A new measurement of the Pontecorvo reaction with the OBELIX spectrometer at LEAR

Ableev, V. G.; Adamo, A.; Agnello, M.; Balestra, F.; Bendiscioli, G.; Bertin, A.; Boccaccio, P.; Bonazzola, G.; Bressani, T.; Bruschi, M.; Bussa, M. P.; Busso, L.; Calvo, D.; Capponi, M.; Cerello, P.; Cicalò, C.; Corradini, M.; Costa, S.; De Castro, S.; D'Isep, F.; Donzella, A.; Falomkin, I. V.; Fava, L.; Feliciello, A.; Ferrero, L.; Filippi, A.; Filippini, V.; Galli, D.; Garfagnini, R.; Gastaldi, U.; Gianotti, P.; Grasso, A.; Guaraldo, C.; Lazzi, F.; Lanaro, A.; Lodi Rizzini, E.; Lombardi, M.; Lucherini, V.; Maggiora, A.; Maneva, G.; Marcello, S.; Marconi, U.; Margagliotti, Giacomo; Maron, G.; Masoni, A.; Massa, I.; Minetti, B.; Montagna, P.; Morando, M.; Nichitiu, F.; Panzieri, D.; Pauli, G.; Piccinini, M.; Piragino, G.; Poli, M.; Pontecorvo, G. B.; Puddu, G.; Ricci, R. A.; Rossetto, E.; Rotondi, A.; Rozhdestvensky, A. M.; Salvini, P.; Santi, L.; Sapozhnikov, M. G.; Semprini Cesari, N.; Serci, S.; Spighi, R.; Temnikov, P.; Tessaro, S.; Tosello, F.; Tretyak, V. I.; Usai, G.; Vannucci, L.; Vecchi, S.; Vedovato, G.; Venturelli, L.; Villa, M.; Vitale, A.; Zenoni, A.; Zoccoli, A.; Zosi, G.

doi:10.1016/0375-9474(93)90132-H

Antinucleon-nucleus annihilations into two-body final states containing only one or no meson are unusual annihilations (Pontecorvo reactions), practically unexplored experimentally, with the exception of the channel pBAR d --> pi- p, for which only two low-statistics measurements exist. Their physical interest lies in the possibility of exploring small-distance nuclear dynamics, in which an important role can be played by non-nucleonic degrees of freedom. A new measurement of the pBAR d --> pi- p reaction rate at rest, performed with the OBELIX spectrometer at LEAR, with the best statistics up to now and a careful evaluation of systematic effects is reported, together with a critical analysis of the existing theoretical models. The measured branching ratio, which confirms the previous results, can represent a reference point for the studies in the field.

Titolo:	A new measurement of the Pontecorvo reaction with the OBELIX spectrometer at LEAR
Autori:	V. G. Ableev A. Adamo M. Agnello F. Balestra G. Bendiscioli A. Bertin P. Boccaccio G. Bonazzola T. Bressani M. Bruschi M. P. Bussa L. Busso D. Calvo M. Capponi P. Cerello C. Cicalò M. Corradini S. Costa S. De Castro F. D'Isep A. Donzella I. V. Falomkin L. Fava A. Feliciello L. Ferrero A. Filippi V. Filippini D. Galli R. Garfagnini U. Gastaldi P. Gianotti A. Grasso C. Guaraldo F. lazzi A. Lanaro E. Lodi Rizzini M. Lombardi V. Lucherini A. Maggiora G. Maneva S. Marcello U. Marconi MARGAGLIOTTI, GIACOMO G. Maron A. Masoni I. Massa B. Minetti P. Montagna M. Morando F. Nichitiu D. Panzieri G. Pauli M. Piccinini G. Piragino M. Poli G. B. Pontecorvo G. Puddu R. A. Ricci E. Rossetto A. Rotondi A. M. Rozhdestvensky P. Salvini L. Santi M. G. Sapozhnikov N. Semprini Cesari S. Serci R. Spighi P. Temnikov S. Tessaro F. Tosello V. I. Tretyak G. Usai L. Vannucci S. Vecchi G. Vedovato L. Venturelli M. Villa A. Vitale A. Zenoni A. Zoccoli G. Zosi mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	1993
Rivista:	NUCLEAR PHYSICS. A
Abstract:	Antinucleon-nucleus annihilations into two-body final states containing only one or no meson are unusual annihilations (Pontecorvo reactions), practically unexplored experimentally, with the exception of the channel pBAR d --> pi- p, for which only two low-statistics measurements exist. Their physical interest lies in the possibility of exploring small-distance nuclear dynamics, in which an important role can be played by non-nucleonic degrees of freedom. A new measurement of the pBAR d --> pi- p reaction rate at rest, performed with the OBELIX spectrometer at LEAR, with the best statistics up to now and a careful evaluation of systematic effects is reported, together with a critical analysis of the existing theoretical models. The measured branching ratio, which confirms the previous results, can represent a reference point for the studies in the field.
Handle:	http://hdl.handle.net/11368/2634838
Digital Object Identifier (DOI):	http://dx.doi.org/10.1016/0375-9474(93)90132-H
Appare nelle tipologie:	1.1 Articolo in Rivista

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