Journal article
Authors list: Nanova, M.; Friedrich, S.; Metag, V.; Paryev, E. Ya.; Afzal, F. N.; Bayadilov, D.; Bantes, B.; Beck, R.; Becker, M.; Boese, S.; Brinkmann, K-T.; Crede, V.; Drexler, P.; Eberhardt, H.; Elsner, D.; Frommberger, F.; Funke, Ch.; Gottschall, M.; Gruener, M.; Gutz, E.; Hammann, Ch.; Hannappel, J.; Hartmann, J.; Hillert, W.; Hoffmeister, Ph.; Honisch, Ch.; Jude, T.; Kaiser, D.; Kalischewski, F.; Keshelashvili, I.; Klein, F.; Koop, K.; Krusche, B.; Lang, M.; Makonyi, K.; Messi, F.; Mueller, J.; Muellers, J.; Piontek, D.; Rostomyan, T.; Schaab, D.; Schmidt, Ch.; Schmieden, H.; Schmitz, R.; Seifen, T.; Sokhoyan, V.; Sowa, C.; Spieker, K.; Thiel, A.; Thoma, U.; Triffterer, T.; Urban, M.; van Pee, H.; Walther, D.; Wendel, Ch.; Werthmueller, D.; Wiedner, U.; Wilson, A.; Witthauer, L.; Wunderlich, Y.; Zaunick, H-G.
Publication year: 2018
Journal: The European Physical Journal A
Volume number: 54
Issue number: 10
ISSN: 1434-6001
eISSN: 1434-601X
DOI Link: https://doi.org/10.1140/epja/i2018-12639-6
Publisher: Springer
Abstract:
The production of. eta mesons in coincidence with forward-going protons has been studied in photon-induced reactions on C-12 and on a liquid hydrogen (LH2) target for incoming photon energies of 1.3-2.6 GeV at the electron accelerator ELSA. The. eta mesons have been identified via the. eta. pi(0) pi(0) -> 6 gamma decay registered with the CBELSA/ TAPS detector system. Coincident protons have been identified in the MiniTAPS BaF2 array at polar angles of 2 degrees <= theta(p) <= 11 degrees. Under these kinematic constraints the. eta mesons are produced with relatively low kinetic energy (approximate to 150MeV) since the coincident protons take over most of the momentum of the incident-photon beam. For the C-target this allows the determination of the real part of the eta -carbon potential at low meson momenta by comparing with collision model calculations of the. eta kinetic energy distribution and excitation function. Fitting the latter data for. similar to mesons going backwards in the center-of-mass system yields a potential depth of V = -(44 +/- 16(stat) +/- 15(syst)) MeV, consistent with earlier determinations of the potential depth in inclusive measurements for average. eta momenta of approximate to 1.1 GeV/ c. Within the experimental uncertainties, there is no indication of a momentum dependence of the. eta -carbon potential. The LH2 data, taken as a reference to check the data analysis and the model calculations, provide differential and integral cross sections in good agreement with previous results for. eta photoproduction off the free proton.
Citation Styles
Harvard Citation style: Nanova, M., Friedrich, S., Metag, V., Paryev, E., Afzal, F., Bayadilov, D., et al. (2018) The η -carbon potential at low meson momenta, The European Physical Journal A, 54(10). https://doi.org/10.1140/epja/i2018-12639-6
APA Citation style: Nanova, M., Friedrich, S., Metag, V., Paryev, E., Afzal, F., Bayadilov, D., Bantes, B., Beck, R., Becker, M., Boese, S., Brinkmann, K., Crede, V., Drexler, P., Eberhardt, H., Elsner, D., Frommberger, F., Funke, C., Gottschall, M., Gruener, M., ...Zaunick, H. (2018). The η -carbon potential at low meson momenta. The European Physical Journal A. 54(10). https://doi.org/10.1140/epja/i2018-12639-6
Keywords
PROTON-NUCLEUS REACTIONS
