Research, Natural Sciences and Engineering Research Council of Canada, Science and Technology Facilities Council, Instituto Nazionale di Fisica Nucleare, Office of International Science and Engineering, Nuclear Physics
Awards: MEDIUM ENERGY NUCLEAR PHYSICS, G1861050445, G222768804, PRECISION STUDIES OF QCD AND ELECTRO-WEAK INTERACTIONS, G2413970849, Erforschung der Möglichkeiten der Bildspektrometrie als Methode der Umweltanalytik in der Erdbeobachtung, Investigation of the Strong Interaction: Elementary Systems and Nuclei, Probing Nucleon Structure Through Muon and Photon Scattering, INVESTIGATIONS OF BARYON SPECTROSCOPY VIA ELECTROMAGNETIC AND HADRONIC SCATTERING, G3795454412, Hunt for Exotic Particles: Dibaryons, G3895161700, Edinburgh Nuclear Physics Group Consolidated Grant Proposal, Differentiation of smooth muscle cells. The development of structural and functional characteristics, G4046832244, Investigation of the Strong Interaction: Elementary Systems and Nuclei, G4824140319, G5227872176, Investigation of the Strong Interaction: Elementary Systems and Nuclei, Chaire De Recherche Du Canada En Environnement Et Bilan Énergétique., G5599649393, EXPERIMENTAL INVESTIGATIONS OF HADRON SPECTROSCOPY AT ACCELERATOR FACILITIES, Shining a light on strangeness, G628552264, DATA ANALYSIS CENTER FOR ELECTROMAGNETIC AND HADRONIC SCATTERING PROCESSES, Investigations of the Strong Interaction, Shining a light on strangeness, Transfer of Research Grant Funds (from ST/P004008/1 to ST/P003885/1), Investigations of the Strong Interaction, G723336386, BARYON SPECTROSCOPY THROUGH PARTIAL-WAVE ANALYSIS AND MESON PHOTOPRODUCTION, G7464526398, Exploring new states of matter (New Applicant scheme), IRES -Experimental Nuclear Physics at the Mainz Microtron, G8187754661, Hunt for Exotic Particles: Dibaryons, Collaborative Research: COSEE: Ocean Communities in Education And social Networks (COSEE-OCEAN)
OpenAlex ID: W2991552201