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The theory of direct nuclear knock-out reactions with polarized beams

Теория прямых ядерных реакций выбивания с поляриэованными пучками

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Il Nuovo Cimento B (1965-1970)

Summary

A previous statement of the theory of direct nuclear knockout reactions is generalized to include reactions involving the exchange of two-fermion clusters and reactions involving polarized incident beams. The formalism is developed in terms of the distorted-wave Born approximation. Spin-dependent distortions and a finite-range direct interaction are included, but kinematical considerations are neglected assuming the infinitely heavy core for the target and residual nuclei. Coulomb effects, neglected in the previous paper, are taken into account in the present treatment. For cases of the incident beam being unpolarized and polarized, explicit expressions are obtained for the angular distribution, the total cross-section, and the polarization of the emitted particles.

Riassunto

Si generalizza un’affermazione precedente della teoria delle reazioni di knock-out nucleare dirette per includervi reazioni che coinvolgono lo scambio di due ammassi di fermioni e quelle che coinvolgono fasci incidenti polarizzati. Si sviluppa il formalismo in termini dell’approssimazione di Born dell’onda distorta. Si includono distorsioni dipendenti dallo spin e interazioni dirette di raggio finito, ma si trascurano le considerazioni cinematiche supponendo che il bersaglio e i nuclei residui abbiamo un nocciolo infinitamente pesante. In questo trattamento si tiene conto degli effetti coulombiani, trascurati nell’articolo precedente. Nei casi in cui il fascio incidente è non polarizzato o polarizzato, si ottengono espressioni esplicite per le distribuzioni angolari, la sezione d’urto totale e la polarizzazione delle particelle emesse.

Реэюме

Предыдушее утверждение теории прямых ядерных реакций выбивания обобшается, чтобы рассмотреть реакции, включаюшие обмен двумя фермион-ными кластерами, и реакции, включаюшие поляриэованные падаюшие пучки. Раэвивается формалиэм в терминах искаженного волнового борновского приближения. Включаются искажения, эависяшие от спина, и прямое вэаимодействие в конечной области, но кинематическими рассмотрениями пренебрегается, предполагая тяжелую сердцевину для мищени и остаточных ядер. В настояшей трактовке принимается во внимание кулоновские зффекты, которыми пренебрегали в предыдушей статье. Для случаев, когда падаюший пучок неполяриэован и поляриэован, получены точные выражения для углового распределения, полного поперечного сечения и поляриэации испускаемых частиц.

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Supported in part by the U.S. Atomic Energy Commission.

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McRary, J.W., Park, J.Y. The theory of direct nuclear knock-out reactions with polarized beams. Nuovo Cimento B (1965-1970) 55, 525–538 (1968). https://doi.org/10.1007/BF02711660

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  • DOI: https://doi.org/10.1007/BF02711660

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