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Il Nuovo Cimento A (1965-1970)

, Volume 76, Issue 2, pp 433–446 | Cite as

Virtual Δ-isobar admixture in nuclei

  • M. Dillig
  • W. Knüpfer
Article
  • 11 Downloads

Summary

The excitation of virtual Δ-isobar components in nuclei is discussed in a meson exchange model, including π and ρ exchange together with short-range correlations. We discuss the compatibility of predictions of this model with experimental information on isobar components from the (p,π) reaction and the excitation of pionic, especially 1+, states. In view of the main obstacles for a direct evidence on virtual-isobar components, additional and more comprehensive experimental information and further theoretical progress is needed.

PACS. 24.30

Resonance reactions and scattering 

PACS. 13.75

Hadron-induced low- and intermediate-energy reactions and scattering, energy ≤10 GeV 

PACS. 13.60

Photon and charged-lepton interactions with hadrons 

Виртуальная Δ-изобарная примесь в ядрах

Резюме

Обсуждается возбуждение виртуальных Δ-изобарных компонент в ядрах в рамках модели с обменом мезонами, включая π и ρ обмен вместе с короткодействующими корреляциями. Мы обсуждаем совместимость предсказаний этой модели с экспериментальной информацией об изобарных компонентах из (p,π) реакции и возбуждения пионных, особенно 1+, состояний. Для прямого подтверждения виртуальной изобарной примеси необходимы дополнительная и более всесторонняя экспериментальная информация и дальнейшие теоретические исследования.

Riassunto

Si discute l’eccitazione delle componenti dell’isobaro Δ virtuali in un modello di scambio mesonico, includendo lo scambio di π e ρ insieme alle correlazioni a breve raggio. Si discute la compatibilità delle previsioni di questo modello con le informazioni sperimentali sulle componenti isobariche dalla reazione (p,π) e l’eccitazione degli stati pionici, specialmente 1+. In vista degli ostacoli principali per una prova diretta dei componenti di isobari virtuali occorrono informazioni sperimentali piú ampie e ulteriori progressi teorici.

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Copyright information

© Società Italiana di Fisica 1983

Authors and Affiliations

  • M. Dillig
    • 1
  • W. Knüpfer
    • 1
  1. 1.Institut für Theoretische Physik der Universität Erlangen-NürnbergErlangenB.R.D.

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