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 decay and cluster radioactivity of nuclei of interest to the synthesis of 
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, 120 isotopes

Poenaru, D. N.; Gherghescu, R. A.

doi:10.1103/physrevc.97.044621

Cited by 57 publications

(30 citation statements)

References 33 publications

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“…This phenomenon, first observed in 1984 (Rose and Jones, 1984) as the emission of 14 C from 223 Ra, has since been confirmed in a number of heavy nuclei with Z > 86, which decay by emitting light clusters between 14 C and 34 Si, as well as in superheavy nuclei with Z ≤ 116 (Itkis et al, 2015;Kozulin et al, 2014). For superheavy nuclei with Z ≥ 118, cluster radioactivity is expected to become competitive with alpha decay and spontaneous fission (Poenaru and Gherghescu, 2018;Poenaru et al, 2011Poenaru et al, , 2012Poenaru et al, , 2013Poenaru et al, , 2015Santhosh and Nithya, 2018a;Zhang and Wang, 2018). Microscopically, cluster emission can be considered as an extremely asymmetric fission, with the heavy fragment corresponding to a nucleus in the neighborhood of the doubly-magic 208 Pb (Warda and Robledo, 2011).…”

Section: Fissionmentioning

confidence: 75%

Colloquium : Superheavy elements: Oganesson and beyond

et al. 2019

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During the last decade, six new superheavy elements were added into the seventh period of the periodic table, with the approval of their names and symbols. This milestone was followed by proclaiming 2019 the International Year of the Periodic Table of Chemical Elements by the United Nations General Assembly. According to theory, due to their large atomic numbers, the new arrivals are expected to be qualitatively and quantitatively different from lighter species. The questions pertaining to superheavy atoms and nuclei are in the forefront of research in nuclear and atomic physics, and chemistry. This Colloquium offers a broad perspective on the field and outlines future challenges. References

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Section: Fissionmentioning

confidence: 75%

Colloquium : Superheavy elements: Oganesson and beyond

et al. 2019

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“…for even-even, even-odd, odd-even and odd-odd isotopes, respectively. The models mentioned above strongly depend on the even-odd property of the number of proton Z and neutron N. Since the heavy nuclei often have a strong deformation which is dependent on the asymmetry of the nuclei, D. N. Poenaru [11][12][13] proposed a new model based on the Royer formula by adding two factors in terms of the asymmetric factor, I = (N-Z)/A. The new formula reads Notice here that Poenaru model in Equation (3) is dependent on the asymmetry of the nuclei and the evenodd property has been removed.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…In this work, we estimate the half-life to deduce the critical concentrations of the isotopes in the samples corresponding to the limit of the analysis. The α-decay half-lives are re-examined via few methods such as the semi-empirical formulae of the Viola-Seaborg relationship 10 , the Poenaru method [11][12][13] , and the Royer approach 14,15 which have been improved to increase the accuracy of the half-life prediction. The uncertainties of the half-lives, decay constants and the radioactivity of the exotic nuclei in the 232 Th decay chain are also investigated.…”

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confidence: 99%

Critical concentration of the exotic nuclei in the 232Th chain for the alpha analysts

Nguyen

2019

Sci. Tech. Dev. J.

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The 232 Th (Thorium) isotope and its α-decay daughters are ubiquitous in soil, rock, and water environments that are harmful to living organisms if accidentally up-taking. Therefore, it is necessary to detect these isotopes and measure their concentrations in the environments in order to protect living organisms from the contaminated areas. In the measurements using alpha analyzers, the estimation of the critical concentration of the isotopes in the samples is highly demanded to confirm the feasibility of the analysis. In this work, we evaluated the critical concentrations of the radioactive nuclei in the 232 Th chain based on their half-lives and radioactivities for the alpha analysis. In particular, we examined the α-decay half-lives of the mentioned isotopes by using the semi-empirical formulae proposed by Viola-Seaborg, Royer, and Poenaru to estimate their radioactivities and decay constants. The predicted half-lives were then normalized by their average values and compared with the NuDat data of the National Nuclear Data Center (Brookhaven National Laboratory). The relationships between the estimated half-lives and the NuDat data are deduced as linear functions. The critical concentration of the isotopes is determined based on the decay constants following the decay rule. The results show that most of decay half-lives are in consistent with those obtained from the NuDat data except for the multi-decay-mode isotopes. However, there is a large variation in the average values, 15% -95% (in decimal logarithmic scale), of the half-lives evaluated by different formulae, that consequently leads to large decay constants deviations of 1% -120% from the average values. From these results, we confirmed that the large radioactivity uncertainty because of the half-life deviations should be concerned for the preparation of the environmental samples when using alpha spectrometers. By assuming an efficiency of 100%, we found that the critical concentration for the alpha analysts of the 232 Th nucleus is in a range of 1.5 − 2.5 µ g/(l or kg) in the samples.

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“…The following types of radioactivities have been experimentally confirmed worldwide (Oxford, Moscow, Orsay, Berkeley, Geneva, Dubna, Argonne, Milano, Viena, Lanzhou, Beijing and Livermore) [26]: 14 C, 20 O, 23 F, 22 , [24][25][26] Ne, 28,30 Mg and 32,34 Si from parent nuclides with Z = 87 -96. There are about 26 different successful experiments.…”

Section: Introductionmentioning

confidence: 99%

Cluster Radioactivity

Poenaru

Gherghescu

2020

J. Nucl. Phy. Mat. Sci. Rad. A.

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Cluster radioactivity (spontaneous emission of heavy particles from nuclei) is presented from theoretical point of view in good agreement with experimental results. After a brief hystorical account we give details about the analytical super asymmetric fission (ASAF) model extensively used for predicting the half-lives of heavy and superheavy (Z ≥ 104) elements. For the already measured 26 cluster decays (from 14C to 32,34Si of parent nuclides with Z = 87-96) it is clear that cluster radioactivity is a rare phenomenon in the best case about 9 orders of magnitude weaker than the competing alpha decay. Then we show the theoretical possibility of a strong cluster decay compared to alpha decay for some superheavy nuclei with Z ≥ 122, e.g. 306122; 310-314122; 306-324124, and 311-323124.

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α decay and cluster radioactivity of nuclei of interest to the synthesis of Z=119 , 120 isotopes

Cited by 57 publications

References 33 publications

Colloquium : Superheavy elements: Oganesson and beyond

Colloquium : Superheavy elements: Oganesson and beyond

Critical concentration of the exotic nuclei in the 232Th chain for the alpha analysts

Cluster Radioactivity

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