First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons
The double-polarization observable E and the helicity-dependent cross sections σ1/2 and σ3/2 have been measured for the first time for single π0 photoproduction from protons and neutrons bound in the deuteron at the electron accelerator facility MAMI in Mainz, Germany. The experiment used a circular...
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Elsevier
2017-07-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269317303775 |
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Article |
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DOAJ |
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English |
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Article |
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DOAJ |
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M. Dieterle L. Witthauer F. Cividini S. Abt P. Achenbach P. Adlarson F. Afzal Z. Ahmed C.S. Akondi J.R.M. Annand H.J. Arends M. Bashkanov R. Beck M. Biroth N.S. Borisov A. Braghieri W.J. Briscoe S. Costanza C. Collicott A. Denig E.J. Downie P. Drexler M.I. Ferretti-Bondy S. Gardner S. Garni D.I. Glazier D. Glowa W. Gradl M. Günther G.M. Gurevich D. Hamilton D. Hornidge G.M. Huber A. Käser V.L. Kashevarov S. Kay I. Keshelashvili R. Kondratiev M. Korolija B. Krusche A.B. Lazarev J.M. Linturi V. Lisin K. Livingston S. Lutterer I.J.D. MacGregor J. Mancell D.M. Manley P.P. Martel V. Metag W. Meyer R. Miskimen E. Mornacchi A. Mushkarenkov A.B. Neganov A. Neiser M. Oberle M. Ostrick P.B. Otte D. Paudyal P. Pedroni A. Polonski S.N. Prakhov A. Rajabi G. Reicherz G. Ron T. Rostomyan A. Sarty C. Sfienti M.H. Sikora V. Sokhoyan K. Spieker O. Steffen I.I. Strakovsky Th. Strub I. Supek A. Thiel M. Thiel A. Thomas M. Unverzagt Yu.A. Usov S. Wagner N.K. Walford D.P. Watts D. Werthmüller J. Wettig M. Wolfes L. Zana |
| spellingShingle |
M. Dieterle L. Witthauer F. Cividini S. Abt P. Achenbach P. Adlarson F. Afzal Z. Ahmed C.S. Akondi J.R.M. Annand H.J. Arends M. Bashkanov R. Beck M. Biroth N.S. Borisov A. Braghieri W.J. Briscoe S. Costanza C. Collicott A. Denig E.J. Downie P. Drexler M.I. Ferretti-Bondy S. Gardner S. Garni D.I. Glazier D. Glowa W. Gradl M. Günther G.M. Gurevich D. Hamilton D. Hornidge G.M. Huber A. Käser V.L. Kashevarov S. Kay I. Keshelashvili R. Kondratiev M. Korolija B. Krusche A.B. Lazarev J.M. Linturi V. Lisin K. Livingston S. Lutterer I.J.D. MacGregor J. Mancell D.M. Manley P.P. Martel V. Metag W. Meyer R. Miskimen E. Mornacchi A. Mushkarenkov A.B. Neganov A. Neiser M. Oberle M. Ostrick P.B. Otte D. Paudyal P. Pedroni A. Polonski S.N. Prakhov A. Rajabi G. Reicherz G. Ron T. Rostomyan A. Sarty C. Sfienti M.H. Sikora V. Sokhoyan K. Spieker O. Steffen I.I. Strakovsky Th. Strub I. Supek A. Thiel M. Thiel A. Thomas M. Unverzagt Yu.A. Usov S. Wagner N.K. Walford D.P. Watts D. Werthmüller J. Wettig M. Wolfes L. Zana First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons Physics Letters B |
| author_facet |
M. Dieterle L. Witthauer F. Cividini S. Abt P. Achenbach P. Adlarson F. Afzal Z. Ahmed C.S. Akondi J.R.M. Annand H.J. Arends M. Bashkanov R. Beck M. Biroth N.S. Borisov A. Braghieri W.J. Briscoe S. Costanza C. Collicott A. Denig E.J. Downie P. Drexler M.I. Ferretti-Bondy S. Gardner S. Garni D.I. Glazier D. Glowa W. Gradl M. Günther G.M. Gurevich D. Hamilton D. Hornidge G.M. Huber A. Käser V.L. Kashevarov S. Kay I. Keshelashvili R. Kondratiev M. Korolija B. Krusche A.B. Lazarev J.M. Linturi V. Lisin K. Livingston S. Lutterer I.J.D. MacGregor J. Mancell D.M. Manley P.P. Martel V. Metag W. Meyer R. Miskimen E. Mornacchi A. Mushkarenkov A.B. Neganov A. Neiser M. Oberle M. Ostrick P.B. Otte D. Paudyal P. Pedroni A. Polonski S.N. Prakhov A. Rajabi G. Reicherz G. Ron T. Rostomyan A. Sarty C. Sfienti M.H. Sikora V. Sokhoyan K. Spieker O. Steffen I.I. Strakovsky Th. Strub I. Supek A. Thiel M. Thiel A. Thomas M. Unverzagt Yu.A. Usov S. Wagner N.K. Walford D.P. Watts D. Werthmüller J. Wettig M. Wolfes L. Zana |
| author_sort |
M. Dieterle |
| title |
First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons |
| title_short |
First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons |
| title_full |
First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons |
| title_fullStr |
First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons |
| title_full_unstemmed |
First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons |
| title_sort |
first measurement of the polarization observable e and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons |
| publisher |
Elsevier |
| series |
Physics Letters B |
| issn |
0370-2693 1873-2445 |
| publishDate |
2017-07-01 |
| description |
The double-polarization observable E and the helicity-dependent cross sections σ1/2 and σ3/2 have been measured for the first time for single π0 photoproduction from protons and neutrons bound in the deuteron at the electron accelerator facility MAMI in Mainz, Germany. The experiment used a circularly polarized photon beam and a longitudinally polarized deuterated butanol target. The reaction products, recoil nucleons and decay photons from the π0 meson were detected with the Crystal Ball and TAPS electromagnetic calorimeters. Effects from nuclear Fermi motion were removed by a kinematic reconstruction of the π0N final state. A comparison to data measured with a free proton target showed that the absolute scale of the cross sections is significantly modified by nuclear final-state interaction (FSI) effects. However, there is no significant effect on the asymmetry E since the σ1/2 and σ3/2 components appear to be influenced in a similar way. Thus, the best approximation of the two helicity-dependent cross sections for the free neutron is obtained by combining the asymmetry E measured with quasi-free neutrons and the unpolarized cross section corrected for FSI effects under the assumption that the FSI effects are similar for neutrons and protons. |
| url |
http://www.sciencedirect.com/science/article/pii/S0370269317303775 |
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doaj-658711e257454f1784fe885a3f48fb732020-11-24T22:30:42ZengElsevierPhysics Letters B0370-26931873-24452017-07-01770C52353110.1016/j.physletb.2017.04.079First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleonsM. Dieterle0L. Witthauer1F. Cividini2S. Abt3P. Achenbach4P. Adlarson5F. Afzal6Z. Ahmed7C.S. Akondi8J.R.M. Annand9H.J. Arends10M. Bashkanov11R. Beck12M. Biroth13N.S. Borisov14A. Braghieri15W.J. Briscoe16S. Costanza17C. Collicott18A. Denig19E.J. Downie20P. Drexler21M.I. Ferretti-Bondy22S. Gardner23S. Garni24D.I. Glazier25D. Glowa26W. Gradl27M. Günther28G.M. Gurevich29D. Hamilton30D. Hornidge31G.M. Huber32A. Käser33V.L. Kashevarov34S. Kay35I. Keshelashvili36R. Kondratiev37M. Korolija38B. Krusche39A.B. Lazarev40J.M. Linturi41V. Lisin42K. Livingston43S. Lutterer44I.J.D. MacGregor45J. Mancell46D.M. Manley47P.P. Martel48V. Metag49W. Meyer50R. Miskimen51E. Mornacchi52A. Mushkarenkov53A.B. Neganov54A. Neiser55M. Oberle56M. Ostrick57P.B. Otte58D. Paudyal59P. Pedroni60A. Polonski61S.N. Prakhov62A. Rajabi63G. Reicherz64G. Ron65T. Rostomyan66A. Sarty67C. Sfienti68M.H. Sikora69V. Sokhoyan70K. Spieker71O. Steffen72I.I. Strakovsky73Th. Strub74I. Supek75A. Thiel76M. Thiel77A. Thomas78M. Unverzagt79Yu.A. Usov80S. Wagner81N.K. Walford82D.P. Watts83D. Werthmüller84J. Wettig85M. Wolfes86L. Zana87Department of Physics, University of Basel, Basel, SwitzerlandDepartment of Physics, University of Basel, Basel, SwitzerlandInstitut für Kernphysik, University of Mainz, Mainz, GermanyDepartment of Physics, University of Basel, Basel, SwitzerlandInstitut für Kernphysik, University of Mainz, Mainz, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanyHelmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn, GermanyUniversity of Regina, Regina, SK S4S 0A2, CanadaKent State University, Kent, OH, USASUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UKInstitut für Kernphysik, University of Mainz, Mainz, GermanySUPA School of Physics, University of Edinburgh, Edinburgh EEH9 3JZ, UKHelmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanyJoint Institute for Nuclear Research, 141980 Dubna, RussiaINFN Sezione di Pavia, Pavia, ItalyCenter for Nuclear Studies, The George Washington University, Washington, DC, USAINFN Sezione di Pavia, Pavia, ItalyDepartment of Astronomy and Physics, Saint Marys University, Halifax, CanadaInstitut für Kernphysik, University of Mainz, Mainz, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanySUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UKDepartment of Physics, University of Basel, Basel, SwitzerlandSUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UKSUPA School of Physics, University of Edinburgh, Edinburgh EEH9 3JZ, UKInstitut für Kernphysik, University of Mainz, Mainz, GermanyDepartment of Physics, University of Basel, Basel, SwitzerlandInstitute for Nuclear Research, Moscow, RussiaSUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UKMount Allison University, Sackville, New Brunswick E4L 1E6, CanadaUniversity of Regina, Regina, SK S4S 0A2, CanadaDepartment of Physics, University of Basel, Basel, SwitzerlandInstitut für Kernphysik, University of Mainz, Mainz, GermanySUPA School of Physics, University of Edinburgh, Edinburgh EEH9 3JZ, UKDepartment of Physics, University of Basel, Basel, SwitzerlandInstitute for Nuclear Research, Moscow, RussiaRudjer Boskovic Institute, Zagreb, CroatiaDepartment of Physics, University of Basel, Basel, SwitzerlandJoint Institute for Nuclear Research, 141980 Dubna, RussiaInstitut für Kernphysik, University of Mainz, Mainz, GermanyInstitute for Nuclear Research, Moscow, RussiaSUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UKDepartment of Physics, University of Basel, Basel, SwitzerlandSUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UKSUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UKKent State University, Kent, OH, USAInstitut für Kernphysik, University of Mainz, Mainz, GermanyII. Physikalisches Institut, University of Giessen, GermanyInstitut für Experimentalphysik, Ruhr Universität, 44780 Bochum, GermanyUniversity of Massachusetts Amherst, Amherst, MA 01003, USAInstitut für Kernphysik, University of Mainz, Mainz, GermanyInstitute for Nuclear Research, Moscow, RussiaJoint Institute for Nuclear Research, 141980 Dubna, RussiaInstitut für Kernphysik, University of Mainz, Mainz, GermanyDepartment of Physics, University of Basel, Basel, SwitzerlandInstitut für Kernphysik, University of Mainz, Mainz, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanyUniversity of Regina, Regina, SK S4S 0A2, CanadaINFN Sezione di Pavia, Pavia, ItalyInstitute for Nuclear Research, Moscow, RussiaInstitut für Kernphysik, University of Mainz, Mainz, GermanyUniversity of Massachusetts Amherst, Amherst, MA 01003, USAInstitut für Experimentalphysik, Ruhr Universität, 44780 Bochum, GermanyRacah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, IsraelDepartment of Physics, University of Basel, Basel, SwitzerlandDepartment of Astronomy and Physics, Saint Marys University, Halifax, CanadaInstitut für Kernphysik, University of Mainz, Mainz, GermanySUPA School of Physics, University of Edinburgh, Edinburgh EEH9 3JZ, UKInstitut für Kernphysik, University of Mainz, Mainz, GermanyHelmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanyCenter for Nuclear Studies, The George Washington University, Washington, DC, USADepartment of Physics, University of Basel, Basel, SwitzerlandRudjer Boskovic Institute, Zagreb, CroatiaHelmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanyJoint Institute for Nuclear Research, 141980 Dubna, RussiaInstitut für Kernphysik, University of Mainz, Mainz, GermanyDepartment of Physics, University of Basel, Basel, SwitzerlandSUPA School of Physics, University of Edinburgh, Edinburgh EEH9 3JZ, UKDepartment of Physics, University of Basel, Basel, SwitzerlandInstitut für Kernphysik, University of Mainz, Mainz, GermanyInstitut für Kernphysik, University of Mainz, Mainz, GermanySUPA School of Physics, University of Edinburgh, Edinburgh EEH9 3JZ, UKThe double-polarization observable E and the helicity-dependent cross sections σ1/2 and σ3/2 have been measured for the first time for single π0 photoproduction from protons and neutrons bound in the deuteron at the electron accelerator facility MAMI in Mainz, Germany. The experiment used a circularly polarized photon beam and a longitudinally polarized deuterated butanol target. The reaction products, recoil nucleons and decay photons from the π0 meson were detected with the Crystal Ball and TAPS electromagnetic calorimeters. Effects from nuclear Fermi motion were removed by a kinematic reconstruction of the π0N final state. A comparison to data measured with a free proton target showed that the absolute scale of the cross sections is significantly modified by nuclear final-state interaction (FSI) effects. However, there is no significant effect on the asymmetry E since the σ1/2 and σ3/2 components appear to be influenced in a similar way. Thus, the best approximation of the two helicity-dependent cross sections for the free neutron is obtained by combining the asymmetry E measured with quasi-free neutrons and the unpolarized cross section corrected for FSI effects under the assumption that the FSI effects are similar for neutrons and protons.http://www.sciencedirect.com/science/article/pii/S0370269317303775 |