Fine Structure
The fine structure in 14C radioactivity of 223Ra was discussed for the first time by M. Greiner and W. Scheid in 1986. The superconducting spectrometer SOLENO of IPN Orsay has been used since 1984 to identify 14C clusters emitted from 222-224,226Ra nuclei. Moreover it was used to discover the fine structure observing transitions to excited states of the daughter. A transition with an excited state of 14C predicted in Ref. was not yet observed.
Surprisingly, the experimentalists had seen a transition to the first excited state of the daughter stronger than that to the ground state. The transition is favoured if the uncoupled nucleon is left in the same state in both parent and daughter nuclei. Otherwise the difference in nuclear structure leads to a large hindrance.
The interpretation was confirmed: the main spherical component of the deformed parent wave function has an i11/2 character, i.e. the main component is spherical.
Read more about this topic: Cluster Decay
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