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. RI Galli, Domenico/A-1606-2012; Villa, Mauro/C-9883-2009; Filippi, Alessandra/I-9530-2012

A NEW MEASUREMENT OF THE PONTECORVO REACTION (P)OVER-BAR+D-]PI-+P WITH THE OBELIX SPECTROMETER AT LEAR

PUDDU, GIOVANNA;USAI, GIANLUCA;
1993-01-01

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. RI Galli, Domenico/A-1606-2012; Villa, Mauro/C-9883-2009; Filippi, Alessandra/I-9530-2012
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/109547
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