Summary
A study has been made of the production of hyperfragments by the interactions of K−-mesons of 3.0 and 5.0 GeV/c momentum in nuclear emulsion. The observed frequencies of production, (3.0±0.1)% and (2.2±0.1)% respectively, are significantly smaller than at lower K−-meson momenta, while the range distributions show a relative increase in the number of hyperfragments of range greater than 5 µm. This increase is attributed to a larger contribution from the fragmentation process, which is especially significant at intermediate ranges [(10÷50) µm], and to greater mean ranges for the heavy hyperfragments, which broaden the peak at short ranges (⩽10 µm). The hyperfragments of range less than 10 µm are mainly heavy residual products of silver and bromine nuclei; their mass numbers differ on the average from those of the parent nuclei by about 30 and 35 nucleon masses for 3.0 and 5.0 GeV/c interactions respectively. Eight examples of π− mesonic decays of heavy hyperfragments, and one probable example of a double hyperfragment, have been observed.
Riassunto
Si è studiata la produzione di iperframmenti nelle interazioni di mesoni K− con impulso di 3.0 e 5.0 GeV/c in emulsioni nucleari. Le frequenze di produzione osservate, rispettivamente (3.0±0.1)% e (2.2±0.1)%, sono significativamente minori che a impulsi inferiori del mesone K−, mentre le distribuzioni dei percorsi mostrano un relativo aumento del numero di iperframmenti di percorso maggiore di 5 µm. Si attribuisce questo aumento ad un maggiore contributo del processo di frammentazione, che è particolarmente significativo per percorsi intermedi [(10÷50) µm], e ai maggiori percorsi medi degli iperframmenti pesanti, che allargano il picco a percorsi brevi (⩽10µm). Gli iperframmenti con percorso inferiore a 10 µm sono principalmente residui pesanti dei nuclei di argento e bromo; i loro numeri di massa differiscono in media da quelli dei nuclei genitori di circa 30 e 35 masse nucleoniche rispettivamente per le interazioni di 3.0 e 5.0 GeV/c. Si sono osservati otto esempi di decadimenti π− mesonici degli iperframmenti pesanti ed un probabile esempio di doppio iperframmento.
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Lemonne, J., Sacton, J., Schorochoff, G. et al. Production of hyperfragments from the interactions of 3.0 GeV/c and 5.0 GeV/c K− mesons with emulsion nuclei. Nuovo Cimento A (1965-1970) 41, 235–248 (1966). https://doi.org/10.1007/BF02754535
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DOI: https://doi.org/10.1007/BF02754535