Bibcode
Mandaglio, G.; Bellini, V.; Bocquet, J. P.; Casano, L.; D'Angelo, A.; di Salvo, R.; Fantini, A.; Franco, D.; Gervino, G.; Ghio, F.; Giardina, G.; Girolami, B.; Giusa, A.; Ignatov, A. S.; Lapik, A. M.; Levi Sandri, P.; Lleres, A.; Mammoliti, F.; Manganaro, M.; Moricciani, D.; Mushkarenkov, A. N.; Nedorezov, V. G.; Randieri, C.; Rebreyend, D.; Rudnev, N. V.; Russo, G.; Schaerf, C.; Sperduto, M. L.; Sutera, M. C.; Turinge, A.; Vegna, V.
Referencia bibliográfica
International Journal of Modern Physics E, Volume 19, Issue 05-06, pp. 965-976 (2010).
Fecha de publicación:
2010
Número de citas
1
Número de citas referidas
1
Descripción
We present the analysis of data performed in order to identify the
events of the γ + n → π- + p reaction obtained
by bombarding a liquid Deuterium target with a polarised γ beam of
0.55-1.5 GeV at the Graal-experiment. We show the effect of different
kinematic and hardware constraints used to reduce the contamination
coming from the concurrent reaction channels. By the simulation we
estimate the contamination degree due to the other reaction channels so
we can test the reliability of our method. We describe a new
three-dimensional cut based on the Fermi momentum reconstruction and its
effect on the suppression of the concurrent double charged pion
photoproduction. We present the preliminary beam asymmetry Σ of
the π- fotoproduction off quasi-free neutron up to about
θc.m., π- = 165° together with some theoretical
multipolar analysis. For a comparison we also report the data present in
literature on the same reaction for Eγ =850-1740 MeV
and θc.m., π- ≤105°.