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Pregled bibliografske jedinice broj: 1060471

Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions

(A2 Collaboration at MAMI) Dieterle, M.; Werthmüller, D.; Abt, S.; Afzal, F.; Aguar Bartolome, P.; Ahmed, Z.; Ahrens, J.; Annand, J. R. M.; Arends, H. J.; Bashkanov, M. et al.
Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions // Physical review. C, 97 (2018), 6; 065205, 30 doi:10.1103/physrevc.97.065205 (međunarodna recenzija, članak, znanstveni)

CROSBI ID: 1060471 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions

Autori
Dieterle, M. ; Werthmüller, D. ; Abt, S. ; Afzal, F. ; Aguar Bartolome, P. ; Ahmed, Z. ; Ahrens, J. ; Annand, J. R. M. ; Arends, H. J. ; Bashkanov, M. ; Beck, R. ; Biroth, M. ; Borisov, N. ; Braghieri, A. ; Briscoe, W. J. ; Cherepnya, S. ; Cividini, F. ; Collicott, C. ; Costanza, S. ; Denig, A. ; Downie, E. J. ; Drexler, P. ; Fil'kov, L. V. ; Garni, S. ; Glazier, D. I. ; Gorodnov, I. ; Gradl, W. ; Günther, M. ; Gurevich, D. ; Heijkenskjöld, L. ; Hornidge, D. ; Huber, G. M. ; Käser, A. ; Kashevarov, V. L. ; Kay, S. ; Keshelashvili, I. ; Kondratiev, R. ; Korolija, Milorad ; Krusche, B. ; Lazarev, A. ; Lisin, V. ; Livingston, K. ; Lutterer, S. ; MacGregor, I. J. D. ; Manley, D. M. ; Martel, P. P. ; McGeorge, J. C. ; Metag, V. ; Middleton, D. G. ; Miskimen, R. ; Mornacchi, E. ; Mushkarenkov, A. ; Neganov, A. ; Neiser, A. ; Oberle, M. ; Ostrick, M. ; Otte, P. B. ; Oussena, B. ; Paudyal, D. ; Pedroni, P. ; Polonski, A. ; Prakhov, S. N. ; Ron, G. ; Rostomyan, T. ; Sarty, A. ; Sfienti, C. ; Sokhoyan, V. ; Spieker, K. ; Steffen, O. ; Strakovsky, I. I. ; Strub, T. ; Supek, Ivan ; Thiel, A. ; Thiel, M. ; Thomas, A. ; Unverzagt, M. ; Usov, Yu. A. ; Wagner, S. ; Walford, N. K. ; Watts, D. P. ; Wettig, J. ; Witthauer, L. ; Wolfes, M. ; Zana, L. A.

Kolaboracija
A2 Collaboration at MAMI

Izvornik
Physical review. C (2469-9985) 97 (2018), 6; 065205, 30

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
tagged photon spectrometer ; polarization observable E ; cross-sections ; pion-photoproduction ; baryon resonances ; deuteron ; MAMI ; asymmetry ; microtron ; threshold

Sažetak
Background: Photoproduction of mesons off quasifree nucleons bound in the deuteron allows us to study the electromagnetic excitation spectrum of the neutron and the isospin structure of the excitation of nucleon resonances. The database for such reactions is much more sparse than for free proton targets. Purpose: Study experimentally single pi(0) photoproduction off quasifree nucleons from the deuteron. Investigate nuclear effects by a comparison of the results for free protons and quasifree protons. Use the quasifree neutron data (corrected for nuclear effects) to test the predictions of reaction models and partial wave analysis (PWA) for gamma n -> n pi(0) derived from the analysis of the other isospin channels. Methods: High statistics angular distributions and total cross sections for the photoproduction of pi(0) mesons off the deuteron with coincident detection of recoil nucleons have been measured for the first time. The experiment was performed at the tagged photon beam of the Mainz Microtron (MAMI) accelerator for photon energies between 0.45 and 1.4 GeV, using an almost 4 pi electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. A complete kinematic reconstruction of the final state removed the effects of Fermi motion. Results: Significant effects from final-state interactions (FSI) were observed for participant protons in comparison to free proton targets (between 30% and almost 40%). The data in coincidence with recoil neutrons were corrected for such effects under the assumption that they are identical for participant protons and neutrons. Reaction model predictions and PWA for gamma n -> n pi(0), based on fits to data for the other isospin channels, disagreed between themselves and no model provided a good description of the new data. Conclusions: The results demonstrate clearly the importance of a measurement of the fully neutral final state for the isospin decomposition of the cross section. Model refits, for example from the Bonn-Gatchina analysis, show that the new and the previous data for the other three isospin channels can be simultaneously described when the contributions of several partial waves are modified. The results are also relevant for the suppression of the higher resonance bumps in total photoabsorption on nuclei, which are not well understood.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA

Ustanove:
Institut "Ruđer Bošković", Zagreb

Profili:

Avatar Url Ivan Supek (autor)

Avatar Url Milorad Korolija (autor)

Poveznice na cjeloviti tekst rada:

doi journals.aps.org doi.org

Citiraj ovu publikaciju:

(A2 Collaboration at MAMI) Dieterle, M.; Werthmüller, D.; Abt, S.; Afzal, F.; Aguar Bartolome, P.; Ahmed, Z.; Ahrens, J.; Annand, J. R. M.; Arends, H. J.; Bashkanov, M. et al.
Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions // Physical review. C, 97 (2018), 6; 065205, 30 doi:10.1103/physrevc.97.065205 (međunarodna recenzija, članak, znanstveni)
(A2 Collaboration at MAMI) (A2 Collaboration at MAMI) Dieterle, M., Werthmüller, D., Abt, S., Afzal, F., Aguar Bartolome, P., Ahmed, Z., Ahrens, J., Annand, J., Arends, H. & Bashkanov, M. (2018) Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions. Physical review. C, 97 (6), 065205, 30 doi:10.1103/physrevc.97.065205.
@article{article, author = {Dieterle, M. and Werthm\"{u}ller, D. and Abt, S. and Afzal, F. and Aguar Bartolome, P. and Ahmed, Z. and Ahrens, J. and Annand, J. R. M. and Arends, H. J. and Bashkanov, M. and Beck, R. and Biroth, M. and Borisov, N. and Braghieri, A. and Briscoe, W. J. and Cherepnya, S. and Cividini, F. and Collicott, C. and Costanza, S. and Denig, A. and Downie, E. J. and Drexler, P. and Fil'kov, L. V. and Garni, S. and Glazier, D. I. and Gorodnov, I. and Gradl, W. and G\"{u}nther, M. and Gurevich, D. and Heijkenskj\"{o}ld, L. and Hornidge, D. and Huber, G. M. and K\"{a}ser, A. and Kashevarov, V. L. and Kay, S. and Keshelashvili, I. and Kondratiev, R. and Korolija, Milorad and Krusche, B. and Lazarev, A. and Lisin, V. and Livingston, K. and Lutterer, S. and MacGregor, I. J. D. and Manley, D. M. and Martel, P. P. and McGeorge, J. C. and Metag, V. and Middleton, D. G. and Miskimen, R. and Mornacchi, E. and Mushkarenkov, A. and Neganov, A. and Neiser, A. and Oberle, M. and Ostrick, M. and Otte, P. B. and Oussena, B. and Paudyal, D. and Pedroni, P. and Polonski, A. and Prakhov, S. N. and Ron, G. and Rostomyan, T. and Sarty, A. and Sfienti, C. and Sokhoyan, V. and Spieker, K. and Steffen, O. and Strakovsky, I. I. and Strub, T. and Supek, Ivan and Thiel, A. and Thiel, M. and Thomas, A. and Unverzagt, M. and Usov, Yu. A. and Wagner, S. and Walford, N. K. and Watts, D. P. and Wettig, J. and Witthauer, L. and Wolfes, M. and Zana, L. A.}, year = {2018}, pages = {30}, DOI = {10.1103/physrevc.97.065205}, chapter = {065205}, keywords = {tagged photon spectrometer, polarization observable E, cross-sections, pion-photoproduction, baryon resonances, deuteron, MAMI, asymmetry, microtron, threshold}, journal = {Physical review. C}, doi = {10.1103/physrevc.97.065205}, volume = {97}, number = {6}, issn = {2469-9985}, title = {Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions}, keyword = {tagged photon spectrometer, polarization observable E, cross-sections, pion-photoproduction, baryon resonances, deuteron, MAMI, asymmetry, microtron, threshold}, chapternumber = {065205} }
@article{article, author = {Dieterle, M. and Werthm\"{u}ller, D. and Abt, S. and Afzal, F. and Aguar Bartolome, P. and Ahmed, Z. and Ahrens, J. and Annand, J. R. M. and Arends, H. J. and Bashkanov, M. and Beck, R. and Biroth, M. and Borisov, N. and Braghieri, A. and Briscoe, W. J. and Cherepnya, S. and Cividini, F. and Collicott, C. and Costanza, S. and Denig, A. and Downie, E. J. and Drexler, P. and Fil'kov, L. V. and Garni, S. and Glazier, D. I. and Gorodnov, I. and Gradl, W. and G\"{u}nther, M. and Gurevich, D. and Heijkenskj\"{o}ld, L. and Hornidge, D. and Huber, G. M. and K\"{a}ser, A. and Kashevarov, V. L. and Kay, S. and Keshelashvili, I. and Kondratiev, R. and Korolija, Milorad and Krusche, B. and Lazarev, A. and Lisin, V. and Livingston, K. and Lutterer, S. and MacGregor, I. J. D. and Manley, D. M. and Martel, P. P. and McGeorge, J. C. and Metag, V. and Middleton, D. G. and Miskimen, R. and Mornacchi, E. and Mushkarenkov, A. and Neganov, A. and Neiser, A. and Oberle, M. and Ostrick, M. and Otte, P. B. and Oussena, B. and Paudyal, D. and Pedroni, P. and Polonski, A. and Prakhov, S. N. and Ron, G. and Rostomyan, T. and Sarty, A. and Sfienti, C. and Sokhoyan, V. and Spieker, K. and Steffen, O. and Strakovsky, I. I. and Strub, T. and Supek, Ivan and Thiel, A. and Thiel, M. and Thomas, A. and Unverzagt, M. and Usov, Yu. A. and Wagner, S. and Walford, N. K. and Watts, D. P. and Wettig, J. and Witthauer, L. and Wolfes, M. and Zana, L. A.}, year = {2018}, pages = {30}, DOI = {10.1103/physrevc.97.065205}, chapter = {065205}, keywords = {tagged photon spectrometer, polarization observable E, cross-sections, pion-photoproduction, baryon resonances, deuteron, MAMI, asymmetry, microtron, threshold}, journal = {Physical review. C}, doi = {10.1103/physrevc.97.065205}, volume = {97}, number = {6}, issn = {2469-9985}, title = {Photoproduction of π0 mesons off protons and neutrons in the second and third nucleon resonance regions}, keyword = {tagged photon spectrometer, polarization observable E, cross-sections, pion-photoproduction, baryon resonances, deuteron, MAMI, asymmetry, microtron, threshold}, chapternumber = {065205} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus

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