Within our fission model, the Coulomb and proximity potential model (CPPM)
cluster formation probabilities are calculated for different clusters ranging
from carbon to silicon for the parents in the trans-tin and trans- lead
regions. It is found that in trans-tin region the 12^C, 16^O, 20^Ne and 24^Mg
clusters have maximum cluster formation probability and lowest half lives as
compared to other clusters. In trans-lead region the 14^C, 18, 20^O, 23^F,
24,26^Ne, 28,30^Mg and 34^Si clusters have the maximum cluster formation
probability and minimum half life, which show that alpha like clusters are most
probable for emission from trans-tin region while non-alpha clusters are
probable from trans-lead region. These results stress the role of neutron
proton symmetry and asymmetry of daughter nuclei in these two cases.Comment: 20 pages, 6 figure
Exotic decay of various Nd isotopes emitting4He, 8Be, 12
C, 20Ne, 24Mg, 28Si and 32S was studied taking the potential barrier as the sum of Coulomb and proximity potentials. The predicted half-lives are well within the present upper limit for measurements (T1/2< 1030 s). It is found that 16O and 20Ne emissions from 120Nd are the most favourable for measurements with T1/2 ≈ 1010 s. The predicted lowest half-life time for 20Ne emission from 120Nd, stresses the role of the doubly magic 100Sn daughter in the exotic decay process. The nuclear structure effect and shell effect are evident from the Geiger–Nuttall plots for different clusters. It is found that the presence of neutron excess in the parent nuclei slows down the exotic decay process.
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