Fine structure in the cluster decay of radium isotopes

Half-life times for (14)C cluster emission from various radium isotopes are computed taking interacting potential as the sum of Coulomb and proximity potentials. The half-life time values are compared with experimental data and with the values reported by Poenaru et al using the analytical super-asymmetric fission model (ASAFM). The lowest half-life time for (222)Ra stresses the role of the doubly magic (208)Pb daughter in the exotic decay process. It is found that neutron excess in the parent nucleus slows down the exotic decay process. The high hindrance factor (HF) of the (14)C branch to the ground state (9/2(+)) and the low HF to the first excited state (11/2(+)) of the (209)Pb daughter are in good agreement with the experimental result. The fine structure from (223)Ra gives direct evidence of the presence of a spherical component in the deformed parent nucleus.