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  1. Article ; Online: Signatures of the d^{*}(2380) Hexaquark in d(γ,pn[over →]).

    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

    Physical review letters

    2020  Volume 124, Issue 13, Page(s) 132001

    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 ... ...

    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.
    Language English
    Publishing date 2020-04-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.124.132001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Helicity-Dependent Cross Sections for the Photoproduction of π^{0} Pairs from Nucleons.

    Dieterle, M / Witthauer, L / Fix, A / Abt, S / Achenbach, P / Adlarson, P / Afzal, F / Aguar Bartolome, P / Ahmed, Z / Annand, J R M / Arends, H J / Bashkanov, M / Beck, R / Biroth, M / Borisov, N / Braghieri, A / Briscoe, W J / Cividini, F / Collicott, C /
    Costanza, S / Denig, A / Dolzhikov, A S / Downie, E J / Drexler, P / 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 / Kay, S / Keshelashvili, I / Kondratiev, R / Korolija, M / Krusche, B / Lazarev, A / Lisin, V / Livingston, K / Lutterer, S / MacGregor, I J D / Manley, D M / Martel, P P / Metag, V / Meyer, W / Middleton, D G / Miskimen, R / Mornacchi, E / Mullen, C / Mushkarenkov, A / Neganov, A / Neiser, A / Oberle, M / Ostrick, M / Otte, P B / Paudyal, D / Pedroni, P / Polonski, A / Powell, A / Prakhov, S N / Reicherz, G / Ron, G / Rostomyan, T / Sarty, A / Sfienti, C / Sokhoyan, V / Spieker, K / Steffen, O / Strakovsky, I I / Strub, T / Supek, I / Thiel, A / Thiel, M / Thomas, A / Unverzagt, M / Usov, Yu A / Wagner, S / Walford, N K / Watts, D P / Werthmüller, D / Wettig, J / Wolfes, M / Zana, L A

    Physical review letters

    2020  Volume 125, Issue 6, Page(s) 62001

    Abstract: The double-polarization observable E and helicity-dependent cross sections σ_{1/2}, σ_{3/2} have been measured for the photoproduction of π^{0} pairs off quasifree protons and neutrons at the Mainz MAMI accelerator with the Crystal Ball/TAPS setup. A ... ...

    Abstract The double-polarization observable E and helicity-dependent cross sections σ_{1/2}, σ_{3/2} have been measured for the photoproduction of π^{0} pairs off quasifree protons and neutrons at the Mainz MAMI accelerator with the Crystal Ball/TAPS setup. A circularly polarized photon beam was produced by bremsstrahlung from longitudinally polarized electrons and impinged on a longitudinally polarized deuterated butanol target. The reaction products were detected with an almost 4π covering calorimeter. The results reveal for the first time the helicity- and isospin-dependent structure of the γN→Nπ^{0}π^{0} reaction. They are compared to predictions from reaction models in view of nucleon resonance contributions and also to a refit of one model that predicted results for the proton and for the neutron target. The comparison of the prediction and the refit demonstrates the large impact of the new data.
    Language English
    Publishing date 2020-08-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.062001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 4' 58/153: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

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  3. Book ; Online: Measurement of the omega -> pi^0 e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI

    Adlarson, P. / Afzal, F. / Aguar-Bartolomé, P. / Ahmed, Z. / Annand, J. R. M. / Arends, H. J. / Bantawa, K. / Beck, R. / Berghäuser, H. / Biroth, M. / Borisov, N. S. / Braghieri, A. / Briscoe, W. J. / Cherepnya, S. / Cividini, F. / Collicott, C. / Costanza, S. / Danilkin, I. V. / Denig, A. /
    Dieterle, M. / Downie, E. J. / Drexler, P. / Bondy, M. I. Ferretti / Fil'kov, L. V. / Gardner, S. / Garni, S. / Glazier, D. I. / Glowa, D. / Gradl, W. / Gurevich, G. M. / Hamilton, D. J. / Hornidge, D. / Huber, G. M. / Jude, T. C. / Käser, A. / Kashevarov, V. L. / Kay, S. / Keshelashvili, I. / Kondratiev, R. / Korolija, M. / Krusche, B. / Lazarev, A. / Linturi, J. / Lisin, V. / Livingston, K. / MacGregor, I. J. D. / Macrae, R. / Manley, D. M. / Martel, P. P. / McGeorge, J. C. / McNicoll, E. F. / Metag, V. / Middleton, D. G. / Miskimen, R. / Mornacchi, E. / Mullen, C. / Mushkarenkov, A. / Neganov, A. / Neiser, A. / Nikolaev, A. / Oberle, M. / Ostrick, M. / Ott, P. / Otte, P. B. / Paudyal, D. / Pedroni, P. / Polonski, A. / Prakhov, S. / Rajabi, A. / Robinson, J. / Ron, G. / Rosner, G. / Rostomyan, T. / Sfienti, C. / Sikora, M. H. / Sokhoyan, V. / Spieker, K. / Steffen, O. / Strakovsky, I. I. / Strandberg, B. / Strub, Th. / Supek, I. / Thiel, A. / Thiel, M. / Thomas, A. / Unverzagt, M. / Usov, Yu. A. / Wagner, S. / Walford, N. / Watts, D. P. / Werthmüller, D. / Wettig, J. / Witthauer, L. / Wolfes, M. / Zana, L. A.

    2016  

    Abstract: The Dalitz decays eta -> e^+e^-g and omega -> pi^0 e^+e^- have been measured in the g p -> eta p and g p -> omega p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of ... ...

    Abstract The Dalitz decays eta -> e^+e^-g and omega -> pi^0 e^+e^- have been measured in the g p -> eta p and g p -> omega p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the electromagnetic transition form factor of eta, Lambda^{-2}_eta=(1.97+/-0.11_tot) GeV^{-2}, is in good agreement with previous measurements of the eta -> e^+e^-g and eta -> mu^+mu^-g decays. The uncertainty obtained in the value of Lambda^{-2}_eta is lower than in previous results based on the eta -> e^+e^-g decay. The value obtained for the omega slope parameter, Lambda^{-2}_omega_pi^0 = (1.99+/-0.21_tot) GeV^{-2}, is somewhat lower than previous measurements based on omega -> pi^0 mu^+mu^-, but the results for the omega transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.

    Comment: 19 figures, 2 tables
    Keywords High Energy Physics - Experiment ; Nuclear Experiment
    Subject code 551
    Publishing date 2016-09-15
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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