Measurement of the 1H(γ, p)π0 reaction using a novel nucleon spin polarimeter

M H Sikora¹, D P Watts¹, D I Glazier¹, P Aguar-Bartolomé², L K Akasoy², J R M Annand³, H J Arends², K Bantawa⁴, R Beck⁵, V S Bekrenev⁶, H Berghäuser⁷, A Braghieri⁸, D Branford¹, W J Briscoe⁹, J Brudvik¹⁰, S Cherepnya¹¹, R F B Codling³, B T Demissie⁹, E J Downie¹², P Drexler⁷, L V Fil'kov¹¹, B Freehart⁹, R Gregor⁷, D Hamilton³, E Heid¹³, D Hornidge¹⁴, D A Howdle³, I Jaegle¹⁵, O Jahn², T C Jude¹, V L Kashevarov¹¹, I Keshelashvili¹⁵, R Kondratiev¹⁶, M Korolija¹⁷, M Kotulla⁷, A A Koulbardis⁶, S P Kruglov⁶, B Krusche¹⁵, V Lisin¹⁶, K Livingston³, I J D MacGregor³, Y Maghrbi¹⁵, D M Manley⁴, Z Marinides⁹, M Martinez², J C McGeorge³, B McKinnon³, E F McNicoll³, D Mekterovic¹⁷, V Metag⁷, S Micanovic¹⁷, D G Middleton¹⁴, A Mushkarenkov⁸, B M K Nefkens¹⁰, A Nikolaev⁵, R Novotny⁷, M Ostrick², P B Otte², B Oussena¹³, P Pedroni⁸, F Pheron¹⁵, A Polonski¹⁶, S Prakhov¹⁰, J Robinson³, G Rosner³, T Rostomyan⁸, S Schumann², D I Sober¹⁸, A Starostin¹⁰, I I Strakovsky⁹, I M Suarez¹⁰, I Supek¹⁷, M Thiel⁷, A Thomas², M Unverzagt², D Werthmüller¹⁵, R L Workman⁹, I Zamboni¹⁷, F Zehr¹⁵; (A2 Collaboration at MAMI)

Affiliations

¹ SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
² Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
³ SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁴ Kent State University, Kent, Ohio 44242, USA.
⁵ Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, D-53115 Bonn, Germany.
⁶ Petersburg Nuclear Physics Institute, 188300 Gatchina, Russia.
⁷ II Physikalisches Institut, University of Giessen, D-35392 Giessen, Germany.
⁸ INFN Sezione di Pavia, I-27100 Pavia, Italy.
⁹ The George Washington University, Washington, D.C. 20052, USA.
¹⁰ University of California Los Angeles, Los Angeles, California 90095-1547, USA.
¹¹ Lebedev Physical Institute, 119991 Moscow, Russia.
¹² Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany and SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom and The George Washington University, Washington, D.C. 20052, USA.
¹³ Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany and The George Washington University, Washington, D.C. 20052, USA.
¹⁴ Mount Allison University, Sackville, New Brunswick E4L3B5, Canada.
¹⁵ Department Physik, University of Basel, CH-4056 Basel, Switzerland.
¹⁶ Institute for Nuclear Research, 125047 Moscow, Russia.
¹⁷ Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
¹⁸ The Catholic University of America, Washington D.C. 20064, USA.

PMID: 24484003
DOI: 10.1103/PhysRevLett.112.022501

Measurement of the 1H(γ, p)π0 reaction using a novel nucleon spin polarimeter

M H Sikora et al. Phys Rev Lett. 2014.

. 2014 Jan 17;112(2):022501.

doi: 10.1103/PhysRevLett.112.022501. Epub 2014 Jan 15.

Authors

Affiliations

¹ SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
² Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
³ SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁴ Kent State University, Kent, Ohio 44242, USA.
⁵ Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, D-53115 Bonn, Germany.
⁶ Petersburg Nuclear Physics Institute, 188300 Gatchina, Russia.
⁷ II Physikalisches Institut, University of Giessen, D-35392 Giessen, Germany.
⁸ INFN Sezione di Pavia, I-27100 Pavia, Italy.
⁹ The George Washington University, Washington, D.C. 20052, USA.
¹⁰ University of California Los Angeles, Los Angeles, California 90095-1547, USA.
¹¹ Lebedev Physical Institute, 119991 Moscow, Russia.
¹² Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany and SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom and The George Washington University, Washington, D.C. 20052, USA.
¹³ Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany and The George Washington University, Washington, D.C. 20052, USA.
¹⁴ Mount Allison University, Sackville, New Brunswick E4L3B5, Canada.
¹⁵ Department Physik, University of Basel, CH-4056 Basel, Switzerland.
¹⁶ Institute for Nuclear Research, 125047 Moscow, Russia.
¹⁷ Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
¹⁸ The Catholic University of America, Washington D.C. 20064, USA.

PMID: 24484003
DOI: 10.1103/PhysRevLett.112.022501

Abstract

We report the first large-acceptance measurement of polarization transfer from a polarized photon beam to a recoiling nucleon. The measurement pioneers a novel polarimetry technique, which can be applied to many other nuclear and hadron physics experiments. The commissioning reaction of 1H(γ, p)π0 in the range 0.4<Eγ<1.4 GeV validates the technique and provides essential new data to constrain the excitation spectrum of the nucleon.

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Measurement of the 1H(γ, p)π0 reaction using a novel nucleon spin polarimeter

Affiliations

Measurement of the 1H(γ, p)π0 reaction using a novel nucleon spin polarimeter

Authors

Affiliations

Abstract

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