Coherent photoproduction of π0- and η-mesons off 7Li

Y. Maghrbi; B. Krusche; J. Ahrens; J. R. M. Annand; H. J. Arends; R. Beck; V. Bekrenev; B. Boillat; A. Braghieri; D. Branford; W. J. Briscoe; J. Brudvik; S. Cherepnya; R. F. B. Codling; E. J. Downie; P. Drexler; L. V. Fil’kov; A. Fix; D. I. Glazier; R. Gregor; E. Heid; D. Hornidge; I. Jaegle; O. Jahn; V. L. Kashevarov; I. Keshelashvili; A. Knezevic; R. Kondratiev; M. Korolija; D. Krambrich; M. Lang; V. Lisin; K. Livingston; S. Lugert; I. J. D. MacGregor; D. M. Manley; M. Martinez; J. C. McGeorge; D. Mekterovic; V. Metag; B. M. K. Nefkens; A. Nikolaev; R. Novotny; M. Ostrick; P. Pedroni; F. Pheron; A. Polonski; S. Prakhov; J. W. Price; G. Rosner; M. Rost; T. Rostomyan; S. Schadmand; S. Schumann; D. Sober; A. Starostin; I. Supek; C. M. Tarbert; A. Thomas; M. Unverzagt; D. P. Watts; D. Werthmüller; F. Zehr

doi:10.1140/epja/i2013-13038-3

Coherent photoproduction of π0- and η-mesons off 7Li

Y. Maghrbi, B. Krusche, J. Ahrens, J. R. M. Annand, H. J. Arends, R. Beck, V. Bekrenev, B. Boillat, A. Braghieri, D. Branford, W. J. Briscoe, J. Brudvik, S. Cherepnya, R. F. B. Codling, E. J. Downie, P. Drexler, L. V. Fil’kov, A. Fix, D. I. Glazier, R. GregorE. Heid, D. Hornidge, I. Jaegle, O. Jahn, V. L. Kashevarov, I. Keshelashvili, A. Knezevic, R. Kondratiev, M. Korolija, D. Krambrich, M. Lang, V. Lisin, K. Livingston, S. Lugert, I. J. D. MacGregor, D. M. Manley, M. Martinez, J. C. McGeorge, D. Mekterovic, V. Metag, B. M. K. Nefkens, A. Nikolaev, R. Novotny, M. Ostrick, P. Pedroni, F. Pheron, A. Polonski, S. Prakhov, J. W. Price, G. Rosner, M. Rost, T. Rostomyan, S. Schadmand, S. Schumann, D. Sober, A. Starostin, I. Supek, C. M. Tarbert, A. Thomas, M. Unverzagt, D. P. Watts, D. Werthmüller, F. Zehr

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Coherent photoproduction of π0-mesons from threshold (Eth≈ 136 MeV) throughout the Δ-resonance region and of η-mesons close to the production threshold (Eth≈ 570 MeV for η has been measured for 7Li nuclei. The experiment was performed using the tagged-photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4π solid-angle electromagnetic calorimeter. The reactions were identified by a combined invariant-mass and missing-energy analysis. A comparison of the pion data to plane-wave impulse modelling tests the nuclear mass form factor. So far coherent η production had been only identified for the lightest nuclear systems (2H and 3He . For 3He a large enhancement of the cross section above plane-wave approximations had been reported, indicating the formation of a quasi-bound state. The present Li data for η production agree with a plane-wave approximation. Contrary to 3He , neither a threshold enhancement of the total cross section nor a deviation of the angular distributions from the expected form factor dependence were observed.

Original language	English
Number of pages	14
Journal	European Physical Journal A : Hadrons and Nuclei
Volume	49
Issue number	3
DOIs	https://doi.org/10.1140/epja/i2013-13038-3
Publication status	Published - 21 Mar 2013

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This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

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10.1140/epja/i2013-13038-3

1303.2254
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Cite this

Maghrbi, Y., Krusche, B., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Downie, E. J., Drexler, P., Fil’kov, L. V., Fix, A., Glazier, D. I., ... Zehr, F. (2013). Coherent photoproduction of π0- and η-mesons off 7Li. European Physical Journal A : Hadrons and Nuclei, 49(3). https://doi.org/10.1140/epja/i2013-13038-3

@article{2e5578e5dd264348b37737506c9db772,

title = "Coherent photoproduction of π0- and η-mesons off 7Li",

abstract = "Coherent photoproduction of π0-mesons from threshold (Eth≈ 136 MeV) throughout the Δ-resonance region and of η-mesons close to the production threshold (Eth≈ 570 MeV for η has been measured for 7Li nuclei. The experiment was performed using the tagged-photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4π solid-angle electromagnetic calorimeter. The reactions were identified by a combined invariant-mass and missing-energy analysis. A comparison of the pion data to plane-wave impulse modelling tests the nuclear mass form factor. So far coherent η production had been only identified for the lightest nuclear systems (2H and 3He . For 3He a large enhancement of the cross section above plane-wave approximations had been reported, indicating the formation of a quasi-bound state. The present Li data for η production agree with a plane-wave approximation. Contrary to 3He , neither a threshold enhancement of the total cross section nor a deviation of the angular distributions from the expected form factor dependence were observed.",

author = "Y. Maghrbi and B. Krusche and J. Ahrens and Annand, {J. R. M.} and Arends, {H. J.} and R. Beck and V. Bekrenev and B. Boillat and A. Braghieri and D. Branford and Briscoe, {W. J.} and J. Brudvik and S. Cherepnya and Codling, {R. F. B.} and Downie, {E. J.} and P. Drexler and Fil{\textquoteright}kov, {L. V.} and A. Fix and Glazier, {D. I.} and R. Gregor and E. Heid and D. Hornidge and I. Jaegle and O. Jahn and Kashevarov, {V. L.} and I. Keshelashvili and A. Knezevic and R. Kondratiev and M. Korolija and D. Krambrich and M. Lang and V. Lisin and K. Livingston and S. Lugert and MacGregor, {I. J. D.} and Manley, {D. M.} and M. Martinez and McGeorge, {J. C.} and D. Mekterovic and V. Metag and Nefkens, {B. M. K.} and A. Nikolaev and R. Novotny and M. Ostrick and P. Pedroni and F. Pheron and A. Polonski and S. Prakhov and Price, {J. W.} and G. Rosner and M. Rost and T. Rostomyan and S. Schadmand and S. Schumann and D. Sober and A. Starostin and I. Supek and Tarbert, {C. M.} and A. Thomas and M. Unverzagt and Watts, {D. P.} and D. Werthm{\"u}ller and F. Zehr",

note = "This is an author-produced version of the published paper. Uploaded in accordance with the publisher{\textquoteright}s self-archiving policy. Further copying may not be permitted; contact the publisher for details",

year = "2013",

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doi = "10.1140/epja/i2013-13038-3",

language = "English",

volume = "49",

journal = "European Physical Journal A : Hadrons and Nuclei",

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Maghrbi, Y, Krusche, B, Ahrens, J, Annand, JRM, Arends, HJ, Beck, R, Bekrenev, V, Boillat, B, Braghieri, A, Branford, D, Briscoe, WJ, Brudvik, J, Cherepnya, S, Codling, RFB, Downie, EJ, Drexler, P, Fil’kov, LV, Fix, A, Glazier, DI, Gregor, R, Heid, E, Hornidge, D, Jaegle, I, Jahn, O, Kashevarov, VL, Keshelashvili, I, Knezevic, A, Kondratiev, R, Korolija, M, Krambrich, D, Lang, M, Lisin, V, Livingston, K, Lugert, S, MacGregor, IJD, Manley, DM, Martinez, M, McGeorge, JC, Mekterovic, D, Metag, V, Nefkens, BMK, Nikolaev, A, Novotny, R, Ostrick, M, Pedroni, P, Pheron, F, Polonski, A, Prakhov, S, Price, JW, Rosner, G, Rost, M, Rostomyan, T, Schadmand, S, Schumann, S, Sober, D, Starostin, A, Supek, I, Tarbert, CM, Thomas, A, Unverzagt, M, Watts, DP , Werthmüller, D & Zehr, F 2013, 'Coherent photoproduction of π0- and η-mesons off 7Li', European Physical Journal A : Hadrons and Nuclei, vol. 49, no. 3. https://doi.org/10.1140/epja/i2013-13038-3

TY - JOUR

T1 - Coherent photoproduction of π0- and η-mesons off 7Li

AU - Maghrbi, Y.

AU - Krusche, B.

AU - Ahrens, J.

AU - Annand, J. R. M.

AU - Arends, H. J.

AU - Beck, R.

AU - Bekrenev, V.

AU - Boillat, B.

AU - Braghieri, A.

AU - Branford, D.

AU - Briscoe, W. J.

AU - Brudvik, J.

AU - Cherepnya, S.

AU - Codling, R. F. B.

AU - Downie, E. J.

AU - Drexler, P.

AU - Fil’kov, L. V.

AU - Fix, A.

AU - Glazier, D. I.

AU - Gregor, R.

AU - Heid, E.

AU - Hornidge, D.

AU - Jaegle, I.

AU - Jahn, O.

AU - Kashevarov, V. L.

AU - Keshelashvili, I.

AU - Knezevic, A.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Krambrich, D.

AU - Lang, M.

AU - Lisin, V.

AU - Livingston, K.

AU - Lugert, S.

AU - MacGregor, I. J. D.

AU - Manley, D. M.

AU - Martinez, M.

AU - McGeorge, J. C.

AU - Mekterovic, D.

AU - Metag, V.

AU - Nefkens, B. M. K.

AU - Nikolaev, A.

AU - Novotny, R.

AU - Ostrick, M.

AU - Pedroni, P.

AU - Pheron, F.

AU - Polonski, A.

AU - Prakhov, S.

AU - Price, J. W.

AU - Rosner, G.

AU - Rost, M.

AU - Rostomyan, T.

AU - Schadmand, S.

AU - Schumann, S.

AU - Sober, D.

AU - Starostin, A.

AU - Supek, I.

AU - Tarbert, C. M.

AU - Thomas, A.

AU - Unverzagt, M.

AU - Watts, D. P.

AU - Werthmüller, D.

AU - Zehr, F.

N1 - This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

PY - 2013/3/21

Y1 - 2013/3/21

N2 - Coherent photoproduction of π0-mesons from threshold (Eth≈ 136 MeV) throughout the Δ-resonance region and of η-mesons close to the production threshold (Eth≈ 570 MeV for η has been measured for 7Li nuclei. The experiment was performed using the tagged-photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4π solid-angle electromagnetic calorimeter. The reactions were identified by a combined invariant-mass and missing-energy analysis. A comparison of the pion data to plane-wave impulse modelling tests the nuclear mass form factor. So far coherent η production had been only identified for the lightest nuclear systems (2H and 3He . For 3He a large enhancement of the cross section above plane-wave approximations had been reported, indicating the formation of a quasi-bound state. The present Li data for η production agree with a plane-wave approximation. Contrary to 3He , neither a threshold enhancement of the total cross section nor a deviation of the angular distributions from the expected form factor dependence were observed.

AB - Coherent photoproduction of π0-mesons from threshold (Eth≈ 136 MeV) throughout the Δ-resonance region and of η-mesons close to the production threshold (Eth≈ 570 MeV for η has been measured for 7Li nuclei. The experiment was performed using the tagged-photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4π solid-angle electromagnetic calorimeter. The reactions were identified by a combined invariant-mass and missing-energy analysis. A comparison of the pion data to plane-wave impulse modelling tests the nuclear mass form factor. So far coherent η production had been only identified for the lightest nuclear systems (2H and 3He . For 3He a large enhancement of the cross section above plane-wave approximations had been reported, indicating the formation of a quasi-bound state. The present Li data for η production agree with a plane-wave approximation. Contrary to 3He , neither a threshold enhancement of the total cross section nor a deviation of the angular distributions from the expected form factor dependence were observed.

U2 - 10.1140/epja/i2013-13038-3

DO - 10.1140/epja/i2013-13038-3

M3 - Article

SN - 1434-601X

VL - 49

JO - European Physical Journal A : Hadrons and Nuclei

JF - European Physical Journal A : Hadrons and Nuclei

IS - 3

ER -