Cluster radioactivity and clustering formation in nuclei

Iriondo, M.; Jerrestam, D.; Liotta, R. J.

doi:10.1016/0375-9474(86)90268-x

Cited by 95 publications

(43 citation statements)

References 20 publications

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“…To derive the universal formula, it was assumed that ν = constant and that S depends only on the mass number of the emitted particle A e [71,74] as the microscopic calculation of the preformation probability [76] of many clusters from 8 Be to 46 Ar had shown that it is dependent only upon the size of the cluster. Using a fit with experimental data for α decay, the corresponding numerical values [71] …”

Section: The Universal Curve (Univ)mentioning

confidence: 99%

Heavy particle radioactivity from superheavy nuclei leading to 298114 daughter nuclei

Santhosh

Priyanka

2014

Nuclear Physics A

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Abstract.The feasibility for the alpha decay and the heavy particle decay from the even-even superheavy (SH) nuclei with Z = 116-124 have been studied within the Coulomb and proximity potential model (CPPM). The Universal formula for cluster decay (UNIV) of Poenaru et al., the Universal Decay Law (UDL) of Qi et al., and the Scaling Law of Horoi et al., has also been used for the evaluation of the decay half lives. A comparison of our predicted half lives with the values evaluated using these empirical formulas are in agreement with each other and hence CPPM could be considered as a unified model for alpha and cluster decay studies. The spontaneous fission half lives of the corresponding parents have also been evaluated using the semi-empirical formula of Santhosh et al. Within our fission model, we have studied cluster formation probability for various clusters and the maximum cluster formation probability for the decay accompanying 298 114 reveals its doubly magic behavior. In the plots for log 10 (T 1/2 ) against the neutron number of the daughter in the corresponding decay, the half life is found to be the minimum for the decay leading to 298 114(Z = 114, N = 184) and this also indicate its doubly magic behavior. Most of the predicted half lives are well within the present upper limit for measurements ) 10 ( 30 2 / 1 s T < and the computed alpha half lives for 290,292 116 agrees well with the experimental data. We have thus confidently indicate towards a new island for the cluster radioactivity around the superheavy isotope 298 114 and its neighbors and we hope to receive experimental information about the cluster decay half lives of these considered SHs', hoping to confirm the present calculations.

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Section: The Universal Curve (Univ)mentioning

confidence: 99%

Heavy particle radioactivity from superheavy nuclei leading to 298114 daughter nuclei

Santhosh

Priyanka

2014

Nuclear Physics A

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“…One finds G ≈ 22.5 for all nuclei with Q = 22. Various attempts have been made to determine the preformation factors P experimentally or theoretically [29,30,31]. The usage of a simple two-body wave function in connection with the Wildermuth condition Eq.…”

mentioning

confidence: 99%

Erratum: α-nucleus potentials, α-decay half-lives, and shell closures for superheavy nuclei [Phys. Rev. C73, 031301(R) (2006)]

Mohr¹

2006

Phys. Rev. C

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Systematic α-nucleus folding potentials are used to analyze α-decay half-lives of superheavy nuclei. Preformation factors of about several per cent are found for all nuclei under study. The systematic behavior of the preformation factors and the volume integrals of the potentials allows to predict α-decay energies and half-lives for unknown nuclei. Shell closures can be determined from measured α-decay energies using the discontinuity of the volume integral at shell closures. For the first time a double shell closure is predicted for Zmagic = 132, Nmagic = 194, and Amagic = 326 from the systematics of folding potentials. The calculated α-decay half-lives remain far below one nanosecond for superheavy nuclei with double shell closure and masses above A > 300 independent of the precise knowledge of the magic proton and neutron numbers. The α-decay of superheavy nuclei has been studied intensively in the last years [1,2,3,4,5,6,7,8,9,10]. In many papers a simple two-body model was applied [11], and in most papers a potential was derived which was able to fit the measured α-decay half-lives of the analyzed nuclei. However, most of the studies (with the exception of [2]) did not attempt to use these potentials for the description of other experimental quantities like e.g. α scattering cross sections or (n,α) or fusion reaction cross sections.Therefore, an alternative approach was followed in [12]. Now the simple two-body model has been combined with systematic α-nucleus folding potentials which are able to describe various properties, and the ratio between the calculated half-life T calc 1/2,α and the experimental half-life T exp 1/2,α has been interpreted as preformation factor P of the α particle in the decaying nucleus. Besides a systematic behavior of the volume integrals of the folding potentials, preformation factors of the order of a few per cent were found for a large number of nuclei [12,13].Only for very few light nuclei some levels have been found where a simple two-body model can exactly reproduce the experimental half-lives or widths, e.g. 12,15]. Already for 20 Ne = 16 O ⊗ α the calculated widths are somewhat larger than the experimentally observed ones [16]. Any simple two-body model with a realistic potential must provide half-lives identical or shorter than the experimental value, because the two-body model assumes a pure α cluster wave function by definition, whereas any realistic wave function is given by the sum over many different configurations. Thus, preformations of a few per cent are a quite natural finding for superheavy nuclei.The following ingredients were used in this paper. The α-nucleus potential was calculated from a double-folding procedure with an effective interaction [12,17,18]. The nuclear densities were taken from [19] T . The total potential is given by the sum of the nuclear potential V N (r) and the Coulomb potential V C (r):The Coulomb potential is taken in the usual form of a homogeneously charged sphere where the Coulomb radius R C has been chosen identically with the rms ...

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“…One thus obtained that F is of order unity for protons, as P is, but of order 10 −2 for alpha particles and of order 10 −5 for 8 Be clusters [46]. The formation probability is the square of this number.…”

Section: The Modelmentioning

confidence: 99%

Molecular structure of highly excited resonant states inMg24and the correspondingBe8
Chen
¹
,
Qi
²
,
Liotta
³

et al. 2010
Phys. Rev. C
11
0
11
0
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Exotic 8 Be and 12 C decays from high-lying resonances in 24 Mg are analyzed in terms of a cluster model. The calculated quantities agree well with the corresponding experimental data. It is found that the calculated decay widths are very sensitive to the angular momentum carried by the outgoing cluster. It is shown that this property makes cluster decay a powerful tool to determine the spin as well as the molecular structures of the resonances.

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Cluster radioactivity and clustering formation in nuclei

Cited by 95 publications

References 20 publications

Heavy particle radioactivity from superheavy nuclei leading to 298114 daughter nuclei

Heavy particle radioactivity from superheavy nuclei leading to 298114 daughter nuclei

Erratum: α-nucleus potentials, α-decay half-lives, and shell closures for superheavy nuclei [Phys. Rev. C73, 031301(R) (2006)]

Molecular structure of highly excited resonant states inMg24and the correspondingBe8
Chen
¹
,
Qi
²
,
Liotta
³

et al. 2010
Phys. Rev. C
11
0
11
0
View full text Add to dashboard Cite

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Cluster radioactivity and clustering formation in nuclei

Cited by 95 publications

References 20 publications

Heavy particle radioactivity from superheavy nuclei leading to 298114 daughter nuclei

Heavy particle radioactivity from superheavy nuclei leading to 298114 daughter nuclei

Erratum: α-nucleus potentials, α-decay half-lives, and shell closures for superheavy nuclei [Phys. Rev. C73, 031301(R) (2006)]

Molecular structure of highly excited resonant states inMg24and the correspondingBe8Chen1, Qi2, Liotta3 et al. 2010Phys. Rev. C110110View full textAdd to dashboardCite

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Molecular structure of highly excited resonant states inMg24and the correspondingBe8
Chen
¹
,
Qi
²
,
Liotta
³

et al. 2010
Phys. Rev. C
11
0
11
0
View full text Add to dashboard Cite