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Antiproton-nucleus interaction at intermediate energies

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Il Nuovo Cimento A (1965-1970)

Summary

The more recent experimental results in antiproton-nucleus physics from CERN, KEK, Serpukhov and ITEP are reviewed. Some typical experiments are discussed with the aim to underline the capabilities of the antiproton in investigating nuclear physics properties and the agreement between the intranuclear cascade (INC) models and the main bulk of data. Recent theoretical developments, beyond and refining the INC models, such as the «clan picture» and the «trawling effect», are examined. Special attention is reserved to those experimental «cases» which cannot be explained within the conventional framework, indicating the possible evidence of unusual annihilations. The physical meaning of unusual (multi-nucleon) annihilations is recalled. Reactions which can favour multinucleon annihilations, specifically Pontecorvo reactions, are examined. The theoretical models which deal with multinucleon annihilations are recalled, together with the specific signatures, in particular strangeness enhancement. Finally, all the possible experimental evidences, up to now, of unusual annihilations are reported and discussed. In particular, the recent measurement of strangeness production from annihilation on a complex nucleus, performed at ITEP, is here reported for the first time.

Riassunto

Vengono passati in rassegna i più recenti risultati sperimentali nella fisica antiprotone-nucleo ottenuti al CERN, a KEK, a Serpukhov e all’ITEP. Vengono discussi alcuni esperimenti tipici con l’intento di mettere in evidenza le potenzialità dell’antiprotone nello studio della Fisica Nucleare e il sostanziale accordo tra le previsioni dei modelli a cascata intranucleare (INC) e la grande maggioranza dei risultati sperimentali. Sono esaminati recenti sviluppi teorici, al di là e perfezionando i modelli INC, quali il modello a «clan» e l’effetto «trawling». Un’attenzione particolare viene riservata a quei «casi» sperimentali che non trovano spiegazione negli schemi convenzionali e pertanto suggeriscono la possibile evidenza di annichilazioni inusuali. Viene richiamato il significato fisico delle annichilazioni inusuali, o su molti nucleoni. Vengono esaminate quelle reazioni che possono favorire le annichilazioni su molti nucleoni, specificamente le cosiddette reazioni di Pontecorvo. Vengono passati in rassegna i modelli teorici che trattano le annichilazioni su molti nucleoni, con le relative previsioni di specifiche segnature, in particolare l’aumento nella produzione di stranezza. Infine vengono riportate, e discusse, tutte le possibili evidenze sperimentali di annichilazioni inusuali ottenute fino ad oggi. In particolare, vengono riportati per la prima volta in questo lavoro i risultati della recente misura eseguita all’ITEP sulla produzione di stranezza da annichilazione di antiprotoni su nuclei complessi.

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  1. Laboratori Nazionali di Frascati dell’INFN, Casella Postale 13, 00044, Frascati (Roma)

    C. Guaraldo

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Guaraldo, C. Antiproton-nucleus interaction at intermediate energies. Nuov Cim A 102, 1137–1173 (1989). https://doi.org/10.1007/BF02813052

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