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

Abstract

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 γn → 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 observedmore »« less

Authors:: 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. more »« less

Publication Date:: Thu Jun 21 00:00:00 EDT 2018

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

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Org.:: A2 Collaboration

OSTI Identifier:: 1456240

Alternate Identifier(s):: OSTI ID: 1456273; OSTI ID: 1464050

Grant/Contract Number:: FG02-01ER41194; FG02-99ER41110; FG02-88ER40415; PHY-1039130; IIA-1358175; SC0016583

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 97; Journal Issue: 6; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Pion Photoproduction; Final-State Interactions; photonuclear reactions; baryons; light mesons

Citation Formats


                    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., and Zana, L. A. Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions.  United States: N. p., 2018. 
Web.  doi:10.1103/PhysRevC.97.065205.

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                    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. Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions.  United States.  https://doi.org/10.1103/PhysRevC.97.065205

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                    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., and Zana, L. A. Thu .  
"Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions".  United States.  https://doi.org/10.1103/PhysRevC.97.065205.  https://www.osti.gov/servlets/purl/1456240.

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@article{osti_1456240,

  title        = {Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions},

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

  abstractNote = {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 γn → 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 γn → 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.},

  doi          = {10.1103/PhysRevC.97.065205},

  journal      = {Physical Review C},

  number       = 6,

  volume       = 97,

  place        = {United States},

  year         = {Thu Jun 21 00:00:00 EDT 2018},

  month        = {Thu Jun 21 00:00:00 EDT 2018}

}

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Witthauer, L.; Dieterle, M.; Abt, S.
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Anisovich, A. V.; Klempt, E.; Nikonov, V. A.
The European Physical Journal A, Vol. 44, Issue 2
DOI: 10.1140/epja/i2010-10950-x

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DOI: 10.1103/PhysRevLett.112.012003

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Hartmann, J.; Dutz, H.; Anisovich, A. V.
Physics Letters B, Vol. 748
DOI: 10.1016/j.physletb.2015.07.008

Measurement of the beam-helicity asymmetry <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msup><mml:mrow><mml:mi>I</mml:mi></mml:mrow><mml:mrow><mml:mo>⊙</mml:mo></mml:mrow></mml:msup></mml:math> in the photoproduction of <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:math>-pairs off the proton and off the neutron
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Oberle, M.; Krusche, B.; Ahrens, J.
Physics Letters B, Vol. 721, Issue 4-5
DOI: 10.1016/j.physletb.2013.03.021

The isospin structure of photoproduction of πη pairs from the nucleon in the threshold region
journal, September 2015

Käser, A.; Ahrens, J.; Annand, J. R. M.
Physics Letters B, Vol. 748
DOI: 10.1016/j.physletb.2015.07.007

A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
journal, January 1999

Drechsel, D.; Hanstein, O.; Kamalov, S. S.
Nuclear Physics A, Vol. 645, Issue 1
DOI: 10.1016/S0375-9474(98)00572-7

A focal plane system for the 855 MeV tagged photon spectrometer at MAMI-B
journal, January 1996

Hall, S. J.; Miller, G. J.; Beck, R.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 368, Issue 3
DOI: 10.1016/0168-9002(95)00661-3

Photoproduction of $\eta$ η mesons from the neutron: Cross sections and double polarization observable E
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Witthauer, L.; Dieterle, M.; Afzal, F.
The European Physical Journal A, Vol. 53, Issue 3
DOI: 10.1140/epja/i2017-12247-0

Status Report on the Normal Conducting CW Racetrack Microtron Cascade "MAMI"
journal, August 1983

Herminghaus, H.; Dreher, B.; Futeneuer, B.
IEEE Transactions on Nuclear Science, Vol. 30, Issue 4
DOI: 10.1109/TNS.1983.4336636

Analysis of pion photoproduction data
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Arndt, R. A.; Briscoe, W. J.; Strakovsky, I. I.
Physical Review C, Vol. 66, Issue 5
DOI: 10.1103/PhysRevC.66.055213

Differential cross section measurements for $γ n \to π^{-} p$ above the first nucleon resonance region
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Mattione, P. T.; Carman, D. S.; Strakovsky, I. I.
Physical Review C, Vol. 96, Issue 3
DOI: 10.1103/PhysRevC.96.035204

Threshold $π^{0}$ photoproduction on transverse polarised protons at MAMI
journal, November 2015

Schumann, S.; Otte, P. B.; Akondi, C. S.
Physics Letters B, Vol. 750
DOI: 10.1016/j.physletb.2015.09.015

Photon asymmetry measurements of $\overrightarrow{\gamma}p \rightarrow \pi^{0} p$ γ → p → π 0 p for $E_{\gamma}=$ E γ = 320-650 MeV
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Gardner, S.; Howdle, D.; Sikora, M. H.
The European Physical Journal A, Vol. 52, Issue 11
DOI: 10.1140/epja/i2016-16333-5

Measurement of πphotoproduction on the proton from 550 to 1500 MeV at GRAAL
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Bartalini, O.; Bellini, V.; Bocquet, J. P.
The European Physical Journal A, Vol. 26, Issue 3
DOI: 10.1140/epja/i2005-10191-2

First measurement of the polarization observable E and helicity-dependent cross sections in single π 0 photoproduction from quasi-free nucleons
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Dieterle, M.; Witthauer, L.; Cividini, F.
Physics Letters B, Vol. 770
DOI: 10.1016/j.physletb.2017.04.079

Double-polarization observable G in neutral-pion photoproduction off the proton
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Thiel, A.; Eberhardt, H.; Lang, M.
The European Physical Journal A, Vol. 53, Issue 1
DOI: 10.1140/epja/i2017-12194-8

$< ‘ γ^{*} \vec{N} Δ$ transition form factors: A new analysis of data on ${p (e, e}^{'} p) π^{0}$ at $Q^{2} = 2.8$ and $4.0 (GeV {/ c)}^{2}$
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Kamalov, Sabit S.; Nan Yang, Shin; Drechsel, Dieter
Physical Review C, Vol. 64, Issue 3
DOI: 10.1103/PhysRevC.64.032201

$π^{0}$ photoproduction on the proton for photon energies from 0.675 to 2.875 GeV
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Dugger, M.; Ritchie, B. G.; Ball, J. P.
Physical Review C, Vol. 76, Issue 2
DOI: 10.1103/PhysRevC.76.025211

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Agostinelli, S.; Allison, J.; Amako, K.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3
DOI: 10.1016/S0168-9002(03)01368-8

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journal, March 2004

Kossert, K.; Camen, M.; Wissmann, F.
The European Physical Journal A, Vol. 19, Issue 3
DOI: 10.1140/epja/i2003-10130-3

Complete kinematical study of the 3 $\alpha$ breakup of the 16.11 MeV state in 12C
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Laursen, K. L.; Fynbo, H. O. U.; Kirsebom, O. S.
The European Physical Journal A, Vol. 52, Issue 9
DOI: 10.1140/epja/i2016-16271-2

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Zehr, F.; Krusche, B.; Aguar, P.
The European Physical Journal A, Vol. 48, Issue 7
DOI: 10.1140/epja/i2012-12098-1

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Ahrens, J.; Altieri, S.; Annand, J. R. M.
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DOI: 10.1140/epja/i2010-10946-6

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Dieterle, M.; Oberle, M.; Ahrens, J.
The European Physical Journal A, Vol. 51, Issue 11
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Design of the pluto event generator
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Fröhlich, I.; Galatyuk, T.; Holzmann, R.
Journal of Physics: Conference Series, Vol. 219, Issue 3
DOI: 10.1088/1742-6596/219/3/032039

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journal, March 2016

Tarasov, V. E.; Briscoe, W. J.; Dieterle, M.
Physics of Atomic Nuclei, Vol. 79, Issue 2
DOI: 10.1134/S1063778816020186

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

Abstract

Citation Formats

Influence of final-state interaction on incoherent pion photoproduction on the deuteron in the region of the Δ-resonance journal, January 2003

Evaluation of the γ n → π − p differential cross section in the Δ -isobar region journal, December 2012

Electromagnetic couplings of nucleon resonances journal, January 1997

Unitary isobar model --MAID2007 journal, October 2007

Measurement of the beam-helicity asymmetry I⊙ in the photoproduction of $ \pi^{0}$ $ \pi^{\pm}$ pairs off protons and off neutrons journal, March 2014

Photon- and meson-induced reactions on the nucleon journal, January 1999

Multichannel parametrization of π N scattering amplitudes and extraction of resonance parameters journal, November 2012

Quasifree photoproduction of η mesons off protons and neutrons journal, July 2014

Review of Particle Physics journal, October 2016

Measurement of the reaction γd → π−pp, and determination of cross sections for the reaction γn → π−p, at photon energies between 0.2 and 2.0 GeV journal, November 1973

Design of a tagged photon spectrometer for use with the Mainz 840 MeV microtron journal, March 1991

Measurement of the H 1 ( γ⃗ , p⃗ ) π 0 Reaction Using a Novel Nucleon Spin Polarimeter journal, January 2014

Response of TAPS to monochromatic photons with energies between 45 and 790 MeV journal, July 1994

Neutral-PionPhotoproduction off Protons in the Energy Range 0.3 G e V < E γ < 3 G e V journal, January 2005

Study of non-strange baryon resonances with meson photoproduction journal, January 2003

Completeness rules for spin observables in pseudoscalar meson photoproduction journal, April 1997

The BaF/sub 2/ photon spectrometer TAPS journal, April 1991

Photoproduction of $ \eta{^\prime}$ -mesons off the deuteron journal, January 2011

Well-Established Nucleon Resonances Revisited by Double-Polarization Measurements journal, September 2012

Photoproduction of π 0 Mesons off Neutrons in the Nucleon Resonance Region journal, April 2014

The Mainz microtron facility MAMI journal, January 1990

Narrow Structure in the Excitation Function of η Photoproduction off the Neutron journal, December 2013

Measurement of the beam asymmetry Σ in the forward direction for γ⃗ p → p π 0 journal, June 2010

Beam-Target Helicity Asymmetry for γ → n → → π − p in the N * Resonance Region journal, June 2017

Quasi-free photoproduction of η-mesons off the deuteron journal, August 2011

Extracting the photoproduction cross sections off the neutron, via the γ n → π − p reaction, from deuteron data with final-state interaction effects journal, September 2011

Single and double πo-photoproduction from the deuteron journal, November 1999

Photoproduction of mesons off nuclei journal, September 2011

Upgrade of the Glasgow photon tagging spectrometer for Mainz MAMI-C journal, June 2008

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction journal, November 2009

Photoproduction of neutral pions off protons journal, November 2011

Radiative π0 photoproduction on protons in the Δ+ (1232) region journal, February 2010

Effective Lagrangian Approach to pion photoproduction from the nucleon journal, June 2006

Parametrization of the deuteron wave function of the Paris NN potential journal, May 1981

Coupled-channel dynamics in the reactions πN → πN, ηN, KΛ, KΣ journal, April 2013

Measurement of K − p → η Λ near threshold journal, October 2001

Photoproduction of positive pions from hydrogen with PHOENICS at ELSA journal, April 1994

Amplitude analysis of γ n → π − p data above 1 GeV journal, July 2012

Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in $ \pi^{0}_{}$ photoproduction off the proton journal, February 2009

Helicity amplitudes for photoexcitation of nucleon resonances off neutrons journal, June 2013

Measurement of π 0 photoproduction on the proton at MAMI C journal, August 2015

Quasi-free photoproduction of η-mesons off 3He nuclei journal, December 2013

Photoproduction of πmesons off protons from the Δ(1232) region to Eγ = 3 GeV journal, January 2007

Unified Chew-Mandelstam SAID analysis of pion photoproduction data journal, July 2012

Neutral pion photoproduction from the proton near threshold journal, January 1996

Measurement of $ \Sigma$ beam asymmetry in $ \pi^{0}_{}$ photoproduction off the neutron in the second and third resonances region⋆ journal, October 2009

Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons journal, May 2017

T and F asymmetries in π 0 photoproduction on the proton journal, May 2016

The 1.5GeV harmonic double-sided microtron at Mainz University journal, August 2008

Insight into the Narrow Structure in η Photoproduction on the Neutron from Helicity-Dependent Cross Sections journal, September 2016

Photoproduction of pions and properties of baryon resonances from a Bonn-Gatchina partial-wave analysis journal, April 2010

First Measurement of the Helicity Asymmetry for γ p → p π 0 in the Resonance Region journal, January 2014

The polarization observables T , P , and H and their impact on γ p → p π 0 multipoles journal, September 2015

The isospin structure of photoproduction of πη pairs from the nucleon in the threshold region journal, September 2015

A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV journal, January 1999

A focal plane system for the 855 MeV tagged photon spectrometer at MAMI-B journal, January 1996

Photoproduction of $\eta$ η mesons from the neutron: Cross sections and double polarization observable E journal, March 2017

Status Report on the Normal Conducting CW Racetrack Microtron Cascade "MAMI" journal, August 1983

Analysis of pion photoproduction data journal, November 2002

Differential cross section measurements for γ n → π − p above the first nucleon resonance region journal, September 2017

Threshold π 0 photoproduction on transverse polarised protons at MAMI journal, November 2015

Photon asymmetry measurements of $\overrightarrow{\gamma}p \rightarrow \pi^{0} p$ γ → p → π 0 p for $E_{\gamma}=$ E γ = 320-650 MeV journal, November 2016

Measurement of πphotoproduction on the proton from 550 to 1500 MeV at GRAAL journal, December 2005

First measurement of the polarization observable E and helicity-dependent cross sections in single π 0 photoproduction from quasi-free nucleons journal, July 2017

Double-polarization observable G in neutral-pion photoproduction off the proton journal, January 2017

< ‘ γ * N → Δ transition form factors: A new analysis of data on p ( e , e ′ p ) π 0 at Q 2 = 2.8 and 4.0 ( GeV / c ) 2 journal, August 2001

π 0 photoproduction on the proton for photon energies from 0.675 to 2.875 GeV journal, August 2007

Geant4—a simulation toolkit journal, July 2003

Quasi-free $\pi^0$ photoproduction from the bound nucleon journal, March 2004

Complete kinematical study of the 3 $\alpha$ breakup of the 16.11 MeV state in 12C journal, September 2016

Photoproduction of π0π0 - and π0π+ -pairs off the proton from threshold to the second resonance region journal, July 2012

Helicity dependence of the $ \gamma$d $ \rightarrow$ $ \pi$NN reactions in the $ \Delta$ -resonance region journal, March 2010

Photoproduction of $ \pi^{0}$ -pairs off protons and off neutrons journal, November 2015

Design of the pluto event generator journal, April 2010

On the extraction of cross sections for π0 and η photoproduction off neutrons from deuteron data journal, March 2016

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

Influence of final-state interaction on incoherent pion photoproduction on the deuteron in the region of the Δ-resonance
journal, January 2003

Evaluation of the $γ n \to π^{-} p$ differential cross section in the $Δ$ -isobar region
journal, December 2012

Electromagnetic couplings of nucleon resonances
journal, January 1997

Unitary isobar model --MAID2007
journal, October 2007

Measurement of the beam-helicity asymmetry I⊙ in the photoproduction of $ \pi^{0}$ $ \pi^{\pm}$ pairs off protons and off neutrons
journal, March 2014

Photon- and meson-induced reactions on the nucleon
journal, January 1999

Multichannel parametrization of $π N$ scattering amplitudes and extraction of resonance parameters
journal, November 2012

Quasifree photoproduction of $η$ mesons off protons and neutrons
journal, July 2014

Review of Particle Physics
journal, October 2016

Measurement of the reaction γd → π−pp, and determination of cross sections for the reaction γn → π−p, at photon energies between 0.2 and 2.0 GeV
journal, November 1973

Design of a tagged photon spectrometer for use with the Mainz 840 MeV microtron
journal, March 1991

Measurement of the ${}^{1}H (γ⃗, p⃗) π^{0}$ Reaction Using a Novel Nucleon Spin Polarimeter
journal, January 2014

Response of TAPS to monochromatic photons with energies between 45 and 790 MeV
journal, July 1994

Neutral-PionPhotoproduction off Protons in the Energy Range $0.3 G e V < E_{γ} < 3 G e V$
journal, January 2005

Study of non-strange baryon resonances with meson photoproduction
journal, January 2003

Completeness rules for spin observables in pseudoscalar meson photoproduction
journal, April 1997

The BaF/sub 2/ photon spectrometer TAPS
journal, April 1991

Photoproduction of $ \eta{^\prime}$ -mesons off the deuteron
journal, January 2011

Well-Established Nucleon Resonances Revisited by Double-Polarization Measurements
journal, September 2012

Photoproduction of $π^{0}$ Mesons off Neutrons in the Nucleon Resonance Region
journal, April 2014

The Mainz microtron facility MAMI
journal, January 1990

Narrow Structure in the Excitation Function of $η$ Photoproduction off the Neutron
journal, December 2013

Measurement of the beam asymmetry $Σ$ in the forward direction for $γ⃗ p \to p π^{0}$
journal, June 2010

Beam-Target Helicity Asymmetry for $\vec{γ} \vec{n} \to π^{-} p$ in the $N^{*}$ Resonance Region
journal, June 2017

Quasi-free photoproduction of η-mesons off the deuteron
journal, August 2011

Extracting the photoproduction cross sections off the neutron, via the $γ n \to π^{-} p$ reaction, from deuteron data with final-state interaction effects
journal, September 2011

Single and double πo-photoproduction from the deuteron
journal, November 1999

Photoproduction of mesons off nuclei
journal, September 2011

Upgrade of the Glasgow photon tagging spectrometer for Mainz MAMI-C
journal, June 2008

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction
journal, November 2009

Photoproduction of neutral pions off protons
journal, November 2011

Radiative π0 photoproduction on protons in the Δ+ (1232) region
journal, February 2010

Effective Lagrangian Approach to pion photoproduction from the nucleon
journal, June 2006

Parametrization of the deuteron wave function of the Paris NN potential
journal, May 1981

Coupled-channel dynamics in the reactions πN → πN, ηN, KΛ, KΣ
journal, April 2013

Measurement of $K^{-} \vec{p} η Λ$ near threshold
journal, October 2001

Photoproduction of positive pions from hydrogen with PHOENICS at ELSA
journal, April 1994

Amplitude analysis of $γ n \to π^{-} p$ data above 1 GeV
journal, July 2012

Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in $ \pi^{0}_{}$ photoproduction off the proton
journal, February 2009

Helicity amplitudes for photoexcitation of nucleon resonances off neutrons
journal, June 2013

Measurement of $π^{0}$ photoproduction on the proton at MAMI C
journal, August 2015

Quasi-free photoproduction of η-mesons off 3He nuclei
journal, December 2013

Photoproduction of πmesons off protons from the Δ(1232) region to Eγ = 3 GeV
journal, January 2007

Unified Chew-Mandelstam SAID analysis of pion photoproduction data
journal, July 2012

Neutral pion photoproduction from the proton near threshold
journal, January 1996

Measurement of $ \Sigma$ beam asymmetry in $ \pi^{0}_{}$ photoproduction off the neutron in the second and third resonances region⋆
journal, October 2009

Helicity-dependent cross sections and double-polarization observable $E$ in $η$ photoproduction from quasifree protons and neutrons
journal, May 2017

$T$ and $F$ asymmetries in $π^{0}$ photoproduction on the proton
journal, May 2016

The 1.5GeV harmonic double-sided microtron at Mainz University
journal, August 2008

Insight into the Narrow Structure in $η$ Photoproduction on the Neutron from Helicity-Dependent Cross Sections
journal, September 2016

Photoproduction of pions and properties of baryon resonances from a Bonn-Gatchina partial-wave analysis
journal, April 2010

First Measurement of the Helicity Asymmetry for $γ p \to p π^{0}$ in the Resonance Region
journal, January 2014

The polarization observables T , P , and H and their impact on $γ p \to p π^{0}$ multipoles
journal, September 2015

The isospin structure of photoproduction of πη pairs from the nucleon in the threshold region
journal, September 2015

A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
journal, January 1999

A focal plane system for the 855 MeV tagged photon spectrometer at MAMI-B
journal, January 1996

Photoproduction of $\eta$ η mesons from the neutron: Cross sections and double polarization observable E
journal, March 2017

Status Report on the Normal Conducting CW Racetrack Microtron Cascade "MAMI"
journal, August 1983

Analysis of pion photoproduction data
journal, November 2002

Differential cross section measurements for $γ n \to π^{-} p$ above the first nucleon resonance region
journal, September 2017

Threshold $π^{0}$ photoproduction on transverse polarised protons at MAMI
journal, November 2015

Photon asymmetry measurements of $\overrightarrow{\gamma}p \rightarrow \pi^{0} p$ γ → p → π 0 p for $E_{\gamma}=$ E γ = 320-650 MeV
journal, November 2016

Measurement of πphotoproduction on the proton from 550 to 1500 MeV at GRAAL
journal, December 2005

First measurement of the polarization observable E and helicity-dependent cross sections in single π 0 photoproduction from quasi-free nucleons
journal, July 2017

Double-polarization observable G in neutral-pion photoproduction off the proton
journal, January 2017

$< ‘ γ^{*} \vec{N} Δ$ transition form factors: A new analysis of data on ${p (e, e}^{'} p) π^{0}$ at $Q^{2} = 2.8$ and $4.0 (GeV {/ c)}^{2}$
journal, August 2001

$π^{0}$ photoproduction on the proton for photon energies from 0.675 to 2.875 GeV
journal, August 2007

Geant4—a simulation toolkit
journal, July 2003

Quasi-free $\pi^0$ photoproduction from the bound nucleon
journal, March 2004

Complete kinematical study of the 3 $\alpha$ breakup of the 16.11 MeV state in 12C
journal, September 2016

Photoproduction of π0π0 - and π0π+ -pairs off the proton from threshold to the second resonance region
journal, July 2012

Helicity dependence of the $ \gamma$d $ \rightarrow$ $ \pi$NN reactions in the $ \Delta$ -resonance region
journal, March 2010

Photoproduction of $ \pi^{0}$ -pairs off protons and off neutrons
journal, November 2015

Design of the pluto event generator
journal, April 2010

On the extraction of cross sections for π0 and η photoproduction off neutrons from deuteron data
journal, March 2016