Measurements of C-12((gamma)over-right-arrow, pp) photon asymmetries for E-gamma=200-450 MeV

Crystal Ball MAMI Collaboration; Crystal Ball A2 Collaboration; J. Robinson; I. J. D. MacGregor; J. R. M. Annand; P. Aguar-Bartolome; L. K. Akasoy; H. J. Arends; Ya. I. Azimov; K. Bantawa; R. Beck; V. S. Bekrenev; H. Berghaeuser; A. Braghieri; D. Branford; W. J. Briscoe; J. Brudvik; S. Cherepnya; R. F. B. Codling; B. T. Demissie; M. Dieterle; E. J. Downie; P. Drexler; L. V. Fil'kov; D. I. Glazier; R. Gregor; D. Hamilton; E. Heid; D. Hornidge; D. Howdle; O. Jahn; T. C. Jude; V. L. Kashevarov; I. Keshelashvili; R. Kondratiev; M. Korolija; M. Kotulla; A. A. Koulbardis; S. P. Kruglov; B. Krusche; V. Lisin; K. Livingston; D. M. Manley; J. C. McGeorge; E. F. McNicoll; V. Metag; D. G. Middleton; A. Mushkarenkov; B. M. K. Nefkens; A. Nikolaev; R. Novotny; D. P. Watts

doi:10.1140/epja/i2013-13065-0

Measurements of C-12((gamma)over-right-arrow, pp) photon asymmetries for E-gamma=200-450 MeV

Crystal Ball MAMI Collaboration, Crystal Ball A2 Collaboration, J. Robinson^*, I. J. D. MacGregor, J. R. M. Annand, P. Aguar-Bartolome, L. K. Akasoy, H. J. Arends, Ya. I. Azimov, K. Bantawa, R. Beck, V. S. Bekrenev, H. Berghaeuser, A. Braghieri, D. Branford, W. J. Briscoe, J. Brudvik, S. Cherepnya, R. F. B. Codling, B. T. DemissieM. Dieterle, E. J. Downie, P. Drexler, L. V. Fil'kov, D. I. Glazier, R. Gregor, D. Hamilton, E. Heid, D. Hornidge, D. Howdle, O. Jahn, T. C. Jude, V. L. Kashevarov, I. Keshelashvili, R. Kondratiev, M. Korolija, M. Kotulla, A. A. Koulbardis, S. P. Kruglov, B. Krusche, V. Lisin, K. Livingston, D. M. Manley, J. C. McGeorge, E. F. McNicoll, V. Metag, D. G. Middleton, A. Mushkarenkov, B. M. K. Nefkens, A. Nikolaev, R. Novotny, D. P. Watts

^*Corresponding author for this work

School of Physics and Astronomy

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Abstract / Description of output

The C-12((gamma) over right arrow, 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.

Original language	English
Article number	65
Number of pages	9
Journal	The European Physical Journal A (EPJ A)
Volume	49
Issue number	5
DOIs	https://doi.org/10.1140/epja/i2013-13065-0
Publication status	Published - May 2013

Keywords / Materials (for Non-textual outputs)

LINEARLY POLARIZED PHOTONS
COHERENT BREMSSTRAHLUNG
INTERMEDIATE ENERGIES
ANGULAR-DISTRIBUTION
2-NUCLEON KNOCKOUT
FINAL-STATES
SPECTROMETER
ABSORPTION
MECHANISMS
MAINZ

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Crystal Ball MAMI Collaboration, Crystal Ball A2 Collaboration, Robinson, J., MacGregor, I. J. D., Annand, J. R. M., Aguar-Bartolome, P., Akasoy, L. K., Arends, H. J., Azimov, Y. I., Bantawa, K., Beck, R., Bekrenev, V. S., Berghaeuser, H., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., ... Watts, D. P. (2013). Measurements of C-12((gamma)over-right-arrow, pp) photon asymmetries for E-gamma=200-450 MeV. The European Physical Journal A (EPJ A), 49(5), Article 65. https://doi.org/10.1140/epja/i2013-13065-0

@article{204b69d080404a5e9fe46f4a7fdb7620,

title = "Measurements of C-12((gamma)over-right-arrow, pp) photon asymmetries for E-gamma=200-450 MeV",

abstract = "The C-12((gamma) over right arrow, 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.",

keywords = "LINEARLY POLARIZED PHOTONS, COHERENT BREMSSTRAHLUNG, INTERMEDIATE ENERGIES, ANGULAR-DISTRIBUTION, 2-NUCLEON KNOCKOUT, FINAL-STATES, SPECTROMETER, ABSORPTION, MECHANISMS, MAINZ",

author = "{Crystal Ball MAMI Collaboration} and {Crystal Ball A2 Collaboration} and J. Robinson and MacGregor, {I. J. D.} and Annand, {J. R. M.} and P. Aguar-Bartolome and Akasoy, {L. K.} and Arends, {H. J.} and Azimov, {Ya. I.} and K. Bantawa and R. Beck and Bekrenev, {V. S.} and H. Berghaeuser and A. Braghieri and D. Branford and Briscoe, {W. J.} and J. Brudvik and S. Cherepnya and Codling, {R. F. B.} and Demissie, {B. T.} and M. Dieterle and Downie, {E. J.} and P. Drexler and Fil'kov, {L. V.} and Glazier, {D. I.} and R. Gregor and D. Hamilton and E. Heid and D. Hornidge and D. Howdle and O. Jahn and Jude, {T. C.} and Kashevarov, {V. L.} and I. Keshelashvili and R. Kondratiev and M. Korolija and M. Kotulla and Koulbardis, {A. A.} and Kruglov, {S. P.} and B. Krusche and V. Lisin and K. Livingston and Manley, {D. M.} and McGeorge, {J. C.} and McNicoll, {E. F.} and V. Metag and Middleton, {D. G.} and A. Mushkarenkov and Nefkens, {B. M. K.} and A. Nikolaev and R. Novotny and Watts, {D. P.}",

year = "2013",

month = may,

doi = "10.1140/epja/i2013-13065-0",

language = "English",

volume = "49",

journal = "The European Physical Journal A (EPJ A)",

issn = "1434-6001",

publisher = "Springer",

number = "5",

}

Crystal Ball MAMI Collaboration, Crystal Ball A2 Collaboration, Robinson, J, MacGregor, IJD, Annand, JRM, Aguar-Bartolome, P, Akasoy, LK, Arends, HJ, Azimov, YI, Bantawa, K, Beck, R, Bekrenev, VS, Berghaeuser, H, Braghieri, A, Branford, D, Briscoe, WJ, Brudvik, J, Cherepnya, S, Codling, RFB, Demissie, BT, Dieterle, M, Downie, EJ, Drexler, P, Fil'kov, LV, Glazier, DI, Gregor, R, Hamilton, D, Heid, E, Hornidge, D, Howdle, D, Jahn, O, Jude, TC, Kashevarov, VL, Keshelashvili, I, Kondratiev, R, Korolija, M, Kotulla, M, Koulbardis, AA, Kruglov, SP, Krusche, B, Lisin, V, Livingston, K, Manley, DM, McGeorge, JC, McNicoll, EF, Metag, V, Middleton, DG, Mushkarenkov, A, Nefkens, BMK, Nikolaev, A, Novotny, R & Watts, DP 2013, 'Measurements of C-12((gamma)over-right-arrow, pp) photon asymmetries for E-gamma=200-450 MeV', The European Physical Journal A (EPJ A), vol. 49, no. 5, 65. https://doi.org/10.1140/epja/i2013-13065-0

TY - JOUR

T1 - Measurements of C-12((gamma)over-right-arrow, pp) photon asymmetries for E-gamma=200-450 MeV

AU - Crystal Ball MAMI Collaboration

AU - Crystal Ball A2 Collaboration

AU - Robinson, J.

AU - MacGregor, I. J. D.

AU - Annand, J. R. M.

AU - Aguar-Bartolome, P.

AU - Akasoy, L. K.

AU - Arends, H. J.

AU - Azimov, Ya. I.

AU - Bantawa, K.

AU - Beck, R.

AU - Bekrenev, V. S.

AU - Berghaeuser, H.

AU - Braghieri, A.

AU - Branford, D.

AU - Briscoe, W. J.

AU - Brudvik, J.

AU - Cherepnya, S.

AU - Codling, R. F. B.

AU - Demissie, B. T.

AU - Dieterle, M.

AU - Downie, E. J.

AU - Drexler, P.

AU - Fil'kov, L. V.

AU - Glazier, D. I.

AU - Gregor, R.

AU - Hamilton, D.

AU - Heid, E.

AU - Hornidge, D.

AU - Howdle, D.

AU - Jahn, O.

AU - Jude, T. C.

AU - Kashevarov, V. L.

AU - Keshelashvili, I.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Kotulla, M.

AU - Koulbardis, A. A.

AU - Kruglov, S. P.

AU - Krusche, B.

AU - Lisin, V.

AU - Livingston, K.

AU - Manley, D. M.

AU - McGeorge, J. C.

AU - McNicoll, E. F.

AU - Metag, V.

AU - Middleton, D. G.

AU - Mushkarenkov, A.

AU - Nefkens, B. M. K.

AU - Nikolaev, A.

AU - Novotny, R.

AU - Watts, D. P.

PY - 2013/5

Y1 - 2013/5

N2 - The C-12((gamma) over right arrow, 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.

AB - The C-12((gamma) over right arrow, 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.

KW - LINEARLY POLARIZED PHOTONS

KW - COHERENT BREMSSTRAHLUNG

KW - INTERMEDIATE ENERGIES

KW - ANGULAR-DISTRIBUTION

KW - 2-NUCLEON KNOCKOUT

KW - FINAL-STATES

KW - SPECTROMETER

KW - ABSORPTION

KW - MECHANISMS

KW - MAINZ

U2 - 10.1140/epja/i2013-13065-0

DO - 10.1140/epja/i2013-13065-0

M3 - Article

SN - 1434-6001

VL - 49

JO - The European Physical Journal A (EPJ A)

JF - The European Physical Journal A (EPJ A)

IS - 5

M1 - 65

ER -

Measurements of C-12((gamma)over-right-arrow, pp) photon asymmetries for E-gamma=200-450 MeV

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

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