Abstract
Feynman diagram techniques are used to calculate angular distributions of C 12 → 3α for states in C 12 with spin 0 +, 1 −, 2 +. The breakup is assumed to proceed sequentially through the 0 +, 2 + states of Be 8. The extent to which the sequential mode dominates provides a determination of the nature of the states of C 12 in terms of the cluster model. Pure sequential decay would indicate that these states in C 12 are well described as being cluster model states with an alpha particle bound to a Be 8 nucleus. Angular distributions are presented for unpolarized initial states and for 2 + states of arbitrary polarization. Application is made to states which have been studied experimentally.
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