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  1. Article ; Online: First Measurement Using Elliptically Polarized Photons of the Double-Polarization Observable E for γp→pπ^{0} and γp→nπ^{+}.

    Afzal, F / Spieker, K / Hurck, P / Abt, S / Achenbach, P / Adlarson, P / Ahmed, Z / Akondi, C S / 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 / Dieterle, M / Downie, E J / Drexler, P / Fegan, S / Gardner, S / Ghosal, D / Glazier, D I / Gorodnov, I / Gradl, W / Gurevich, D / Heijkenskjöld, L / Hornidge, D / Huber, G M / Kashevarov, V L / Kay, S J D / Korolija, M / Krusche, B / Lazarev, A / Livingston, K / Lutterer, S / MacGregor, I J D / Macrae, R G / Manley, D M / Martel, P P / Miskimen, R / Mocanu, M / Mornacchi, E / Mullen, C / Neganov, A / Neiser, A / Oberle, M / Ostrick, M / Otte, P B / Paudyal, D / Pedroni, P / Powell, A / Reicherz, G / Rostomyan, T / Sfienti, C / Sokhoyan, V / Steffen, O / Strakovsky, I I / Strub, T / Supek, I / Thiel, A / Thiel, M / Thomas, A / Usov, Yu A / Wagner, S / Walford, N K / Watts, D P / Werthmüller, D / Wettig, J / Witthauer, L / Wolfes, M / Zachariou, N

    Physical review letters

    2024  Volume 132, Issue 12, Page(s) 121902

    Abstract: We report the measurement of the helicity asymmetry E for the pπ^{0} and nπ^{+} final states using, for the first time, an elliptically polarized photon beam in combination with a longitudinally polarized target at the Crystal Ball experiment at MAMI. ... ...

    Abstract We report the measurement of the helicity asymmetry E for the pπ^{0} and nπ^{+} final states using, for the first time, an elliptically polarized photon beam in combination with a longitudinally polarized target at the Crystal Ball experiment at MAMI. The results agree very well with data that were taken with a circularly polarized photon beam, showing that it is possible to simultaneously measure polarization observables that require linearly (e.g., G) and circularly polarized photons (e.g., E) and a longitudinally polarized target. The new data cover a photon energy range 270-1400 MeV for the pπ^{0} final state (230-842 MeV for the nπ^{+} final state) and the full range of pion polar angles, θ, providing the most precise measurement of the observable E. A moment analysis gives a clear observation of the pη cusp in the pπ^{0} final state.
    Language English
    Publishing date 2024-04-05
    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.132.121902
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book: Heretik

    Supek, Ivan / Zima, Zdravko

    (Biblioteka Hrvatski povijesni roman)

    1995  

    Author's details Ivan Supek. Priredio Zdravko Zima
    Series title Biblioteka Hrvatski povijesni roman
    Size 340 S, Ill
    Publisher Školska Knjiga
    Publishing place Zagreb
    Document type Book
    ISBN 9530603231 ; 9789530603233
    Database Former special subject collection: coastal and deep sea fishing

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  3. 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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  4. Article ; Online: Single

    Mullen, C / Gardner, S / Glazier, D I / Kay, S J D / Livingston, K / Strakovsky, I I / Workman, R L / Abt, S / Achenbach, P / Afzal, F / Ahmed, Z / Akondi, C S / Annand, J R M / Bashkanov, M / Beck, R / Biroth, M / Borisov, N S / Braghieri, A / Briscoe, W J /
    Cividini, F / Collicott, C / Costanza, S / Denig, A / Dieterle, M / Downie, E J / Drexler, P / Fegan, S / Ferretti-Bondy, M I / Ghosal, D / Gorodnov, I / Gradl, W / Günther, M / Gurevic, G / Heijkenskjöld, L / Hornidge, D / Huber, G M / Jermann, N / Kaeser, A / Korolija, M / Kashevarov, V L / Krusche, B / Kulikov, V V / Lazarev, A / Lutterer, S / MacGregor, I J D / Manley, D M / Martel, P P / Martemianov, M A / Meier, C / Miskimen, R / Mocanu, M / Mornacchi, E / Neganov, A / Oberle, M / Ostrick, M / Otte, P / Paudyal, D / Pedroni, P / Powell, A / Prakhov, S N / Reicherz, G / Ron, G / Rostomyan, T / Sfienti, C / Sokhoyan, V / Spieker, K / Steffen, O / Strub, Th / 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 / Witthauer, L / Wolfes, M / Zachariou, N

    The European physical journal. A, Hadrons and nuclei

    2021  Volume 57, Issue 6, Page(s) 205

    Abstract: ... The ... ...

    Abstract The quasifree
    Language English
    Publishing date 2021-06-26
    Publishing country France
    Document type Journal Article
    ZDB-ID 1459066-9
    ISSN 1434-601X ; 1434-6001
    ISSN (online) 1434-601X
    ISSN 1434-6001
    DOI 10.1140/epja/s10050-021-00521-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. 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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  6. Article: Nauka i naš društveni razvitak

    Supek, Ivan

    Ekonomska znanost kao proizvodna snaga društva : zbornik referata podnesenih na naučnom skupu u povodu proslave 50-godišnijice osnutka Fakulteta Ekonomskih Nauka Sveučilišta u Zagrebu 1920-1970 održanom dne 8. i 9.4.1971 , p. 3-7

    1971  , Page(s) 3–7

    Author's details Ivan Supek
    Publishing place Zagreb
    Document type Article
    Note Die Wissenschaft und die gesellschaftliche Entwicklung in Jugoslawien
    Database ECONomics Information System

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  7. Article ; Online: Single π0 production off neutrons bound in deuteron with linearly polarized photons

    Mullen, C. / Gardner, S. / Glazier, D.I. / Kay, S.J.D. / Livingston, K. / Strakovsky, I.I. / Workman, R.L. / Abt, S. / Achenbach, P. / Afzal, F. / Ahmed, Z. / Akondi, C.S. / Annand, J.R.M. / Bashkanov, M. / Beck, R. / Biroth, M. / Borisov, N.S. / Braghieri, A. / Briscoe, W.J. /
    Cividini, Federico / Collicott, C. / Costanza, S. / Denig, A. / Dieterle, M. / Downie, E.J. / Drexler, P. / Fegan, S. / Ferretti-Bondy, M.I. / Ghosal, D. / Gorodnov, I. / Gradl, W. / Günther, M. / Gurevic, G. / Heijkenskjöld, L. / Hornidge, D. / Huber, G.M. / Jermann, N. / Kaeser, A. / Korolija, M. / Kashevarov, V.L. / Krusche, B. / Kulikov, V.V. / Lazarev, A. / Lutterer, S. / MacGregor, I.J.D. / Manley, D.M. / Martel, P.P. / Martemianov, M.A. / Meier, C. / Miskimen, R. / Mocanu, M. / Mornacchi, E. / Neganov, A. / Oberle, M. / Ostrick, M. / Otte, P. / Paudyal, D. / Pedroni, P. / Powell, A. / Prakhov, S.N. / Reicherz, G. / Ron, G. / Rostomyan, T. / Sfienti, C. / Sokhoyan, V. / Spieker, K. / Steffen, O. / 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. / Witthauer, L. / Wolfes, M. / Zachariou, N.

    2021  

    Abstract: The quasifree γ→d→π0n(p) photon beam asymmetry, Σ, has been measured at photon energies, Eγ, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI ... ...

    Abstract The quasifree γ→d→π0n(p) photon beam asymmetry, Σ, has been measured at photon energies, Eγ, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI electron beam facility with the Crystal Ball and TAPS calorimeters covering pion center-of-mass angles from 49∘ to 148∘. In this kinematic region, polarization observables are sensitive to contributions from the Δ(1232) and N(1440) resonances. The extracted values of Σ have been compared to predictions based on partial-wave analyses (PWAs) of the existing pion photoproduction database. Our comparison includes the SAID, MAID and Bonn–Gatchina analyses; while a revised SAID fit, including the new Σ measurements, has also been performed. In addition, isospin symmetry is examined as a way to predict π0n photoproduction observables, based on fits to published data in the channels π0p, π+n and π-p.

    57

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    Keywords pi0: photoproduction ; photon: energy ; photon: beam ; isospin: symmetry ; beam: asymmetry ; electron: beam ; Crystal Ball ; polarization ; partial wave ; Mainz Linac ; Delta(1232) ; N(1440) ; calorimeter ; kinematics ; deuteron ; DDC::500 Naturwissenschaften und Mathematik
    Subject code 535
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Book: Nauka i mir

    Supek, Ivan

    (Predavanje održana u Jugoslavenskoj Akademiji Znanosti i Umjetnosti ; 21)

    1962  

    Series title Predavanje održana u Jugoslavenskoj Akademiji Znanosti i Umjetnosti ; 21
    Keywords Wissenschaft
    Language Croatian
    Size 23 S. 8"
    Document type Book
    Note [Wissenschaft u. Frieden]
    Database ECONomics Information System

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  9. Article ; Online: Study of η and η' Photoproduction at MAMI.

    Kashevarov, V L / Ott, P / Prakhov, S / Adlarson, P / Afzal, F / Ahmed, Z / Akondi, C S / Annand, J R M / Arends, H J / Beck, R / Braghieri, A / Briscoe, W J / Cividini, F / Codling, R / Collicott, C / Costanza, S / Denig, A / Downie, E J / Dieterle, M /
    Ferretti Bondy, M I / Fil'kov, L V / Fix, A / Gardner, S / Garni, S / Glazier, D I / Glowa, D / Gradl, W / Gurevich, G / Hamilton, D J / Hornidge, D / Howdle, D / Huber, G M / Käser, A / Kay, S / Keshelashvili, I / Kondratiev, R / Korolija, M / Krusche, B / Linturi, J / Lisin, V / Livingston, K / MacGregor, I J D / MacRae, R / Mancell, J / Manley, D M / Martel, P P / McGeorge, J C / McNicol, E / Middleton, D G / Miskimen, R / Mornacchi, E / Mullen, C / Mushkarenkov, A / Neiser, A / Oberle, M / Ostrick, M / Otte, P B / Oussena, B / Paudyal, D / Pedroni, P / Polyanski, V V / Rajabi, A / Reicherz, G / Robinson, J / Rosner, G / Rostomyan, T / Sarty, A / Schott, D M / Schumann, S / Sfienti, C / Sokhoyan, V / Spieker, K / Steffen, O / Strandberg, B / Strakovsky, I I / Strub, Th / Supek, I / Taragin, M F / Thiel, A / Thiel, M / Tiator, L / Thomas, A / Unverzagt, M / Wagner, S / Watts, D P / Werthmüller, D / Wettig, J / Witthauer, L / Wolfes, M / Workman, R L / Zana, L

    Physical review letters

    2017  Volume 118, Issue 21, Page(s) 212001

    Abstract: The reactions γp→ηp and γp→η^{'}p are measured from their thresholds up to the center-of-mass energy W=1.96  GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections are obtained with unprecedented statistical ... ...

    Abstract The reactions γp→ηp and γp→η^{'}p are measured from their thresholds up to the center-of-mass energy W=1.96  GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections are obtained with unprecedented statistical accuracy, providing fine energy binning and full production-angle coverage. A strong cusp is observed in the total cross section for η photoproduction at the energies in the vicinity of the η^{'} threshold, W=1896  MeV (E_{γ}=1447  MeV). Within the framework of a revised ηMAID isobar model, the cusp, in connection with a steep rise of the η^{'} total cross section from its threshold, can only be explained by a strong coupling of the poorly known N(1895)1/2^{-} state to both ηp and η^{'}p. Including the new high-accuracy results in the ηMAID fit to available η and η^{'} photoproduction data allows the determination of the N(1895)1/2^{-} properties.
    Language English
    Publishing date 2017-05-26
    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.118.212001
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  10. Article: New precise measurement of the pion weak form factors in pi+-->e+ nugamma decay.

    Bychkov, M / Pocanić, D / Vandevender, B A / Baranov, V A / Bertl, W / Bystritsky, Yu M / Frlez, E / Kalinnikov, V A / Khomutov, N V / Korenchenko, A S / Korenchenko, S M / Korolija, M / Kozlowski, T / Kravchuk, N P / Kuchinsky, N A / Li, W / Mekterović, D / Mzhavia, D / Ritt, S /
    Robmann, P / Rondon-Aramayo, O A / Rozhdestvensky, A M / Sakhelashvili, T / Scheu, S / Straumann, U / Supek, I / Tsamalaidze, Z / van der Schaaf, A / Velicheva, E P / Volnykh, V P / Wang, Y / Wirtz, H-P

    Physical review letters

    2009  Volume 103, Issue 5, Page(s) 51802

    Abstract: We have measured the pi+-->e+ nugamma branching ratio over a wide region of phase space, based on a total of 65 460 events acquired using the PIBETA detector. Minimum-chi2 fits to the measured (E(e+), E(gamma) energy distributions result in the weak form ...

    Abstract We have measured the pi+-->e+ nugamma branching ratio over a wide region of phase space, based on a total of 65 460 events acquired using the PIBETA detector. Minimum-chi2 fits to the measured (E(e+), E(gamma) energy distributions result in the weak form factor value of F(A)=0.0119(1) with a fixed value of F(V)=0.0259. An unconstrained fit yields F(V)=0.0258(17) and F(A)=0.0117(17). In addition, we have measured a=0.10(6) for the dependence of F(V) on q2, the e+ nu pair invariant mass squared, parametrized as F(V)(q2)=F(V)(0)(1+aq(2)). The branching ratio for the kinematic region E(gamma)>10 MeV and theta(e(+)gamma)>40 degrees is measured to be B(expt)=73.86(54)x10(-8). Earlier deviations we reported in the high-E(gamma)-low-E(e+) kinematic region are resolved without a tensor term. We also derive new values for the pion polarizability alpha(E)=2.78(10)x10(-4) fm3 and neutral pion lifetime tau(pi0)=(8.5+/-1.1)x10(-17) s.
    Language English
    Publishing date 2009-07-31
    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.103.051802
    Database MEDical Literature Analysis and Retrieval System OnLINE

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