Cluster states and monopole transitions in 16O
Abstract
Cluster structures and monopole transitions in positive parity states of 16O were investigated based on the generator coordinate method calculation of an extended 12C+α cluster model. The ground and excited states of a 12C cluster are taken into account by using 12C wave functions obtained with the method of antisymmetrized molecular dynamics. The 0+2 state of 16O and its rotational members, the 2+1 and 4+1 states are described well by the cluster states dominated by the 12C(0+1)+α structure. Above the 12C(0+2)+α threshold energy, we obtained a 0+ state having the 12C(0+2)+α cluster structure, which is considered to be a candidate for the 4α cluster gas state. The band structures were discussed based on the calculated E2 transition strength. Isoscalar Monopole excitations from the ground state were also discussed.
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