Quasifree photoproduction of mesons off protons and neutrons

D. Werthmüller, L. Witthauer, 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, S. Costanza, B. Demissie, M. Dieterle, E. J. Downie, P. Drexler & 54 others L. V. Fil'Kov, 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. F. McNicoll, V. Metag, D. G. Middleton, A. Mushkarenkov, B. M K Nefkens, A. Nikolaev, R. Novotny, M. Oberle, M. Ostrick, P. B. Otte, B. Oussena, P. Pedroni, F. Pheron, A. Polonski, S. N. Prakhov, J. Robinson, G. Rosner, T. Rostomyan, S. Schumann, M. H. Sikora, D. Sober, A. Starostin, I. Supek, M. Thiel, A. Thomas, M. Unverzagt, D. P. Watts

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Differential and total cross sections for the quasifree reactions p-p and n- n have been determined at the MAMI-C electron accelerator by using a liquid deuterium target. Photons were produced via bremsstrahlung from the 1.5 GeV incident electron beam and energy tagged with the Glasgow photon tagger. Decay photons of the neutral decay modes -2 and -3Ï€0-6 and coincident recoil nucleons were detected in a combined setup of the Crystal Ball and the TAPS calorimeters. The -production cross sections were measured in coincidence with recoil protons, recoil neutrons, and in an inclusive mode without a condition on recoil nucleons, which allowed a check of the internal consistency of the data. The effects from nuclear Fermi motion were removed by a kinematic reconstruction of the final-state invariant mass and possible nuclear effects on the quasifree cross section were investigated by a comparison of free and quasifree-proton data. The results, which represent a significant improvement in statistical quality compared to previous measurements, agree with the known neutron-to-proton cross-section ratio in the peak of the S11(1535) resonance and confirm a peak in the neutron cross section, which is absent for the proton, at a center-of-mass energy W=(1670±5) MeV with an intrinsic width of 30 MeV.

Original languageEnglish
Article number015205
JournalPhysical Review C - Nuclear Physics
Volume90
Issue number1
DOIs
Publication statusPublished - 25 Jul 2014

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photoproduction
mesons
neutrons
protons
cross sections
nucleons
photons
neutron cross sections
recoil protons
electron accelerators
decay
bremsstrahlung
calorimeters
center of mass
balls
deuterium
kinematics
electron beams
electron energy
liquids

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Werthmüller, D., Witthauer, L., Keshelashvili, I., Aguar-Bartolomé, P., Ahrens, J., Annand, J. R. M., ... Watts, D. P. (2014). Quasifree photoproduction of mesons off protons and neutrons. Physical Review C - Nuclear Physics, 90(1), [015205]. https://doi.org/10.1103/PhysRevC.90.015205

Quasifree photoproduction of mesons off protons and neutrons. / Werthmüller, D.; Witthauer, L.; 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.; Costanza, 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. F.; Metag, V.; Middleton, D. G.; Mushkarenkov, A.; Nefkens, B. M K; Nikolaev, A.; Novotny, R.; Oberle, M.; Ostrick, M.; Otte, P. B.; Oussena, B.; Pedroni, P.; Pheron, F.; Polonski, A.; Prakhov, S. N.; Robinson, J.; Rosner, G.; Rostomyan, T.; Schumann, S.; Sikora, M. H.; Sober, D.; Starostin, A.; Supek, I.; Thiel, M.; Thomas, A.; Unverzagt, M.; Watts, D. P.

In: Physical Review C - Nuclear Physics, Vol. 90, No. 1, 015205, 25.07.2014.

Research output: Contribution to journalArticle

Werthmüller, D, Witthauer, L, 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, Costanza, 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, EF, Metag, V, Middleton, DG, Mushkarenkov, A, Nefkens, BMK, Nikolaev, A, Novotny, R, Oberle, M, Ostrick, M, Otte, PB, Oussena, B, Pedroni, P, Pheron, F, Polonski, A, Prakhov, SN, Robinson, J, Rosner, G, Rostomyan, T, Schumann, S, Sikora, MH, Sober, D, Starostin, A, Supek, I, Thiel, M, Thomas, A, Unverzagt, M & Watts, DP 2014, 'Quasifree photoproduction of mesons off protons and neutrons', Physical Review C - Nuclear Physics, vol. 90, no. 1, 015205. https://doi.org/10.1103/PhysRevC.90.015205
Werthmüller D, Witthauer L, Keshelashvili I, Aguar-Bartolomé P, Ahrens J, Annand JRM et al. Quasifree photoproduction of mesons off protons and neutrons. Physical Review C - Nuclear Physics. 2014 Jul 25;90(1). 015205. https://doi.org/10.1103/PhysRevC.90.015205
Werthmüller, D. ; Witthauer, L. ; 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. ; Costanza, 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. F. ; Metag, V. ; Middleton, D. G. ; Mushkarenkov, A. ; Nefkens, B. M K ; Nikolaev, A. ; Novotny, R. ; Oberle, M. ; Ostrick, M. ; Otte, P. B. ; Oussena, B. ; Pedroni, P. ; Pheron, F. ; Polonski, A. ; Prakhov, S. N. ; Robinson, J. ; Rosner, G. ; Rostomyan, T. ; Schumann, S. ; Sikora, M. H. ; Sober, D. ; Starostin, A. ; Supek, I. ; Thiel, M. ; Thomas, A. ; Unverzagt, M. ; Watts, D. P. / Quasifree photoproduction of mesons off protons and neutrons. In: Physical Review C - Nuclear Physics. 2014 ; Vol. 90, No. 1.
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abstract = "Differential and total cross sections for the quasifree reactions p-p and n- n have been determined at the MAMI-C electron accelerator by using a liquid deuterium target. Photons were produced via bremsstrahlung from the 1.5 GeV incident electron beam and energy tagged with the Glasgow photon tagger. Decay photons of the neutral decay modes -2 and -3{\"I}€0-6 and coincident recoil nucleons were detected in a combined setup of the Crystal Ball and the TAPS calorimeters. The -production cross sections were measured in coincidence with recoil protons, recoil neutrons, and in an inclusive mode without a condition on recoil nucleons, which allowed a check of the internal consistency of the data. The effects from nuclear Fermi motion were removed by a kinematic reconstruction of the final-state invariant mass and possible nuclear effects on the quasifree cross section were investigated by a comparison of free and quasifree-proton data. The results, which represent a significant improvement in statistical quality compared to previous measurements, agree with the known neutron-to-proton cross-section ratio in the peak of the S11(1535) resonance and confirm a peak in the neutron cross section, which is absent for the proton, at a center-of-mass energy W=(1670±5) MeV with an intrinsic width of 30 MeV.",
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T1 - Quasifree photoproduction of mesons off protons and neutrons

AU - Werthmüller, D.

AU - Witthauer, L.

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 - Costanza, 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. F.

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 - Otte, P. B.

AU - Oussena, B.

AU - Pedroni, P.

AU - Pheron, F.

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.

AU - Starostin, A.

AU - Supek, I.

AU - Thiel, M.

AU - Thomas, A.

AU - Unverzagt, M.

AU - Watts, D. P.

PY - 2014/7/25

Y1 - 2014/7/25

N2 - Differential and total cross sections for the quasifree reactions p-p and n- n have been determined at the MAMI-C electron accelerator by using a liquid deuterium target. Photons were produced via bremsstrahlung from the 1.5 GeV incident electron beam and energy tagged with the Glasgow photon tagger. Decay photons of the neutral decay modes -2 and -3Ï€0-6 and coincident recoil nucleons were detected in a combined setup of the Crystal Ball and the TAPS calorimeters. The -production cross sections were measured in coincidence with recoil protons, recoil neutrons, and in an inclusive mode without a condition on recoil nucleons, which allowed a check of the internal consistency of the data. The effects from nuclear Fermi motion were removed by a kinematic reconstruction of the final-state invariant mass and possible nuclear effects on the quasifree cross section were investigated by a comparison of free and quasifree-proton data. The results, which represent a significant improvement in statistical quality compared to previous measurements, agree with the known neutron-to-proton cross-section ratio in the peak of the S11(1535) resonance and confirm a peak in the neutron cross section, which is absent for the proton, at a center-of-mass energy W=(1670±5) MeV with an intrinsic width of 30 MeV.

AB - Differential and total cross sections for the quasifree reactions p-p and n- n have been determined at the MAMI-C electron accelerator by using a liquid deuterium target. Photons were produced via bremsstrahlung from the 1.5 GeV incident electron beam and energy tagged with the Glasgow photon tagger. Decay photons of the neutral decay modes -2 and -3Ï€0-6 and coincident recoil nucleons were detected in a combined setup of the Crystal Ball and the TAPS calorimeters. The -production cross sections were measured in coincidence with recoil protons, recoil neutrons, and in an inclusive mode without a condition on recoil nucleons, which allowed a check of the internal consistency of the data. The effects from nuclear Fermi motion were removed by a kinematic reconstruction of the final-state invariant mass and possible nuclear effects on the quasifree cross section were investigated by a comparison of free and quasifree-proton data. The results, which represent a significant improvement in statistical quality compared to previous measurements, agree with the known neutron-to-proton cross-section ratio in the peak of the S11(1535) resonance and confirm a peak in the neutron cross section, which is absent for the proton, at a center-of-mass energy W=(1670±5) MeV with an intrinsic width of 30 MeV.

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