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; 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; G. Rosner; T. Rostomyan; S. Schumann; M. H. Sikora; D. Sober; A. Starostin; I. Supek; M. Thiel; M. Unverzagt; D. P. Watts

doi:10.1103/PhysRevC.90.015205

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. DrexlerL. 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, G. Rosner, T. Rostomyan, S. Schumann, M. H. Sikora, D. Sober, A. Starostin, I. Supek, M. Thiel, M. Unverzagt, D. P. Watts

Physics

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

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 language	English
Article number	015205
Journal	Physical Review C - Nuclear Physics
Volume	90
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.90.015205
Publication status	Published - 25 Jul 2014

Access to Document

10.1103/PhysRevC.90.015205

Cite this

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., ... Watts, D. P. (2014). Quasifree photoproduction of mesons off protons and neutrons. Physical Review C - Nuclear Physics, 90(1), Article 015205. https://doi.org/10.1103/PhysRevC.90.015205

@article{f7d7e11971e9423885c26014410a2ec3,

title = "Quasifree photoproduction of mesons off protons and neutrons",

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.",

author = "D. Werthm{\"u}ller and L. Witthauer and I. Keshelashvili and P. Aguar-Bartolom{\'e} and J. Ahrens and Annand, {J. R.M.} and Arends, {H. J.} and K. Bantawa and R. Beck and V. Bekrenev and A. Braghieri and D. Branford and Briscoe, {W. J.} and J. Brudvik and S. Cherepnya and S. Costanza and B. Demissie and M. Dieterle and Downie, {E. J.} and P. Drexler and Fil'Kov, {L. V.} and A. Fix and Glazier, {D. I.} and D. Hamilton and E. Heid and D. Hornidge and D. Howdle and Huber, {G. M.} and I. Jaegle and O. Jahn and Jude, {T. C.} and A. K{\"a}ser and Kashevarov, {V. L.} and R. Kondratiev and M. Korolija and Kruglov, {S. P.} and B. Krusche and A. Kulbardis 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 McNicoll, {E. F.} and V. Metag 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 Otte, {P. B.} and B. Oussena and P. Pedroni and F. Pheron and A. Polonski and Prakhov, {S. N.} and G. Rosner and T. Rostomyan and S. Schumann and Sikora, {M. H.} and D. Sober and A. Starostin and I. Supek and M. Thiel and M. Unverzagt and Watts, {D. P.}",

year = "2014",

month = jul,

day = "25",

doi = "10.1103/PhysRevC.90.015205",

language = "English",

volume = "90",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "1",

}

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, Rosner, G, Rostomyan, T, Schumann, S, Sikora, MH, Sober, D, Starostin, A, Supek, I, Thiel, M, 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

TY - JOUR

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 - 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 - 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.

UR - http://www.scopus.com/inward/record.url?scp=84905492625&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.90.015205

DO - 10.1103/PhysRevC.90.015205

M3 - Article

AN - SCOPUS:84905492625

SN - 0556-2813

VL - 90

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 1

M1 - 015205

ER -

Quasifree photoproduction of mesons off protons and neutrons

Abstract

Access to Document

Other files and links

Cite this