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[en] High-energy g rays have been observed from the 12C(a,g) reaction decaying from states between 32 and 39 MeV in 16O. A narrow unexpectedly strong line, corresponding to decay to a state at 14.8 +- 0.1 MeV in 16O, was observed with an angular distribution suggesting a strong E2 component. Structure in the excitation function of this transition favors a resonant rather than direct capture mechanism. Comparisons with SU(3)- and shell-model calculations suggest a giant quadrupole excitation built on the 61+ state in 16O
Journal
Physical Review Letters; ISSN 0031-9007; 
; v. 46(14); p. 884-887
; v. 46(14); p. 884-887