Electromagnetic Decay of Molecular States

Abstract

Electromagnetic transitions from deformed structures based on $\hat{I}\pm$ configurations or on heavier clusters are discussed, drawing the link between multiparticle-multihole excited bands and cluster structures. Enhanced E2 and E1 transitions are reviewed in the light nuclei, ${}^8$Be, ${}^{10}$Be, ${}^{12}$C, ${}^{16}$O, ${}^{18}$O and heavier ones like ${}^{212}$Po. Connections between cluster structures and superdeformed configurations in ${}^{36}$Ar and ${}^{40}$Ca are discussed. What the cluster states based on heavier substructures like ${}^{12}$C and ${}^{16}$O are concerned, recent results on the resonant radiative capture reaction ${}^{12}$C(${}^{16}$O,${\hat{I}}^3$)${}^{28}$Si are presented, in particular the strong decay mode involving the feeding of low-lying ${}^{28}$Si 1${}^{+}$ and 2${}^{+}$ T=1 states by enhanced M1 isovector transitions.

Plenary talk presented at the Cluster12, Conference, 10th International Conference on Clustering Aspects of Nuclear Structure and Dynamics, Debrecen, Hungary, 24-28 September 2012