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Il Nuovo Cimento A (1965-1970)

, Volume 39, Issue 2, pp 193–214 | Cite as

Spectroscopic information from angular correlations and transfer reactions

  • A. Strazzeri
Article

Summary

Three-body reactions X(a, b)Y(c)X in the sequential-decay assumption with the further hypothesis of a pure c transfer mechanism for the reaction X(a, b)Y are considered. In some interesting cases of the class of reactions in which the spin-zero c-nucleon group is transferred in its ground state, with a pure c-particle configuration, and in which some simple assumptions on excited levels of interest of the nucleus Y are given, the DWBA transition amplitude may be expressed in terms of the same c spectroscopic factor, for the decay Y→c+X, appearing in the theoretical form of the angular correlation between the b-particles from the X(a,b)Y reaction and the c-particles from the decay of excited states of the nucleus Y. Some applications of the formalism to α transfer reactions and to α break-up of excited states of the nucleus Y are given.

Спектроскопическая информация из угловых коррелций и реакции с передачей частиц

Резюме

Рассматриваются трехчастичные реакции X(a, b) Y(c)X в предположении последующего распада с дополнительной гипотезой чистого механизма с-передачи для реакции X(a, b)Y. В некоторых интересных случаях для класса реакций, где группа с-нуклонов с нулевым спином передается в основное состояние с чистой с-частичной конфигурацией и в которых делаются некоторые простые предположения о возбужденных уровнях ядра Y, DWBA амплитуда перехода может быть выражена через тот же с-спектроскопический фактор, как и для распада Y→c+Y, который возникает в теоретическом выражении для угловой корреляции между b-частицами из X(a, b)Y реакции и с-частицами из распада возбужденных состояний ядра Y. Рассматриваются некоторые применения предложенного формализма к реакциям с передачей альфа-частиц и к случаю распада альфа-частиц для возбужденных состояний ядра Y.

Riassunto

Si considerano reazioni a tre particelle finali X(a, b)Y(c)X nell'ipotesi di decadimento sequenziale con l'ulteriore ipotesi di trasferimento diretto della particella c, per il meccanismo della reazione X(a, b)Y. In casi interessanti di reazioni in cui il gruppo di nucleoni c, con spin nullo e nel loro stato fondamentale, viene trasferito con una configurazione pura (come quella di particella c) e si adottano ipotesi semplificanti sulla struttura dei livelli in esame del nucleo Y, l'ampiezza di transizione DWBA può essere espressa in termini dello stesso fattore spettroscopico, per il decadimento Y→c+X, che figura nell'espressione teorica che esprime la correlazione angolare tra le particelle b prodotte nella reazione X(a, b)Y e le particelle c provenienti dal decadimento di stati eccitati del nucleo Y. Si considerano alcune applicazioni del formalismo alle reazioni di trasferimento di particella α ed ai processi di emissione α da stati eccitati del nucleo Y.

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Copyright information

© Società Italiana di Fisica 1977

Authors and Affiliations

  • A. Strazzeri
    • 1
    • 2
    • 3
  1. 1.Istituto di Fisica Nucleare dell'UniversitàCatania
  2. 2.Istituto Nazionale di Fisica NucleareSezione di CataniaCataniaItaly
  3. 3.Centro Siciliano di Fisica Nucleare e di Struttura della MateriaCatania

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