Coherent photoproduction of eta-mesons off He-3 - search for eta-mesic nuclei

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

doi:10.1016/j.physletb.2012.01.075

Coherent photoproduction of eta-mesons off He-3 - search for eta-mesic nuclei

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

School of Physics and Astronomy

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Abstract / Description of output

Coherent photoproduction of eta-mesons off He-3, i.e. the reaction gamma He-3 -> eta He-3, has been investigated in the near-threshold region. The experiment was performed at the Glasgow tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball - TAPS detector. Angular distributions and the total cross section were measured using the eta -> gamma gamma and eta -> 3 pi(0) -> 6 gamma decay channels. The observed extremely sharp rise of the cross section at threshold and the behavior of the angular distributions are evidence for a strong eta He-3 final state interaction, pointing to the existence of a resonant state. The search for further evidence of this state in the excitation function of pi(0)-proton back-to-back emission in the gamma He-3 -> pi(0)pX reaction revealed a very complicated structure of the background and could not support previous conclusions. (C) 2012 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	21-27
Number of pages	7
Journal	Physics Letters B
Volume	709
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physletb.2012.01.075
Publication status	Published - 13 Mar 2012

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10.1016/j.physletb.2012.01.075

Illuminating strongly interacting matter
Watts, D.
STFC
1/06/09 → 31/12/13
Project: Research

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Pheron, F., Ahrens, J., Annand, J. R. M., Arends, H. J., Bantawa, K., Bartolome, P. A., Beck, R., Bekrenev, V., Berghaeuser, H., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Demissie, B., Dieterle, M., Downie, E. J., Drexler, P., ... Zehr, F. (2012). Coherent photoproduction of eta-mesons off He-3 - search for eta-mesic nuclei. Physics Letters B, 709(1-2), 21-27. https://doi.org/10.1016/j.physletb.2012.01.075

@article{7a816f6fbce64c9d87208dd0c1b4a124,

title = "Coherent photoproduction of eta-mesons off He-3 - search for eta-mesic nuclei",

abstract = "Coherent photoproduction of eta-mesons off He-3, i.e. the reaction gamma He-3 -> eta He-3, has been investigated in the near-threshold region. The experiment was performed at the Glasgow tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball - TAPS detector. Angular distributions and the total cross section were measured using the eta -> gamma gamma and eta -> 3 pi(0) -> 6 gamma decay channels. The observed extremely sharp rise of the cross section at threshold and the behavior of the angular distributions are evidence for a strong eta He-3 final state interaction, pointing to the existence of a resonant state. The search for further evidence of this state in the excitation function of pi(0)-proton back-to-back emission in the gamma He-3 -> pi(0)pX reaction revealed a very complicated structure of the background and could not support previous conclusions. (C) 2012 Elsevier B.V. All rights reserved.",

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

year = "2012",

month = mar,

day = "13",

doi = "10.1016/j.physletb.2012.01.075",

language = "English",

volume = "709",

pages = "21--27",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "1-2",

}

Pheron, F, Ahrens, J, Annand, JRM, Arends, HJ, Bantawa, K, Bartolome, PA, Beck, R, Bekrenev, V, Berghaeuser, H, Boillat, B, Braghieri, A, Branford, D, Briscoe, WJ, Brudvik, J, Cherepnya, S, Demissie, B, Dieterle, M, Downie, EJ, Drexler, P, Glazier, DI, Heid, E, Fil'kov, LV, Hornidge, D, Howdle, D, Jahn, O, Jaegle, I, Jude, TC, Kashevarov, VL, Keshelashvili, I, Kondratiev, R, Korolija, M, Kotulla, M, Kulbardis, A, Kruglov, SP, Krusche, B, Lisin, V, Livingston, K, MacGregor, IJD, Maghrbi, Y, Mancell, J, Manley, DM, Marinides, Z, Martinez, M, McGeorge, JC, McNicoll, E, Mekterovic, D, Metag, V, Micanovic, S, Middleton, DG, Mushkarenkov, A, Nefkens, BMK, Nikolaev, A, Novotny, R, Oberle, M, Ostrick, M, Oussena, B, Pedroni, P, Polonski, A, Prakhov, SN, Robinson, J, Rosner, G, Rostomyan, T, Schumann, S, Sikora, MH, Sober, DI, Starostin, A, Supek, I, Thiel, M, Thomas, A, Unverzagt, M, Watts, DP, Werthmueller, D, Witthauer, L & Zehr, F 2012, 'Coherent photoproduction of eta-mesons off He-3 - search for eta-mesic nuclei', Physics Letters B, vol. 709, no. 1-2, pp. 21-27. https://doi.org/10.1016/j.physletb.2012.01.075

TY - JOUR

T1 - Coherent photoproduction of eta-mesons off He-3 - search for eta-mesic nuclei

AU - Pheron, F.

AU - Ahrens, J.

AU - Annand, J. R. M.

AU - Arends, H. J.

AU - Bantawa, K.

AU - Bartolome, P. A.

AU - Beck, R.

AU - Bekrenev, V.

AU - Berghaeuser, H.

AU - Boillat, B.

AU - Braghieri, A.

AU - Branford, D.

AU - Briscoe, W. J.

AU - Brudvik, J.

AU - Cherepnya, S.

AU - Demissie, B.

AU - Dieterle, M.

AU - Downie, E. J.

AU - Drexler, P.

AU - Glazier, D. I.

AU - Heid, E.

AU - Fil'kov, L. V.

AU - Hornidge, D.

AU - Howdle, D.

AU - Jahn, O.

AU - Jaegle, I.

AU - Jude, T. C.

AU - Kashevarov, V. L.

AU - Keshelashvili, I.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Kotulla, M.

AU - Kulbardis, A.

AU - Kruglov, S. P.

AU - Krusche, B.

AU - Lisin, V.

AU - Livingston, K.

AU - MacGregor, I. J. D.

AU - Maghrbi, Y.

AU - Mancell, J.

AU - Manley, D. M.

AU - Marinides, Z.

AU - Martinez, M.

AU - McGeorge, J. C.

AU - McNicoll, E.

AU - Mekterovic, D.

AU - Metag, V.

AU - Micanovic, S.

AU - Middleton, D. G.

AU - Mushkarenkov, A.

AU - Nefkens, B. M. K.

AU - Nikolaev, A.

AU - Novotny, R.

AU - Oberle, M.

AU - Ostrick, M.

AU - Oussena, B.

AU - Pedroni, P.

AU - Polonski, A.

AU - Prakhov, S. N.

AU - Robinson, J.

AU - Rosner, G.

AU - Rostomyan, T.

AU - Schumann, S.

AU - Sikora, M. H.

AU - Sober, D. I.

AU - Starostin, A.

AU - Supek, I.

AU - Thiel, M.

AU - Thomas, A.

AU - Unverzagt, M.

AU - Watts, D. P.

AU - Werthmueller, D.

AU - Witthauer, L.

AU - Zehr, F.

PY - 2012/3/13

Y1 - 2012/3/13

N2 - Coherent photoproduction of eta-mesons off He-3, i.e. the reaction gamma He-3 -> eta He-3, has been investigated in the near-threshold region. The experiment was performed at the Glasgow tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball - TAPS detector. Angular distributions and the total cross section were measured using the eta -> gamma gamma and eta -> 3 pi(0) -> 6 gamma decay channels. The observed extremely sharp rise of the cross section at threshold and the behavior of the angular distributions are evidence for a strong eta He-3 final state interaction, pointing to the existence of a resonant state. The search for further evidence of this state in the excitation function of pi(0)-proton back-to-back emission in the gamma He-3 -> pi(0)pX reaction revealed a very complicated structure of the background and could not support previous conclusions. (C) 2012 Elsevier B.V. All rights reserved.

AB - Coherent photoproduction of eta-mesons off He-3, i.e. the reaction gamma He-3 -> eta He-3, has been investigated in the near-threshold region. The experiment was performed at the Glasgow tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball - TAPS detector. Angular distributions and the total cross section were measured using the eta -> gamma gamma and eta -> 3 pi(0) -> 6 gamma decay channels. The observed extremely sharp rise of the cross section at threshold and the behavior of the angular distributions are evidence for a strong eta He-3 final state interaction, pointing to the existence of a resonant state. The search for further evidence of this state in the excitation function of pi(0)-proton back-to-back emission in the gamma He-3 -> pi(0)pX reaction revealed a very complicated structure of the background and could not support previous conclusions. (C) 2012 Elsevier B.V. All rights reserved.

U2 - 10.1016/j.physletb.2012.01.075

DO - 10.1016/j.physletb.2012.01.075

M3 - Article

SN - 0370-2693

VL - 709

SP - 21

EP - 27

JO - Physics Letters B

JF - Physics Letters B

IS - 1-2

ER -

Coherent photoproduction of eta-mesons off He-3 - search for eta-mesic nuclei

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