Helicity dependence of the γ 3He → πX reactions in the Δ(1232) resonance region

S. Costanza, A. Mushkarenkov, F. Rigamonti, M. Romaniuk, P. Aguar Bartolomé, J. Ahrens, J. R M Annand, H. J. Arends, R. Beck, A. Braghieri, V. Bekrenev, H. Berghäuser, W. J. Briscoe, S. N. Cherepnya, C. Collicott, E. J. Downie, P. Drexler, L. V. Fil’kov, A. Fix, D. I. Glazier & 48 others D. Hamilton, E. Heid, W. Heil, D. Hornidge, D. Howdle, I. Jaegle, G. M. Huber, O. Jahn, T. Jude, V. L. Kashevarov, I. Keshelashvili, R. Kondratiev, M. Korolija, J. Krimmer, B. Krusche, S. Kruglov, A. Kulbardis, V. Lisin, K. Livingston, I. J D MacGregor, J. Mancell, G. Mandaglio, D. M. Manley, J. C. McGeorge, D. G. Middleton, V. Metag, B. M K Nefkens, A. Nikolaev, M. Oberle, M. Ostrick, H. Ortega, P. B. Otte, B. Oussena, P. Pedroni, F. Pheron, A. Polonski, S. Prakhov, G. Rosner, T. Rostomyan, A. J. Sarty, S. Schumann, A. Starostin, I. Supek, M. Thiel, A. Thomas, M. Unverzagt, D. P. Watts, D. Werthmüller

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The helicity dependences of the differential cross sections for the semi-inclusive γ3He → π0X and γ3He → π±X reactions have been measured for the first time in the energy region 200 < Eγ 450 MeV. The experiment was performed at the tagged photon beam facility of the MAMI accelerator in Mainz using a longitudinally polarised high-pressure 3He gas target. Hadronic products were measured with the large-acceptance Crystal Ball detector complemented with additional devices for charged-particle tracking and identification. Unpolarised differential cross sections and their helicity dependence are compared with theoretical calculations using the Fix-Arenhövel model. The effect of the intermediate excitation of the Δ(1232) resonance can be clearly seen from this comparison, especially for the polarised case, where nuclear effects are relatively small. The model provides a better theoretical description of the unpolarised charged pion photoproduction data than the neutral pion channel. It does significantly better in describing the helicity-dependent data in both channels. These comparisons provide new information on the mechanisms involved in pion photoproduction on 3He and suggest that a polarised 3He target can provide valuable information on the corresponding polarised quasi-free neutron reactions.

Original languageEnglish
JournalEuropean Physical Journal A
Volume50
Issue number11
DOIs
Publication statusPublished - 2014

Fingerprint

pions
photoproduction
cross sections
photon beams
acceptability
fixing
balls
charged particles
accelerators
neutrons
detectors
products
gases
excitation
crystals
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Costanza, S., Mushkarenkov, A., Rigamonti, F., Romaniuk, M., Aguar Bartolomé, P., Ahrens, J., ... Werthmüller, D. (2014). Helicity dependence of the γ 3He → πX reactions in the Δ(1232) resonance region. European Physical Journal A, 50(11). https://doi.org/10.1140/epja/i2014-14173-y

Helicity dependence of the γ 3He → πX reactions in the Δ(1232) resonance region. / Costanza, S.; Mushkarenkov, A.; Rigamonti, F.; Romaniuk, M.; Aguar Bartolomé, P.; Ahrens, J.; Annand, J. R M; Arends, H. J.; Beck, R.; Braghieri, A.; Bekrenev, V.; Berghäuser, H.; Briscoe, W. J.; Cherepnya, S. N.; Collicott, C.; Downie, E. J.; Drexler, P.; Fil’kov, L. V.; Fix, A.; Glazier, D. I.; Hamilton, D.; Heid, E.; Heil, W.; Hornidge, D.; Howdle, D.; Jaegle, I.; Huber, G. M.; Jahn, O.; Jude, T.; Kashevarov, V. L.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krimmer, J.; Krusche, B.; Kruglov, S.; Kulbardis, A.; Lisin, V.; Livingston, K.; MacGregor, I. J D; Mancell, J.; Mandaglio, G.; Manley, D. M.; McGeorge, J. C.; Middleton, D. G.; Metag, V.; Nefkens, B. M K; Nikolaev, A.; Oberle, M.; Ostrick, M.; Ortega, H.; Otte, P. B.; Oussena, B.; Pedroni, P.; Pheron, F.; Polonski, A.; Prakhov, S.; Rosner, G.; Rostomyan, T.; Sarty, A. J.; Schumann, S.; Starostin, A.; Supek, I.; Thiel, M.; Thomas, A.; Unverzagt, M.; Watts, D. P.; Werthmüller, D.

In: European Physical Journal A, Vol. 50, No. 11, 2014.

Research output: Contribution to journalArticle

Costanza, S, Mushkarenkov, A, Rigamonti, F, Romaniuk, M, Aguar Bartolomé, P, Ahrens, J, Annand, JRM, Arends, HJ, Beck, R, Braghieri, A, Bekrenev, V, Berghäuser, H, Briscoe, WJ, Cherepnya, SN, Collicott, C, Downie, EJ, Drexler, P, Fil’kov, LV, Fix, A, Glazier, DI, Hamilton, D, Heid, E, Heil, W, Hornidge, D, Howdle, D, Jaegle, I, Huber, GM, Jahn, O, Jude, T, Kashevarov, VL, Keshelashvili, I, Kondratiev, R, Korolija, M, Krimmer, J, Krusche, B, Kruglov, S, Kulbardis, A, Lisin, V, Livingston, K, MacGregor, IJD, Mancell, J, Mandaglio, G, Manley, DM, McGeorge, JC, Middleton, DG, Metag, V, Nefkens, BMK, Nikolaev, A, Oberle, M, Ostrick, M, Ortega, H, Otte, PB, Oussena, B, Pedroni, P, Pheron, F, Polonski, A, Prakhov, S, Rosner, G, Rostomyan, T, Sarty, AJ, Schumann, S, Starostin, A, Supek, I, Thiel, M, Thomas, A, Unverzagt, M, Watts, DP & Werthmüller, D 2014, 'Helicity dependence of the γ 3He → πX reactions in the Δ(1232) resonance region', European Physical Journal A, vol. 50, no. 11. https://doi.org/10.1140/epja/i2014-14173-y
Costanza S, Mushkarenkov A, Rigamonti F, Romaniuk M, Aguar Bartolomé P, Ahrens J et al. Helicity dependence of the γ 3He → πX reactions in the Δ(1232) resonance region. European Physical Journal A. 2014;50(11). https://doi.org/10.1140/epja/i2014-14173-y
Costanza, S. ; Mushkarenkov, A. ; Rigamonti, F. ; Romaniuk, M. ; Aguar Bartolomé, P. ; Ahrens, J. ; Annand, J. R M ; Arends, H. J. ; Beck, R. ; Braghieri, A. ; Bekrenev, V. ; Berghäuser, H. ; Briscoe, W. J. ; Cherepnya, S. N. ; Collicott, C. ; Downie, E. J. ; Drexler, P. ; Fil’kov, L. V. ; Fix, A. ; Glazier, D. I. ; Hamilton, D. ; Heid, E. ; Heil, W. ; Hornidge, D. ; Howdle, D. ; Jaegle, I. ; Huber, G. M. ; Jahn, O. ; Jude, T. ; Kashevarov, V. L. ; Keshelashvili, I. ; Kondratiev, R. ; Korolija, M. ; Krimmer, J. ; Krusche, B. ; Kruglov, S. ; Kulbardis, A. ; Lisin, V. ; Livingston, K. ; MacGregor, I. J D ; Mancell, J. ; Mandaglio, G. ; Manley, D. M. ; McGeorge, J. C. ; Middleton, D. G. ; Metag, V. ; Nefkens, B. M K ; Nikolaev, A. ; Oberle, M. ; Ostrick, M. ; Ortega, H. ; Otte, P. B. ; Oussena, B. ; Pedroni, P. ; Pheron, F. ; Polonski, A. ; Prakhov, S. ; Rosner, G. ; Rostomyan, T. ; Sarty, A. J. ; Schumann, S. ; Starostin, A. ; Supek, I. ; Thiel, M. ; Thomas, A. ; Unverzagt, M. ; Watts, D. P. ; Werthmüller, D. / Helicity dependence of the γ 3He → πX reactions in the Δ(1232) resonance region. In: European Physical Journal A. 2014 ; Vol. 50, No. 11.
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abstract = "The helicity dependences of the differential cross sections for the semi-inclusive γ3He → π0X and γ3He → π±X reactions have been measured for the first time in the energy region 200 < Eγ 450 MeV. The experiment was performed at the tagged photon beam facility of the MAMI accelerator in Mainz using a longitudinally polarised high-pressure 3He gas target. Hadronic products were measured with the large-acceptance Crystal Ball detector complemented with additional devices for charged-particle tracking and identification. Unpolarised differential cross sections and their helicity dependence are compared with theoretical calculations using the Fix-Arenh{\"o}vel model. The effect of the intermediate excitation of the Δ(1232) resonance can be clearly seen from this comparison, especially for the polarised case, where nuclear effects are relatively small. The model provides a better theoretical description of the unpolarised charged pion photoproduction data than the neutral pion channel. It does significantly better in describing the helicity-dependent data in both channels. These comparisons provide new information on the mechanisms involved in pion photoproduction on 3He and suggest that a polarised 3He target can provide valuable information on the corresponding polarised quasi-free neutron reactions.",
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TY - JOUR

T1 - Helicity dependence of the γ 3He → πX reactions in the Δ(1232) resonance region

AU - Costanza, S.

AU - Mushkarenkov, A.

AU - Rigamonti, F.

AU - Romaniuk, M.

AU - Aguar Bartolomé, P.

AU - Ahrens, J.

AU - Annand, J. R M

AU - Arends, H. J.

AU - Beck, R.

AU - Braghieri, A.

AU - Bekrenev, V.

AU - Berghäuser, H.

AU - Briscoe, W. J.

AU - Cherepnya, S. N.

AU - Collicott, C.

AU - Downie, E. J.

AU - Drexler, P.

AU - Fil’kov, L. V.

AU - Fix, A.

AU - Glazier, D. I.

AU - Hamilton, D.

AU - Heid, E.

AU - Heil, W.

AU - Hornidge, D.

AU - Howdle, D.

AU - Jaegle, I.

AU - Huber, G. M.

AU - Jahn, O.

AU - Jude, T.

AU - Kashevarov, V. L.

AU - Keshelashvili, I.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Krimmer, J.

AU - Krusche, B.

AU - Kruglov, S.

AU - Kulbardis, A.

AU - Lisin, V.

AU - Livingston, K.

AU - MacGregor, I. J D

AU - Mancell, J.

AU - Mandaglio, G.

AU - Manley, D. M.

AU - McGeorge, J. C.

AU - Middleton, D. G.

AU - Metag, V.

AU - Nefkens, B. M K

AU - Nikolaev, A.

AU - Oberle, M.

AU - Ostrick, M.

AU - Ortega, H.

AU - Otte, P. B.

AU - Oussena, B.

AU - Pedroni, P.

AU - Pheron, F.

AU - Polonski, A.

AU - Prakhov, S.

AU - Rosner, G.

AU - Rostomyan, T.

AU - Sarty, A. J.

AU - Schumann, S.

AU - Starostin, A.

AU - Supek, I.

AU - Thiel, M.

AU - Thomas, A.

AU - Unverzagt, M.

AU - Watts, D. P.

AU - Werthmüller, D.

PY - 2014

Y1 - 2014

N2 - The helicity dependences of the differential cross sections for the semi-inclusive γ3He → π0X and γ3He → π±X reactions have been measured for the first time in the energy region 200 < Eγ 450 MeV. The experiment was performed at the tagged photon beam facility of the MAMI accelerator in Mainz using a longitudinally polarised high-pressure 3He gas target. Hadronic products were measured with the large-acceptance Crystal Ball detector complemented with additional devices for charged-particle tracking and identification. Unpolarised differential cross sections and their helicity dependence are compared with theoretical calculations using the Fix-Arenhövel model. The effect of the intermediate excitation of the Δ(1232) resonance can be clearly seen from this comparison, especially for the polarised case, where nuclear effects are relatively small. The model provides a better theoretical description of the unpolarised charged pion photoproduction data than the neutral pion channel. It does significantly better in describing the helicity-dependent data in both channels. These comparisons provide new information on the mechanisms involved in pion photoproduction on 3He and suggest that a polarised 3He target can provide valuable information on the corresponding polarised quasi-free neutron reactions.

AB - The helicity dependences of the differential cross sections for the semi-inclusive γ3He → π0X and γ3He → π±X reactions have been measured for the first time in the energy region 200 < Eγ 450 MeV. The experiment was performed at the tagged photon beam facility of the MAMI accelerator in Mainz using a longitudinally polarised high-pressure 3He gas target. Hadronic products were measured with the large-acceptance Crystal Ball detector complemented with additional devices for charged-particle tracking and identification. Unpolarised differential cross sections and their helicity dependence are compared with theoretical calculations using the Fix-Arenhövel model. The effect of the intermediate excitation of the Δ(1232) resonance can be clearly seen from this comparison, especially for the polarised case, where nuclear effects are relatively small. The model provides a better theoretical description of the unpolarised charged pion photoproduction data than the neutral pion channel. It does significantly better in describing the helicity-dependent data in both channels. These comparisons provide new information on the mechanisms involved in pion photoproduction on 3He and suggest that a polarised 3He target can provide valuable information on the corresponding polarised quasi-free neutron reactions.

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U2 - 10.1140/epja/i2014-14173-y

DO - 10.1140/epja/i2014-14173-y

M3 - Article

VL - 50

JO - Zeitschrift fur Physik A Hadrons and Nuclei

JF - Zeitschrift fur Physik A Hadrons and Nuclei

SN - 0939-7922

IS - 11

ER -