Structural properties and α-decay chains of transfermium nuclei (101≤Z≤110)

Singh, Upindranath; Sharma, R.; Sharma, Priya; Kaushik, M.; Jain, S. K.; Saxena, Gaurav

doi:10.1016/j.nuclphysa.2020.122066

Cited by 12 publications

(11 citation statements)

References 87 publications

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“…(experimental limit of half-lives of cluster emissions). For examples, 21 Na from 226−229 Np, 22 Na from 226−230 Np, 23 Na from 226−233 Np, 24 Na from 226−234 Np, 25,27 Na from 226−237 Np, 26 Na from 226−236 Np and 28 Na from 224−236 Np. Similarly, some possible clusters (Mg-isotopes) emitted from various Pu-isotopes (Z p =94) are 23 Mg from 226−231 Pu, 24,25 Mg from 226−235 Np, 26 Mg from 226−238 Np, 27 Mg from 226−239 Np, and 28,29 Mg from 226−241 Np.…”

Section: Parent Daughter Emittedmentioning

confidence: 99%

“…The importance of angular momentum on the α-decay half-lives has already been established in a few of our recent works [19,20] which has invoked us to probe similar dependence on the cluster decay half-lives. In addition to this, isospin (I = (N − Z)/A) of parent nucleus is found to be pivotal for the case of α-decay in heavy and superheavy nuclei [20][21][22][23][24][25] pointing towards its significance in terms of cluster decay as well. Considering these two effects together, modified UDL formula (new UDL) by Soylu and Qi [26], and improved NRDX formula (named as improved unified formula (IUF)) by Ismail et al [27] have explained recently that angular momentum and isospin are indeed crucial quantities in determining the cluster decay half-lives.…”

Section: Introductionmentioning

confidence: 98%

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Cluster radioactivity in trans-lead region: A systematic study with modified empirical formulas

Jain¹,

Sharma²,

Jain³

et al. 2023

Preprint

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The possibility of cluster emission from trans-lead (86≤Z≤96) region of periodic chart has been explored comprehensively by employing few empirical formulas which are modified by adding angular momentum (l) or isospin-dependent (I = (N − Z)/A) or both terms for the calculation of cluster decay half-lives. These modified versions of the formulas are found with lesser χ 2 per degree of freedom and root mean-square error, in addition to the smaller values of some other statistical parameters, while compared to their corresponding old versions on available 61 experimental data of cluster radioactivity. By applying the modified version of the formula given by Balasubramaniam et al. [PRC 70 (2004) 017301], the most accurate formula among these, half-lives of several clusters i.e. isotopes of Be, B, C, N, O, F, Ne, Na, Mg, and Si are predicted systematically for the several isotopes in the trans-lead region. The contest of cluster emission with α-decay has been investigated in form of branching ratio which brings several potential cluster emissions into the probable decay modes of these nuclei. The accurate prediction of half-lives of such clusters is expected to be crucial for the future experimental observations where α-decay is observed dominantly.

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Section: Parent Daughter Emittedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Cluster radioactivity in trans-lead region: A systematic study with modified empirical formulas

Jain¹,

Sharma²,

Jain³

et al. 2023

Preprint

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“…Q α -values required for these calculations are obtained using expression (16). Modified Manjunatha formula (MMF) [66]:…”

Section: Barrier Penetration and Half-lifementioning

confidence: 99%

Prediction of half-lives of even–even superheavy nuclei

Pathak

Singh

Kaur

et al. 2021

J. Phys. G: Nucl. Part. Phys.

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α-decay half-lives ( T 1 / 2 α -values) of even–even and superheavy nuclei (SHN) are determined employing interaction potential involving Coulomb and proximity potentials. The obtained results are compared with the experimental ones and to assess the precision of the present model in reproducing the experimental half-lives, a comparison is drawn with the other methods as well. We require disintegration energy (Q α -values) as an input in order to predict the ( T 1 / 2 α -values) of an experimentally unknown SHN. So, utilizing periodic-orbit theory within microscopic-macroscopic formalism, we have calculated the binding energies and thereafter, Q α -values of known SHN. The results are found to be in good agreement with the experimental ones. Subsequently, we predict the logarithmic values of T 1 / 2 α ’s for even–even unknown SHN whose atomic numbers lie in 118 ⩽ Z ⩽ 126 regime and compare our results with those calculated employing other theoretical methods. Also, the study of spontaneous fission half-lives and branching ratios leads us to predict the SHN which can be identified through α-decay chains in the laboratories. We believe that this work can play a significant role in the experiments leading to the synthesis and identification of new superheavy elements.

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“…Few of the above-mentioned formulas are refitted using the latest experimental alpha decay half-lives, namely (i) modified Royer GLDM (Rm), modified Viola-Seaborg (VSm1 and VSm2) and modified Sobiczewski-Parkhomenko (SPm1 and SPm2) formulas [41], (ii) a modified version of the Brown empirical formula (mB1 and mB2) [42] (iii) new universal decay law (NUDL), new Royer (NRo) and new Sobiczewski-Parkhomenko (NSP) formulas [43]. Moreover, Manjunatha et al have presented a formula [44] based on secondorder polynomial fitting of Z 0.4 d / √ Q which is subsequently modified in one of our recent works [45].…”

Section: Introductionmentioning

confidence: 99%

Modified empirical formulas and machine learning for α-decay systematics

Saxena¹,

Sharma²,

Saxena

2021

J. Phys. G: Nucl. Part. Phys.

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Latest experimental and evaluated α-decay half-lives between 82 ⩽ Z ⩽ 118 have been used to modify two empirical formulas: (i) Horoi scaling law (2004 J. Phys. G: Nucl. Part. Phys. 30 945), and Sobiczewski formula (2005 Acta Phys. Pol. B 36 3095) by adding asymmetry dependent terms (I and I 2) and refitting of the coefficients. The results of these modified formulas are found with significant improvement while compared with other 21 formulas, and, therefore, are used to predict α-decay half-lives with more precision in the unknown superheavy region. The formula of spontaneous fission (SF) half-life proposed by Bao et al (2015 J. Phys. G: Nucl. Part. Phys. 42 085101) is further modified by using ground-state shell-plus-pairing correction taken from FRDM-2012 and using the latest experimental and evaluated SF half-lives between 82 ⩽ Z ⩽ 118. Using these modified formulas, contest between α-decay and SF is probed for the nuclei within the range 112 ⩽ Z ⩽ 118 and consequently probable half-lives and decay modes are estimated. Potential decay chains of 286−302Og and 287−303119 (168 ⩽ N ⩽ 184: island of stability) are analyzed which are found to be in excellent agreement with available experimental data. In addition, four different machine learning models: XGBoost, random forest, decision trees, and multilayer perceptron (MLP) neural network are used to train a predictor for α-decay and SF half-lives prediction. The prediction of decay modes using XGBoost and MLP are found to be in excellent agreement with available experimental decay modes along with our predictions obtained by the above-mentioned modified formulas.

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Structural properties and α-decay chains of transfermium nuclei (101≤Z≤110)

Cited by 12 publications

References 87 publications

Cluster radioactivity in trans-lead region: A systematic study with modified empirical formulas

Cluster radioactivity in trans-lead region: A systematic study with modified empirical formulas

Prediction of half-lives of even–even superheavy nuclei

Modified empirical formulas and machine learning for α-decay systematics

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