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A narrow structure in the excitation function of eta-photoproduction off the neutron

by Bantawa, K , Aguar-Bartolome, P , Glazier, D I , Unverzagt, M , Fil'kov, L V , McGeorge, J C , Drexler, P , Ahrens, J , Branford, D , Middleton, D G , Marinides, Z , Sober, D , Kruglov, S P , Nefkens, B M K , Livingston, K , Lisin, V , Supek, I , Bekrenev, V , Annand, J R M , Watts, D P , Jude, T C , Hornidge, D , Maghrbi, Y , Rostomyan, T , Beck, R , Robinson, J , Howdle, D , Oberle, M , Briscoe, W J , McNicoll, E F , Kashevarov, V L , Werthmueller, D , Nikolaev, A , Kondratiev, R , Korolija, M , Pedroni, P , Martinez, M , Oussena, B , Huber, G M , Prakhov, S N , Thiel, M , Kulbardis, A , Metag, V , Fix, A , Keshelashvili, I , Sikora, M H , Heid, E , Manley, D M , Jahn, O , Demissie, B , Pheron, F , Thomas, A , Kaeser, A , Starostin, A , Brudvik, J , Ostrick, M , Jaegle, I , Braghieri, A , MacGregor, I J D , Hamilton, D , Cherepnya, S , Witthauer, L , Downie, E J , Mancell, J , Mushkarenkov, A , Krusche, B , Polonski, A , Dieterle, M , Arends, H J , Novotny, R , Rosner, G , Schumann, S

in Dependence / Eta-mesons / Excitation / Mesons / Nucleons / Photons / Photoproduction / Recoil protons

2013

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A narrow structure in the excitation function of eta-photoproduction off the neutron

in Dependence / Eta-mesons / Excitation / Mesons / Nucleons / Photons / Photoproduction / Recoil protons

2013

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A narrow structure in the excitation function of eta-photoproduction off the neutron

in Dependence / Eta-mesons / Excitation / Mesons / Nucleons / Photons / Photoproduction / Recoil protons

2013

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Paper

A narrow structure in the excitation function of eta-photoproduction off the neutron

Bantawa, K,

Aguar-Bartolome, P,

Glazier, D I,

Unverzagt, M,

Fil'kov, L V,

McGeorge, J C,

Drexler, P,

Ahrens, J,

Branford, D,

Middleton, D G,

Marinides, Z,

Sober, D,

Kruglov, S P,

Nefkens, B M K,

Livingston, K,

Lisin, V,

Supek, I,

Bekrenev, V,

Annand, J R M,

Watts, D P,

Jude, T C,

Hornidge, D,

Maghrbi, Y,

Rostomyan, T,

Beck, R,

Robinson, J,

Howdle, D,

Oberle, M,

Briscoe, W J,

McNicoll, E F,

Kashevarov, V L,

Werthmueller, D,

Nikolaev, A,

Kondratiev, R,

Korolija, M,

Pedroni, P,

Martinez, M,

Oussena, B,

Huber, G M,

Prakhov, S N,

Thiel, M,

Kulbardis, A,

Metag, V,

Fix, A,

Keshelashvili, I,

Sikora, M H,

Heid, E,

Manley, D M,

Jahn, O,

Demissie, B,

Pheron, F,

Thomas, A,

Kaeser, A,

Starostin, A,

Brudvik, J,

Ostrick, M,

Jaegle, I,

Braghieri, A,

MacGregor, I J D,

Hamilton, D,

Cherepnya, S,

Witthauer, L,

Downie, E J,

Mancell, J,

Mushkarenkov, A,

Krusche, B,

Polonski, A,

Dieterle, M,

Arends, H J,

Novotny, R,

Rosner, G,

Schumann, S

2013

Overview

The photoproduction of \\(\\eta\\)-mesons off nucleons bound in \\(^2\\)H and \\(^3\\)He has been measured in coincidence with recoil protons and recoil neutrons for incident photon energies from threshold up to 1.4 GeV. The experiments were performed at the Mainz MAMI accelerator, using the Glasgow tagged photon facility. Decay photons from the \\(\\eta\\rightarrow 2\\gamma\\) and \\(\\eta\\rightarrow 3\\pi^0\\) decays and the recoil nucleons were detected with an almost \\(4\\pi\\) electromagnetic calorimeter combining the Crystal Ball and TAPS detectors. The data from both targets are of excellent statistical quality and show a narrow structure in the excitation function of \\(\\gamma n\\rightarrow n\\eta\\). The results from the two measurements are consistent taking into account the expected effects from nuclear Fermi motion. The best estimates for position and intrinsic width of the structure are \\(W\\) = (1670\\(\\pm\\)5) MeV and \\(\\Gamma\\) =(30\\(\\pm\\)15) MeV. For the first time precise results for the angular dependence of this structure have been extracted.

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Publisher

Cornell University Library, arXiv.org

Subject

/ Mesons

/ Photons