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., Ableev; A., Adamo; Agnello, Michelangelo; 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; Iazzi, Felice; A., Lanaro; E., Lodi Rizzini; M., Lombardi; V., Lucherini; A., Maggiora; G., Maneva; S., Marcello; U., Marconi; G. V., Margagliotti; G., Maron; A., Masoni; I., Massa; Minetti, Bruno; 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. - 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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