Summary
The large value of the effective total cross-section on nucleons of the three-pion system with 0− quantum numbers, experimentally found from the analysis of coherent nuclear product when the 3π mass is 1.1 GeV, is explained as due to the simulation by a onestep model of a more complicated mechanism, containing as essential ingredient the interference with an intermediate 1+ channel. The model allows us to extract information on the transition 0−-1+.
Riassunto
Dagli esperimenti di produzione coerente su nuclei è stata estratta una sezione d’urto effettiva su nucleone del sistema di tre pioni, con i numeri quantici 0−, che assume un valore grande quando la massa dei tre pioni vale 1.1 GeV. Questo risultato viene spiegato attraverso la simulazione con un processo ad un solo passo di un meccanismo più complicato, la cui caratteristica principale consiste nell’interferenza con un canale intermedio 1+. Il modello proposto permette di ottenere informazioni sulla transizione 0−-1+.
Резюме
Большая величина эффективного полного поперечного сечения на нуклонах для трехпионной системы с квантовыми числами 0−, обнаруженная экспериментально из анализа когерентного ядерного рождения, когда масса 3π составляет 1.1 ГэВ, обьясняется посредством имитации с помощью одноступенчатой модели более сложного механизма, содержащего, как существенный инградиент, интерференцию с промежуточным 1+ каналом. Предложенная модель позволяет нам извлечь информацию о переходе 0−-1+.
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Bertocchi, L., Treleani, D. Coupled-channel model for the 3π propagation in nuclei. Nuov Cim A 34, 193–209 (1976). https://doi.org/10.1007/BF02786985
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DOI: https://doi.org/10.1007/BF02786985