Measurements of 12C (γ⃗,pp)(\vec{\gamma},pp)(γ<path d='M377 20c0-5.333 1.833-10 5.5-14S391 0 397 0c4.667 0 8.667 1.667 12 5

3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 11 10.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63 -1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1 -7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59 H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359 c-16-25.333-24-45-24-59z'/>​,pp) photon asymmetries for Eγ=200E_{\gamma}=200Eγ​=200 –450 MeV (original) (raw)

Abstract

The 12C\((\vec{\gamma},pp)\) reaction has been studied in the photon energy range 200-450 MeV at the Mainz microtron MAMI-C, where linearly polarised photons were energy-tagged using the Glasgow-Mainz Tagged Photon Spectrometer and protons were detected in the Crystal Ball detector. The photon asymmetry \(\Sigma\) has been measured over a wider \(E_{\gamma}\) range than previous measurements. The strongest asymmetries were found at low missing energies where direct emission of nucleon pairs is expected. Cuts on the difference in azimuthal angles of the two ejected protons increased the magnitude of the observed asymmetries. At low missing energies the \(\Sigma\) data exhibit a strong angular dependence, similar to deuteron photodisintegration.

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Authors and Affiliations

  1. SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    J. Robinson, I. J. D. MacGregor, J. R. M. Annand, R. F. B. Codling, D. Hamilton, D. Howdle, K. Livingston, J. C. McGeorge, E. F. McNicoll, R. O. Owens & G. Rosner
  2. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    P. Aguar-Bartolomé, L. K. Akasoy, H. J. Arends, E. J. Downie, P. Drexler, E. Heid, O. Jahn, D. G. Middleton, M. Ostrick, P. B. Otte, B. Oussena, S. Schumann, A. Thomas & M. Unverzagt
  3. Petersburg Nuclear Physics Institute, 188300, Gatchina, Russia
    Ya. I. Azimov, V. S. Bekrenev, A. A. Koulbardis & S. P. Kruglov
  4. Kent State University, 44242, Kent, Ohio, USA
    K. Bantawa & D. M. Manley
  5. Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115, Bonn, Germany
    R. Beck & A. Nikolaev
  6. II Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    H. Berghäuser, R. Gregor, M. Kotulla, V. Metag, R. Novotny & M. Thiel
  7. INFN Sezione di Pavia, I-27100, Pavia, Italy
    A. Braghieri, A. Mushkarenkov, P. Pedroni & T. Rostomyan
  8. SUPA, School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    D. Branford, D. I. Glazier, T. C. Jude, M. H. Sikora, C. M. Tarbert & D. P. Watts
  9. The George Washington University, 20052, Washington, DC, USA
    W. J. Briscoe, B. T. Demissie & I. I. Strakovsky
  10. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    J. Brudvik, B. M. K. Nefkens, S. Prakhov, A. Starostin & I. M. Suarez
  11. Lebedev Physical Institute, 119991, Moscow, Russia
    S. Cherepnya, L. V. Fil’kov & V. L. Kashevarov
  12. Institut für Physik, University of Basel, CH-4056, Basel, Switzerland
    M. Dieterle, I. Keshelashvili, B. Krusche, M. Oberle, D. Werthmueller & L. Witthauer
  13. Mount Allison University, E4L3B5, Sackville, New Brunswick, Canada
    D. Hornidge & D. G. Middleton
  14. Institute for Nuclear Research, 125047, Moscow, Russia
    R. Kondratiev, V. Lisin & A. Polonski
  15. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    M. Korolija & I. Supek
  16. The Catholic University of America, DC 20064, Washington, USA
    D. I. Sober

Authors

  1. J. Robinson
  2. I. J. D. MacGregor
  3. J. R. M. Annand
  4. P. Aguar-Bartolomé
  5. L. K. Akasoy
  6. H. J. Arends
  7. Ya. I. Azimov
  8. K. Bantawa
  9. R. Beck
  10. V. S. Bekrenev
  11. H. Berghäuser
  12. A. Braghieri
  13. D. Branford
  14. W. J. Briscoe
  15. J. Brudvik
  16. S. Cherepnya
  17. R. F. B. Codling
  18. B. T. Demissie
  19. M. Dieterle
  20. E. J. Downie
  21. P. Drexler
  22. L. V. Fil’kov
  23. D. I. Glazier
  24. R. Gregor
  25. D. Hamilton
  26. E. Heid
  27. D. Hornidge
  28. D. Howdle
  29. O. Jahn
  30. T. C. Jude
  31. V. L. Kashevarov
  32. I. Keshelashvili
  33. R. Kondratiev
  34. M. Korolija
  35. M. Kotulla
  36. A. A. Koulbardis
  37. S. P. Kruglov
  38. B. Krusche
  39. V. Lisin
  40. K. Livingston
  41. D. M. Manley
  42. J. C. McGeorge
  43. E. F. McNicoll
  44. V. Metag
  45. D. G. Middleton
  46. A. Mushkarenkov
  47. B. M. K. Nefkens
  48. A. Nikolaev
  49. R. Novotny
  50. M. Oberle
  51. M. Ostrick
  52. R. O. Owens
  53. P. B. Otte
  54. B. Oussena
  55. P. Pedroni
  56. A. Polonski
  57. S. Prakhov
  58. G. Rosner
  59. T. Rostomyan
  60. S. Schumann
  61. M. H. Sikora
  62. D. I. Sober
  63. A. Starostin
  64. I. I. Strakovsky
  65. I. M. Suarez
  66. I. Supek
  67. C. M. Tarbert
  68. M. Thiel
  69. A. Thomas
  70. M. Unverzagt
  71. D. P. Watts
  72. D. Werthmueller
  73. L. Witthauer

Consortia

The Crystal Ball at MAMI and A2 Collaborations

Corresponding author

Correspondence toI. J. D. MacGregor.

Additional information

Communicated by P. Rossi

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The Crystal Ball at MAMI and A2 Collaborations., Robinson, J., MacGregor, I.J.D. et al. Measurements of 12C\((\vec{\gamma},pp)\) photon asymmetries for \(E_{\gamma}=200\)–450 MeV.Eur. Phys. J. A 49, 65 (2013). https://doi.org/10.1140/epja/i2013-13065-0

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