Summary
The cross-section for the\(\pi ^ + + ^4 He \to \pi ^ - + 4p\) reaction has been measured with a high-pressure helium streamer chamber triggered by a scintillation counter hodoscope. Measurements were made for angles between 25° and 165°. Supposing the angular distribution of the secondary meson to be isotropic, we obtained the following total cross-section for the double charge exchange:\(\sigma _{tot} = \left( {0.30 \pm 0.15} \right) \cdot 10^{ - 27} cm^2 \). The obtained value turned out to be somewhat smaller than expected from calculations using the pair correlation model.
Riassunto
Si è misurata la sezione d'urto per la reazione\(\pi ^ + + ^4 He \to \pi ^ - + 4p\), utilizzando una camera a steamer ad elio ad alta pressione, comandata da un odoscopio di contatori a scintillazione. La misura è stata fatta per angoli compresi tra 25° e 165°. Supponendo isotropa l'emissione del mesone secondario, abbiamo ottenuto per la sezione d'urto totale di scambio carica il valore\(\sigma _{tot} = \left( {0.30 \pm 0.15} \right) \cdot 10^{ - 27} cm^2 \). Questo valore risulta leggermente inferiore a quello previsto da calcoli basati sul modello di correlazione a coppie.
Резюме
Измерено полное сечение реакции\(\pi ^ + + ^4 He \to \pi ^ - + 4p\) с помощьЮ гелиевой стримерной камеры высокого давления, управляемой сцинтилляционным годоскопом. Измерения проведены для углового интервала от 25° до 165°. Сечение реаклии получено равным\(\sigma _{tot} = \left( {0.30 \pm 0.15} \right) \cdot 10^{ - 27} cm^2 \).
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Falomkin, I.V., Kulyukin, M.M., Lyashenko, V.I. et al. Total cross-section for the double charge exchange reaction\(\pi ^ + + ^4 He \to \pi ^ - + 4p\) at 100 MeVat 100 MeV. Nuov Cim A 22, 333–341 (1974). https://doi.org/10.1007/BF02790621
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DOI: https://doi.org/10.1007/BF02790621