Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions

Dieterle, M.; Werthmüller, D.; Abt, S.; Afzal, F.; Aguar Bartolome, P.; Ahmed, Z.; Ahrens, J.; Annand, J. R.  M.; Arends, H. J.; Bashkanov, M.; Beck, R.; Biroth, M.; Borisov, N.; Braghieri, A.; Briscoe, W. J.; Cherepnya, S.; Cividini, F.; Collicott, C.; Costanza, S.; Denig, A.; Downie, E. J.; Drexler, P.; Fil'kov, L. V.; Garni, S.; Glazier, D. I.; Gorodnov, I.; Gradl, W.; Günther, M.; Gurevich, D.; Heijkenskjöld, L.; Hornidge, D.; Huber, G. M.; Käser, A.; Kashevarov, V. L.; Kay, S.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krusche, B.; Lazarev, A.; Lisin, V.; Livingston, K.; Lutterer, S.; MacGregor, I. J.  D.; Manley, D. M.; Martel, P. P.; McGeorge, J. C.; Metag, V.; Middleton, D. G.; Miskimen, R.; Mornacchi, E.; Mushkarenkov, A.; Neganov, A.; Neiser, A.; Oberle, M.; Ostrick, M.; Otte, P. B.; Oussena, B.; Paudyal, D.; Pedroni, P.; Polonski, A.; Prakhov, S. N.; Ron, G.; Rostomyan, T.; Sarty, A.; Sfienti, C.; Sokhoyan, V.; Spieker, K.; Steffen, O.; Strakovsky, I. I.; Strub, T.; Supek, I.; Thiel, A.; Thiel, M.; Thomas, A.; Unverzagt, M.; Usov, Yu. A.; Wagner, S.; Walford, N. K.; Watts, D. P.; Wettig, J.; Witthauer, L.; Wolfes, M.; Zana, L. A.

doi:10.1103/PhysRevC.97.065205

Title: Photoproduction of $π^{0}$ mesons off protons and neutrons in the second and third nucleon resonance regions

Journal Article · 20 June 2018 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.97.065205 · OSTI ID:1456240

Dieterle, M. ^[1]; Werthmüller, D.; Abt, S.; Afzal, F.; Aguar Bartolome, P.; Ahmed, Z.; Ahrens, J.; Annand, J. R. M.; Arends, H. J.; Bashkanov, M.; Beck, R.; Biroth, M.; Borisov, N.; Braghieri, A.; Briscoe, W. J.; Cherepnya, S.; Cividini, F.; Collicott, C.; Costanza, S.; Denig, A. more »

Kent State University

Background: Photoproduction of mesons off quasi-free nucleons bound in the deuteron allows to study the elec- tromagnetic excitation spectrum of the neutron and the isospin structure of the excitation of nucleon resonances. The database for such reactions is much more sparse than for free proton targets. Purpose: Study experimentally single π⁰ photoproduction off quasi-free nucleons from the deuteron. Investigate nuclear effects by a comparison of the results for free protons and quasi-free protons. Use the quasi-free neutron data (corrected for nuclear effects) to test the predictions of reaction models and partial wave analysis (PWA) for $$\gamma$$n → nπ⁰ derived from the analysis of the other isospin channels. Methods: High statistics angular distributions and total cross sections for the photoproduction of π⁰ mesons off the deuteron with coincident detection of recoil nucleons have been measured for the first time. The experiment was performed at the tagged photon beam of the Mainz Microtron (MAMI) accelerator for photon energies between 0.45 GeV and 1.4 GeV, using an almost 4π electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. A complete kinematic reconstruction of the final state removed the effects of Fermi motion. Results: Significant effects from final state interactions (FSI) were observed for participant protons in comparison to free proton targets (between 30% and almost 40%). The data in coincidence with recoil neutrons were corrected for such effects under the assumption that they are identical for participant protons and neutrons. Reaction model predictions and PWA for $$\gamma$$n → nπ⁰, based on fits to data for the other isospin channels, disagreed between themselves and no model provided a good description of the new data. Conclusions: The results demonstrate clearly the importance of a measurement of the fully neutral final state for the isospin decomposition of the cross section. Model refits, for example from the Bonn-Gatchina analysis, show that the new and the previous data for the other three isospin channels can be simultaneously described when the contributions of several partial waves are modified. Finally, the results are also relevant for the suppression of the higher resonance bumps in total photoabsorption on nuclei, which are not well understood.

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Research Organization:: George Washington Univ., Washington, DC (United States); Kent State Univ., Kent, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Contributing Organization:: A2 Collaboration

Grant/Contract Number:: FG02-01ER41194; FG02-88ER40415; FG02-99ER41110; SC0016583

OSTI ID:: 1456240

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 97; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cross section for γ n → π 0 n measured at the Mainz A2 experiment Briscoe, W. J.; Hadžimehmedović, M.; Kudryavtsev, A. E. Physical Review C, Vol. 100, Issue 6 https://doi.org/10.1103/physrevc.100.065205	journal	December 2019

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"pi0n_dcs01" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t1 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs10" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t10 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs11" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t11 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs12" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t12 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs13" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t13 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs14" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t14 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs15" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t15 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs16" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t16 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs17" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t17 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs18" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t18 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs19" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t19 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs02" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t2 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs03" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t3 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs04" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t4 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs05" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t5 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs06" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t6 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs07" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t7 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs08" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t8 The current record is supplemented by this dataset	dataset	January 2022
"pi0n_dcs09" of "Photoproduction of {\boldmath{$\pi^{0}$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region" Collaboration, A2 https://doi.org/10.17182/hepdata.131794.v1/t9 The current record is supplemented by this dataset	dataset	January 2022

Title: Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions

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