Half-Lives of Cluster Decay of Neutron Rich Nuclei in Trans-Tin Region

Abstract

In this work, the logarithmic half-life [log 10 (T 1/2 )] values have been reported for the exotic decay of some neutron rich even-even parent nuclei (56 ≤ Z ≤ 64) accompanied by the emission of alpha-like and non-alpha-like clusters in the trans-tin region. These values were calculated by using the single line of universal curve (UNIV) for alpha and cluster radioactive decay as well as the universal decay law (UDL). The half-life values were also separately calculated by considering the interacting nuclear potential barrier as the sum of Coulomb and proximity potentials. The half-life values based on the three calculations mentioned above, were found to agree with one another within a few orders of magnitude. Possible conclusions are drawn based on the present study.

Cluster radioactivity around shell closures: correlation of half-lives with the energy levels of daughter nuclei

“…This radioactive decay mode has been confirmed experimentally by Rose and Jones in 1984 for 14 C radioactivity from 223 Ra [20]. Intense experimental research activity led to the detection of the spontaneous emission of 14 C, 20 O, 23 F, 22,[24][25][26] Ne, 28,30 Mg and 32,34 Si, from various radioactive nuclei in the trans-lead region from 221 87 Fr to 242 96 Cm [21][22][23][24]. In this region, the daughter nuclei are the doubly magic nucleus 208 Pb or its neighbors elucidating the influence of shell effects in the cluster decay.…”

“…The spins of the odd neutron number isotopes of Pb in figure 2(c) are repeated in figure 2(d) and produce the same effect on the change of log T curves with N d variation. Small maxima appear at N d values of 105, 107, 109, and 111 for 30 Ne, 28 Ne, 26 Ne, and 24 Ne, respectively. The maxima behave as a factor preventing neutrons from levels above the neutron gap to form clusters.…”

“…Two islands of cluster emitters have been predicted by several theoretical models [12,[25][26][27][28][29][30] in addition to the cluster decay of radioactive nuclei with Z = 87-96. The first island is located in the trans-tin region where the parent nuclei decay into daughter nuclei close to the doubly magic 100 50 Sn [12,29,30]. The other island exists in the superheavy region [25,26,28].…”

An improved semi-empirical relationship for cluster radioactivity *

“…From the ImSahuA and ImSahuB formulas, the predicted half-lives of Be, C, N, O, Ne, Mg and, Si radioactivity are shown in Table 4; these values are helpful for searching for new cluster emitters in future experiments. Besides the cluster radioactivity of the trans-lead region, a new island of cluster emitters around the doubly magic nucleus Sn was carefully analyzed in previous studies [65][66][67][68][69][70][71][72][73][74][75][76][77][78][79]. Concerning the cluster radioactivity in the trans-tin region, only the half-life of C emission from Ba was measured; its value was s at Dubna (Dubna94) [80] and 1.1 s (1.7 s) at GSI (GSI95) [81,82], respectively.…”

Cluster Decay of 208–238Th Isotopes

“…Since cluster decay is an intermediate process between alpha decay and fission, both alpha and fission-like approaches could be used to investigate cluster emission [3]. In this work, the ground-state to ground-state cluster radioactivity of 208-238 Th, is investigated by using a fission-like model in which the interacting potential barrier is taken to be the sum of Coulomb, proximity and centrifugal potentials [4].…”