Archivio Istituzionale della RicercaAntinucleon-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 , 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 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.
A new measurement of the Pontecorvo reaction anti-p+d --> pi- +p with the OBELIX spectrometer at LEAR / V. G., A., A., A., Agnello, M., F., B., G., B., A., B., P., B., G., B., T., B., M., B., M. P., B., L., B., D., C., M., C., P., C., C., C., M., C., S., C., S., D.C., F., D., et al.. - In: NUCLEAR PHYSICS. A. - ISSN 0375-9474. - 562:(1993), pp. 617-643. [10.1016/0375-9474(93)90132-H]
A new measurement of the Pontecorvo reaction anti-p+d --> pi- +p with the OBELIX spectrometer at LEAR
AGNELLO, MICHELANGELO;IAZZI, Felice;MINETTI, Bruno;
1993
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 , 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 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.
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https://hdl.handle.net/11583/1803213
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