Cold valleys in the radioactive decay of 248–254Cf isotopes

Biju, R.K.; Sahadevan, Sabina; Santhosh, K. P.; Joseph, Antony

doi:10.1007/s12043-008-0023-2

Cited by 14 publications

(14 citation statements)

References 31 publications

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“…We have also studied the cold valleys in the radioactive decay of 248−254 Cf isotopes [24] and the computed alpha decay half-life values are in close agreement with the experimental data. Recently, we have proposed a semi-empirical model [25] for determining the half-lives of radioactive nuclei exhibiting cluster radioactivity.…”

Section: Introductionsupporting

confidence: 64%

Neutron and proton shell closure in the superheavy region via cluster radioactivity in 280–314116 isotopes

Santhosh

Biju

2009

Pramana - J Phys

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Based on the concept of cold valley in fission and fusion, the radioactive decay of superheavy 280−314 116 nuclei was studied taking Coulomb and proximity potentials as the interacting barrier. It is found that the inclusion of proximity potential does not change the position of minima but minima become deeper which agrees with the earlier findings of Gupta and co-workers. In addition to alpha particle minima, the other deepest minima occur for 8 Be, 12,14 C clusters. In the fission region two deep regions are found each consisting of several comparable minima, the first region centred on 208 Pb and the second is around 132 Sn. The cluster decay half-lives and other characteristics are computed for various clusters ranging from alpha particle to 70 Ni. The computed half-lives for alpha decay match with the experimental values and with the values calculated using ViolaSeaborg-Sobiczewski (VSS) systematic. The plots connecting computed Q values and half-lives against neutron number of daughter nuclei were studied for different clusters and it is found that the next neutron shell closures occur at N = 162, 172 and 184. Isotopic and isobaric mass parabolas are studied for various cluster emissions and minima of parabola indicate neutron shell closure at N = 162, 184 and proton shell closure at Z = 114. Our study shows that 276 162 114 is the deformed doubly magic and 298 184 114 is the spherical doubly magic nuclei.

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Section: Introductionsupporting

confidence: 64%

Neutron and proton shell closure in the superheavy region via cluster radioactivity in 280–314116 isotopes

Santhosh

Biju

2009

Pramana - J Phys

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“…This model is modified [32] by incorporating the ground-state deformations β 2 and β 4 of the parent and daughter treating cluster as a sphere and the effect of deformation on the half-lives are studied. We also studied the cold valleys in the radioactive decay of 248−254 Cf isotopes [33] and the computed alpha decay half-life values which closely agree with the experimental data. Recently, we have proposed a semi-empirical model [34] for describing alpha and cluster radioactivity and the formula is applied to parents exhibiting cluster decay and alpha decay.…”

Section: Introductionsupporting

confidence: 55%

Stability of 244–260Fm isotopes against alpha and cluster radioactivity

2009

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Taking Coulomb and proximity potentials as the interacting barrier we have studied the cold valley in the radioactive decay of 244−260 Fm isotopes. It is found that in addition to alpha particle minima, other minima occur at S, Ar and Ca clusters. We have computed the half-lives and other characteristics of different clusters emitted from these parents treating parent, daughter and emitted cluster as spheres. Our study reveals that most of these parents are unstable against alpha and heavy cluster ( 46 Ar, 48,50 Ca) emissions and stable against light cluster emission, except 8 Be from 244−248 Fm isotopes. The most probable clusters from these parents are predicted to be 46 Ar, 48,50 Ca which indicate the role of doubly or near doubly magic clusters (Z = 20, N = 28) and also stress the role of doubly magic 208 Pb daughter. The computed half-lives for alpha decay are in good agreement with the experimental data. It is found that the presence of neutron excess in the parent nuclei slows down the cluster decay process. The effect of quadrupole (β 2) and hexadecapole (β4) deformations of parent and fragments on half-lives are also studied. It is found that inclusion of β2 and β4 reduces the height and shape of the barrier (increases barrier penetrability) and hence the half-life decreases.

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“…Fig. 5 represents the plot for log 10 (S) versus A 2 for the emission of [26][27][28][29][30][31][32] Mg clusters from various 232-236 U, 237 Np, and 236,238 Pu parents. It is clear form the plot that the highest peaks are found at 28,30 Mg, the experimentally observed cluster radioactivity.…”

Section: Resultsmentioning

confidence: 99%

Cluster formation probability in the trans-tin and trans-lead nuclei

2010

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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

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Cold valleys in the radioactive decay of 248–254Cf isotopes

Cited by 14 publications

References 31 publications

Neutron and proton shell closure in the superheavy region via cluster radioactivity in 280–314116 isotopes

Neutron and proton shell closure in the superheavy region via cluster radioactivity in 280–314116 isotopes

Stability of 244–260Fm isotopes against alpha and cluster radioactivity

Cluster formation probability in the trans-tin and trans-lead nuclei

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