Quasi-free photoproduction of η-mesons off 3He nuclei

L. Witthauer, D. Werthmüller, I. Keshelashvili, P. Aguar-Bartolomé, J. Ahrens, J. R.M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bekrenev, A. Braghieri, D. Branford, W. J. Briscoe, J. Brudvik, S. Cherepnya, B. Demissie, M. Dieterle, E. J. Downie, P. Drexler, L. V. Fil'kov & 53 others A. Fix, D. I. Glazier, D. Hamilton, E. Heid, D. Hornidge, D. Howdle, G. M. Huber, I. Jaegle, O. Jahn, T. C. Jude, A. Käser, V. L. Kashevarov, R. Kondratiev, M. Korolija, S. P. Kruglov, B. Krusche, A. Kulbardis, V. Lisin, K. Livingston, I. J.D. Macgregor, Y. Maghrbi, J. Mancell, D. M. Manley, Z. Marinides, M. Martinez, J. C. McGeorge, E. McNicoll, V. Metag, D. G. Middleton, A. Mushkarenkov, B. M.K. Nefkens, A. Nikolaev, R. Novotny, M. Oberle, M. Ostrick, B. Oussena, P. Pedroni, F. Pheron, A. Polonski, S. Prakhov, J. Robinson, G. Rosner, M. Rost, T. Rostomyan, S. Schumann, M. H. Sikora, D. Sobe, A. Starostin, I. Supek, M. Thiel, A. Thomas, M. Unverzag, D. P. Watts

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Quasi-free photoproduction of η-mesons has been measured off nucleons bound in 3He nuclei for incident photon energies from the threshold region up to 1.4 GeV. The experiment was performed at the tagged photon facility of the Mainz MAMI accelerator with an almost 4π covering electromagnetic calorimeter, combining the TAPS and Crystal Ball detectors. The η-mesons were detected in coincidence with the recoil nucleons. This allowed a comparison of the production cross section off quasi-free protons and quasi-free neutrons and a full kinematic reconstruction of the final state, eliminating effects from nuclear Fermi motion. In the S11(1535) resonance peak, the data agree with the neutron/proton cross section ratio extracted from measurements with deuteron targets. More importantly, the prominent structure observed in photoproduction off quasi-free neutrons bound in the deuteron is also clearly observed. Its parameters (width, strength) are consistent with the expectations from the deuteron results. On an absolute scale the cross sections for both quasi-free protons and neutrons are suppressed with respect to the deuteron target pointing to significant nuclear final-state interaction effects.

Original languageEnglish
Article number154
Pages (from-to)1-18
Number of pages18
JournalEuropean Physical Journal A
Volume49
Issue number12
DOIs
Publication statusPublished - 1 Jan 2013

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photoproduction
deuterons
mesons
neutrons
nuclei
nucleons
protons
cross sections
photons
calorimeters
balls
coverings
accelerators
kinematics
electromagnetism
thresholds
detectors
crystals
interactions
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Witthauer, L., Werthmüller, D., Keshelashvili, I., Aguar-Bartolomé, P., Ahrens, J., Annand, J. R. M., ... Watts, D. P. (2013). Quasi-free photoproduction of η-mesons off 3He nuclei. European Physical Journal A, 49(12), 1-18. [154]. https://doi.org/10.1140/epja/i2013-13154-0

Quasi-free photoproduction of η-mesons off 3He nuclei. / Witthauer, L.; Werthmüller, D.; Keshelashvili, I.; Aguar-Bartolomé, P.; Ahrens, J.; Annand, J. R.M.; Arends, H. J.; Bantawa, K.; Beck, R.; Bekrenev, V.; Braghieri, A.; Branford, D.; Briscoe, W. J.; Brudvik, J.; Cherepnya, S.; Demissie, B.; Dieterle, M.; Downie, E. J.; Drexler, P.; Fil'kov, L. V.; Fix, A.; Glazier, D. I.; Hamilton, D.; Heid, E.; Hornidge, D.; Howdle, D.; Huber, G. M.; Jaegle, I.; Jahn, O.; Jude, T. C.; Käser, A.; Kashevarov, V. L.; Kondratiev, R.; Korolija, M.; Kruglov, S. P.; Krusche, B.; Kulbardis, A.; Lisin, V.; Livingston, K.; Macgregor, I. J.D.; Maghrbi, Y.; Mancell, J.; Manley, D. M.; Marinides, Z.; Martinez, M.; McGeorge, J. C.; McNicoll, E.; Metag, V.; Middleton, D. G.; Mushkarenkov, A.; Nefkens, B. M.K.; Nikolaev, A.; Novotny, R.; Oberle, M.; Ostrick, M.; Oussena, B.; Pedroni, P.; Pheron, F.; Polonski, A.; Prakhov, S.; Robinson, J.; Rosner, G.; Rost, M.; Rostomyan, T.; Schumann, S.; Sikora, M. H.; Sobe, D.; Starostin, A.; Supek, I.; Thiel, M.; Thomas, A.; Unverzag, M.; Watts, D. P.

In: European Physical Journal A, Vol. 49, No. 12, 154, 01.01.2013, p. 1-18.

Research output: Contribution to journalArticle

Witthauer, L, Werthmüller, D, Keshelashvili, I, Aguar-Bartolomé, P, Ahrens, J, Annand, JRM, Arends, HJ, Bantawa, K, Beck, R, Bekrenev, V, Braghieri, A, Branford, D, Briscoe, WJ, Brudvik, J, Cherepnya, S, Demissie, B, Dieterle, M, Downie, EJ, Drexler, P, Fil'kov, LV, Fix, A, Glazier, DI, Hamilton, D, Heid, E, Hornidge, D, Howdle, D, Huber, GM, Jaegle, I, Jahn, O, Jude, TC, Käser, A, Kashevarov, VL, Kondratiev, R, Korolija, M, Kruglov, SP, Krusche, B, Kulbardis, A, Lisin, V, Livingston, K, Macgregor, IJD, Maghrbi, Y, Mancell, J, Manley, DM, Marinides, Z, Martinez, M, McGeorge, JC, McNicoll, E, Metag, V, Middleton, DG, Mushkarenkov, A, Nefkens, BMK, Nikolaev, A, Novotny, R, Oberle, M, Ostrick, M, Oussena, B, Pedroni, P, Pheron, F, Polonski, A, Prakhov, S, Robinson, J, Rosner, G, Rost, M, Rostomyan, T, Schumann, S, Sikora, MH, Sobe, D, Starostin, A, Supek, I, Thiel, M, Thomas, A, Unverzag, M & Watts, DP 2013, 'Quasi-free photoproduction of η-mesons off 3He nuclei', European Physical Journal A, vol. 49, no. 12, 154, pp. 1-18. https://doi.org/10.1140/epja/i2013-13154-0
Witthauer L, Werthmüller D, Keshelashvili I, Aguar-Bartolomé P, Ahrens J, Annand JRM et al. Quasi-free photoproduction of η-mesons off 3He nuclei. European Physical Journal A. 2013 Jan 1;49(12):1-18. 154. https://doi.org/10.1140/epja/i2013-13154-0
Witthauer, L. ; Werthmüller, D. ; Keshelashvili, I. ; Aguar-Bartolomé, P. ; Ahrens, J. ; Annand, J. R.M. ; Arends, H. J. ; Bantawa, K. ; Beck, R. ; Bekrenev, V. ; Braghieri, A. ; Branford, D. ; Briscoe, W. J. ; Brudvik, J. ; Cherepnya, S. ; Demissie, B. ; Dieterle, M. ; Downie, E. J. ; Drexler, P. ; Fil'kov, L. V. ; Fix, A. ; Glazier, D. I. ; Hamilton, D. ; Heid, E. ; Hornidge, D. ; Howdle, D. ; Huber, G. M. ; Jaegle, I. ; Jahn, O. ; Jude, T. C. ; Käser, A. ; Kashevarov, V. L. ; Kondratiev, R. ; Korolija, M. ; Kruglov, S. P. ; Krusche, B. ; Kulbardis, A. ; Lisin, V. ; Livingston, K. ; Macgregor, I. J.D. ; Maghrbi, Y. ; Mancell, J. ; Manley, D. M. ; Marinides, Z. ; Martinez, M. ; McGeorge, J. C. ; McNicoll, E. ; Metag, V. ; Middleton, D. G. ; Mushkarenkov, A. ; Nefkens, B. M.K. ; Nikolaev, A. ; Novotny, R. ; Oberle, M. ; Ostrick, M. ; Oussena, B. ; Pedroni, P. ; Pheron, F. ; Polonski, A. ; Prakhov, S. ; Robinson, J. ; Rosner, G. ; Rost, M. ; Rostomyan, T. ; Schumann, S. ; Sikora, M. H. ; Sobe, D. ; Starostin, A. ; Supek, I. ; Thiel, M. ; Thomas, A. ; Unverzag, M. ; Watts, D. P. / Quasi-free photoproduction of η-mesons off 3He nuclei. In: European Physical Journal A. 2013 ; Vol. 49, No. 12. pp. 1-18.
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abstract = "Quasi-free photoproduction of η-mesons has been measured off nucleons bound in 3He nuclei for incident photon energies from the threshold region up to 1.4 GeV. The experiment was performed at the tagged photon facility of the Mainz MAMI accelerator with an almost 4π covering electromagnetic calorimeter, combining the TAPS and Crystal Ball detectors. The η-mesons were detected in coincidence with the recoil nucleons. This allowed a comparison of the production cross section off quasi-free protons and quasi-free neutrons and a full kinematic reconstruction of the final state, eliminating effects from nuclear Fermi motion. In the S11(1535) resonance peak, the data agree with the neutron/proton cross section ratio extracted from measurements with deuteron targets. More importantly, the prominent structure observed in photoproduction off quasi-free neutrons bound in the deuteron is also clearly observed. Its parameters (width, strength) are consistent with the expectations from the deuteron results. On an absolute scale the cross sections for both quasi-free protons and neutrons are suppressed with respect to the deuteron target pointing to significant nuclear final-state interaction effects.",
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T1 - Quasi-free photoproduction of η-mesons off 3He nuclei

AU - Witthauer, L.

AU - Werthmüller, D.

AU - Keshelashvili, I.

AU - Aguar-Bartolomé, P.

AU - Ahrens, J.

AU - Annand, J. R.M.

AU - Arends, H. J.

AU - Bantawa, K.

AU - Beck, R.

AU - Bekrenev, V.

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 - Fil'kov, L. V.

AU - Fix, A.

AU - Glazier, D. I.

AU - Hamilton, D.

AU - Heid, E.

AU - Hornidge, D.

AU - Howdle, D.

AU - Huber, G. M.

AU - Jaegle, I.

AU - Jahn, O.

AU - Jude, T. C.

AU - Käser, A.

AU - Kashevarov, V. L.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Kruglov, S. P.

AU - Krusche, B.

AU - Kulbardis, A.

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 - Metag, V.

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 - Pheron, F.

AU - Polonski, A.

AU - Prakhov, S.

AU - Robinson, J.

AU - Rosner, G.

AU - Rost, M.

AU - Rostomyan, T.

AU - Schumann, S.

AU - Sikora, M. H.

AU - Sobe, D.

AU - Starostin, A.

AU - Supek, I.

AU - Thiel, M.

AU - Thomas, A.

AU - Unverzag, M.

AU - Watts, D. P.

PY - 2013/1/1

Y1 - 2013/1/1

N2 - Quasi-free photoproduction of η-mesons has been measured off nucleons bound in 3He nuclei for incident photon energies from the threshold region up to 1.4 GeV. The experiment was performed at the tagged photon facility of the Mainz MAMI accelerator with an almost 4π covering electromagnetic calorimeter, combining the TAPS and Crystal Ball detectors. The η-mesons were detected in coincidence with the recoil nucleons. This allowed a comparison of the production cross section off quasi-free protons and quasi-free neutrons and a full kinematic reconstruction of the final state, eliminating effects from nuclear Fermi motion. In the S11(1535) resonance peak, the data agree with the neutron/proton cross section ratio extracted from measurements with deuteron targets. More importantly, the prominent structure observed in photoproduction off quasi-free neutrons bound in the deuteron is also clearly observed. Its parameters (width, strength) are consistent with the expectations from the deuteron results. On an absolute scale the cross sections for both quasi-free protons and neutrons are suppressed with respect to the deuteron target pointing to significant nuclear final-state interaction effects.

AB - Quasi-free photoproduction of η-mesons has been measured off nucleons bound in 3He nuclei for incident photon energies from the threshold region up to 1.4 GeV. The experiment was performed at the tagged photon facility of the Mainz MAMI accelerator with an almost 4π covering electromagnetic calorimeter, combining the TAPS and Crystal Ball detectors. The η-mesons were detected in coincidence with the recoil nucleons. This allowed a comparison of the production cross section off quasi-free protons and quasi-free neutrons and a full kinematic reconstruction of the final state, eliminating effects from nuclear Fermi motion. In the S11(1535) resonance peak, the data agree with the neutron/proton cross section ratio extracted from measurements with deuteron targets. More importantly, the prominent structure observed in photoproduction off quasi-free neutrons bound in the deuteron is also clearly observed. Its parameters (width, strength) are consistent with the expectations from the deuteron results. On an absolute scale the cross sections for both quasi-free protons and neutrons are suppressed with respect to the deuteron target pointing to significant nuclear final-state interaction effects.

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