A semi-empirical model for alpha and cluster radioactivity

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

doi:10.1088/0954-3899/35/8/085102

Cited by 122 publications

(80 citation statements)

References 68 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. The semi-empirical formula is applied to alpha decay of parents with Z = 85-102 and is compared with experimental data.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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 indicates that shell effects play a key role to select possible cluster emissions and the study of cluster emission can be used to identify shell effects including the very weak sub-shell closures [3][4][5]. Several theoretical approaches can be employed to investigate cluster emission: among them the preformed cluster model (PCM) [3,5,6], in which the cluster is assumed to be preformed in the parent nucleus and the preformation factor for all possible clusters is calculated by solving the Schrödinger equation for the dynamical flow of mass and charge; the super-asymmetric fission model [7][8][9][10][11], which is based on the Gamow's idea of barrier penetration; the unified fission model [12][13][14](some authors name it the Coulomb and proximity potential model); a cluster model with a mean-field cluster potential can also provide a good description of cluster emission [15].…”

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confidence: 99%

Preformation of clusters in heavy nuclei and cluster radioactivity

et al. 2009

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“…After the observation of cluster radioactivity, lots of efforts have been done on both experimental and theoretical fronts for understanding the physics of cluster radioactivity. At present about 20 parent nuclei from 221 Fr to 242 Cm emitting clusters ranging from 14 C to 34 Si are confirmed [4]. For e.g.…”

Section: Introductionmentioning

confidence: 99%

“…For e.g. 14 C from 221 Fr, 221−226 Ra and 226 Th, 20 O from 228 Th, 24,26 Ne from 230,232 Th and 232,234 U, 28,30 Mg from 238 Pu, 32,34 Si from 238 Pu and 241 Am etc. are observed.…”

Section: Introductionmentioning

confidence: 99%

“…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. In this work we would like to explore the stability of 244−260 Fm isotopes against alpha and heavy cluster emissions taking interacting barrier as the sum of Coulomb and proximity potentials.…”

Section: Introductionmentioning

confidence: 99%

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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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A semi-empirical model for alpha and cluster radioactivity

Cited by 122 publications

References 68 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

Preformation of clusters in heavy nuclei and cluster radioactivity

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

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