scholarly journals Predictions on the alpha decay chains of superheavy nuclei with Z = 121 within the range 290 ≤ A ≤ 339

2016 ◽  
Vol 25 (10) ◽  
pp. 1650079 ◽  
Author(s):  
K. P. Santhosh ◽  
C. Nithya
Keyword(s):  
Spontaneous Fission ◽  
Potential Model ◽  
Analytical Formula ◽  
Superheavy Element ◽  
Alpha Decay ◽  
Mass Range ◽  
Universal Curve ◽  
Proximity Potential ◽  
Deformed Nuclei ◽  
First Time

A systematic study on the alpha decay half-lives of various isotopes of superheavy element (SHE) [Formula: see text] within the range [Formula: see text] is presented for the first time using Coulomb and proximity potential model for deformed nuclei (CPPMDN). The calculated [Formula: see text] decay half-lives of the isotopes within our formalism match well with the values computed using Viola–Seaborg systematic, Universal curve of Poenaru et al., and the analytical formula of Royer. In our study by comparing the [Formula: see text] decay half-lives with the spontaneous fission half-lives, we have predicted [Formula: see text] chain from [Formula: see text]121, [Formula: see text] chain from [Formula: see text]121 and [Formula: see text] chain from [Formula: see text]121. Clearly our study shows that the isotopes of SHE [Formula: see text] within the mass range [Formula: see text] will survive fission and can be synthesized and detected in the laboratory via alpha decay. We hope that our predictions will provide a new guide to future experiments.

Competition between decay modes of superheavy nuclei 281−310Og

2020 ◽  
Vol 29 (10) ◽  
pp. 2050087
Author(s):  
N. Sowmya ◽  
H. C. Manjunatha ◽  
P. S. Damodara Gupta
Keyword(s):  
Spontaneous Fission ◽  
Potential Model ◽  
Superheavy Element ◽  
Alpha Decay ◽  
Cluster Decay ◽  
Superheavy Nuclei ◽  
Temperature Dependent ◽  
Proximity Potential ◽  
Decay Modes

In this work, we have made an attempt to study the cluster-decay half-lives and alpha-decay half-lives of the superheavy nuclei [Formula: see text]Og by considering the temperature-dependent (TD) and also temperature-independent (TID) proximity potential model. The evaluated half-lives were compared with that of the experiments. To predict the decay modes, we have compared the cluster-decay half-lives and alpha-decay half-lives with that of spontaneous fission half-lives. This work also predicts the decay chains of the superheavy nuclei [Formula: see text]Og and finds an importance in the synthesis of further isotopes of superheavy element Oganesson.

Comparison of alpha decay with fission for isotopes of superheavy nuclei Z = 124

2016 ◽  
Vol 25 (09) ◽  
pp. 1650074 ◽  
Author(s):  
H. C. Manjunatha
Keyword(s):  
Superheavy Element ◽  
Alpha Decay ◽  
Superheavy Nuclei ◽  
Universal Curve ◽  
Proximity Potential ◽  
Deformed Nuclei ◽  
Decay Properties ◽  
Semiempirical Relation ◽  
Analytical Formulas ◽  
C 78

We have studied the [Formula: see text]-decay properties of superheavy nuclei (SHN) [Formula: see text] in the range [Formula: see text] using the Coulomb and proximity potential model for deformed nuclei (CPPMDN). The calculated [Formula: see text] half-lives agree with the values computed using the Viola–Seaborg systematic, the universal curve of Poenaru et al. [Phys. Rev. C 83 (2011) 014601; 85 (2012) 034615] and the analytical formulas of Royer [J. Phys. G[Formula: see text] Nucl. Part. Phys. 26 (2000) 1149]. To identify the mode of decay of these isotopes, the spontaneous-fission half-lives were also evaluated using the semiempirical relation given by Xu et al. [Phys. Rev. C 78 (2008) 044329]. The calculated half-lives help to predict the possible isotopes of this superheavy element [Formula: see text]. As we could observe [Formula: see text] chain consistently from the nuclei [Formula: see text]124, we have predicted that these nuclei could not be synthesized and detected experimentally via [Formula: see text] decay as their decay half-lives are too small. The nuclei [Formula: see text]124 were found to have long half-lives and hence could be sufficient to detect them if synthesized in a laboratory.

ALPHA-DECAY STUDIES ON 130-153Eu NUCLEI

2013 ◽  
Vol 22 (11) ◽  
pp. 1350081 ◽  
Author(s):  
K. P. SANTHOSH ◽  
B. PRIYANKA
Keyword(s):  
Experimental Data ◽  
Potential Model ◽  
Alpha Decay ◽  
Shell Closure ◽  
Proximity Potential ◽  
Deformed Nuclei ◽  
Neutron Shell ◽  
Good Agreement ◽  
Neutron Shell Closure

The alpha-decay half-lives of the 24 isotopes of Eu (Z = 63) nuclei in the region 130≤A≤153, have been studied systematically within the Coulomb and proximity potential model (CPPM). We have modified the assault frequency and re-determined the half-lives and they show a better agreement with the experimental value. We have also done calculations on the half-lives within the recently proposed Coulomb and proximity potential model for deformed nuclei (CPPMDN). The computed half-lives are compared with the experimental data and they are in good agreement. Using our model, we could also demonstrate the influence of the neutron shell closure at N = 82, in both parent and daughter nuclei, on the alpha-decay half-lives.

Alpha-decay half-lives of polonium isotopes in the mass range of 186–218

2019 ◽  
Vol 28 (06) ◽  
pp. 1950043 ◽  
Author(s):  
S. S. Hosseini ◽  
H. Hassanabadi ◽  
Dashty T. Akrawy ◽  
S. Zarrinkamar
Keyword(s):  
Experimental Data ◽  
Half Life ◽  
Potential Model ◽  
Alpha Decay ◽  
Mass Range ◽  
Shell Closure ◽  
Proximity Potential ◽  
Neutron Shell ◽  
Neutron Shell Closure

The [Formula: see text]-decay (AD) half-life (HL) of [Formula: see text]Po [Formula: see text] isotopes is studied systematically within the modified Coulomb and proximity potential model (MCPPM). The computed HLs are compared with the existing theoretical formulae including Royer, AKRE, Ren B and MRen B. This study considers the role of neutron shell closure [Formula: see text] on the AD HLs. The comparison with the experimental data indicates the acceptability of the results.

Alpha decay half-lives for heavy and super-heavy isotopes

2017 ◽  
Vol 26 (05) ◽  
pp. 1750024
Author(s):  
S. S. Hosseini ◽  
H. Hassanabadi ◽  
S. Zarrinkamar
Keyword(s):  
Experimental Data ◽  
Kinetic Energy ◽  
Half Life ◽  
Potential Model ◽  
Alpha Decay ◽  
Decay Energy ◽  
Heavy Nuclei ◽  
Proximity Potential ◽  
Empirical Estimates ◽  
Super Heavy Nuclei

We considered the systematics of Alpha-decay (AD) half-life (HL) of super-heavy nuclei (SHN) versus the decay energy and the total [Formula: see text]-kinetic energy. We have considered a potential model with Yukawa proximity potential and thereby calculated the HLs. Our results compared with experimental data and the empirical estimates. Also, we obtained [Formula: see text]-preformation factors from the ratio between theoretical and experimental results for a few super heavy nuclei. The results indicate the acceptability of the approach.

The alpha-decay chains and decay mode predictions of the nuclei Z = 118, 119 and 120

2020 ◽  
Vol 29 (07) ◽  
pp. 2050053
Author(s):  
F. Koyuncu ◽  
A. Soylu
Keyword(s):  
Decay Mode ◽  
Half Life ◽  
Spontaneous Fission ◽  
Theoretical Models ◽  
Alpha Decay ◽  
Quantization Condition ◽  
Experimental Investigations ◽  
Universal Curve ◽  
Wkb Method ◽  
Decay Modes

The alpha decay (AD) chains of the nuclei having [Formula: see text], 119 and 120 have been investigated in terms of different theoretical models. Decay mode results that are presented in this study have been probed over the possible isotopes of the aforementioned nuclei. In the decay mode predictions, the formula of Bao et al. and the formula proposed by Soylu have been used to calculate the spontaneous fission (SF) half-lives. The AD half-lives have been computed by using the Denisov and Khuedenko, Royer, Horoi, the universal decay law (UDL), the Viola–Seaborg–Sobiczewski (VSS), the universal curve (UNIV) formulas and Wentzel–Kramers–Brillouin (WKB) approximation with Bohr–Sommerfeld quantization condition for the nuclei that have the measured experimental half-lives. Therefore, the rms values of the results of the related expressions and WKB method have been determined, in this way, AD half-life calculations of the [Formula: see text], 119 and 120 nuclei have been performed. According to the obtained results, SF half-life values for Bao et al. and Soylu are quite different from one approach to another, the predictions on decay modes of the [Formula: see text], 119 and 120 nuclei show differences. The decay modes produced by using different models used in this study would be important for the predictions of the future experimental investigations.

Estimation of the alpha decay of Platinum isotopes using different versions of theoretical formula

2017 ◽  
Vol 26 (10) ◽  
pp. 1750069 ◽  
Author(s):  
S. S. Hosseini ◽  
H. Hassanabadi ◽  
H. Sobhani
Keyword(s):  
Empirical Formula ◽  
Potential Model ◽  
Scaling Law ◽  
Alpha Decay ◽  
Theoretical Formula ◽  
Proximity Potential ◽  
Modified Formula ◽  
Semi Empirical

The alpha decay half-lives of even–even and even–odd Platinum (Pt) nuclei have been studied within the Coulomb and proximity potential model (CPPM). The present study is restricted to even–even nuclei with [Formula: see text]–198. The results are compared with other calculations such as the Semi-empirical formula (SemFIS) from Poenaru et al. based on fission theory of alpha decay, the Viola–Seaborg (VS), Royer (R) and Brown formulae. Also, the alpha decay half-lives have been calculated using the Scaling law of Brown (SLB), the Universal Decay Law (UDL) of Qi et al., the Scaling Law of Horoi et al. (SLH), and Akrawy–Dorin formula (ADF) of Akrawy and Poenaru, which are the Royer modified formula for alpha decay half-live by adding asymmetry term.

Theoretical prediction of probable isotopes of superheavy nuclei of Z = 122

2016 ◽  
Vol 25 (11) ◽  
pp. 1650100 ◽  
Author(s):  
H. C. Manjunatha
Keyword(s):  
Theoretical Prediction ◽  
Spontaneous Fission ◽  
Decay Channel ◽  
Superheavy Element ◽  
Alpha Decay ◽  
Superheavy Nuclei ◽  
Semiempirical Relation ◽  
Analytical Formulas ◽  
C 78 ◽  
Good Agreement

We have studied the [Formula: see text]-decay half-life and spontaneous fission half-lives of isotopes of superheavy element [Formula: see text] in the range [Formula: see text]. A comparison of calculated alpha half-lives with the literature [D. N. Poenaru, R. A. Gherghescu and W. Greiner, Phys. Rev. C 83 (2011) 014601, D. N. Poenaru, R. A. Gherghescu and W. Greiner, Phys. Rev. C 85 (2012) 034615] and the analytical formulas of Royer [G. Royer, J. Phys. G; Nucl. Part. Phys. 26 (2000) 1149] shows good agreement with each other. To identify the mode of decay of these isotopes, the spontaneous-fission half-lives were also evaluated using the semiempirical relation given by [C. Xu, Z. Ren and Y. Guo, Phys. Rev. C 78 (2008) 044329]. A comparative study on the competition of alpha decay versus spontaneous fission of superheavy nuclei (SHN) reveals that around eight isotopes ([Formula: see text]122) survive fission and have alpha decay channel as the prominent mode of decay and hold the possibility to be synthesized in the laboratory. The alpha decay half-lives and spontaneous fission half-lives of SHN with [Formula: see text], [Formula: see text]–306, with [Formula: see text], [Formula: see text]–300, and with [Formula: see text], [Formula: see text]–297 are also studied. The present study will be useful in the synthesis of superheavy elements [Formula: see text] by using the actinide based reactions with stable projectiles heavier than [Formula: see text]Ca.

scholarly journals Probable cluster decays from 270–318118 superheavy nuclei

2014 ◽  
Vol 23 (10) ◽  
pp. 1450059 ◽  
Author(s):  
K. P. Santhosh ◽  
B. Priyanka
Keyword(s):  
Half Life ◽  
Potential Model ◽  
Scaling Law ◽  
Alpha Decay ◽  
Neutron Number ◽  
Cluster Decay ◽  
Superheavy Nuclei ◽  
Proximity Potential ◽  
Universal Formula ◽  
Good Agreement

The cluster decay process in 270–318118 superheavy nuclei has been studied extensively within the Coulomb and proximity potential model (CPPM), thereby investigating the probable cluster decays from the various isotopes of Z = 118. On comparing the predicted decay half-lives with the values evaluated using 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., it was seen that, our values matches well with these theoretical values. A comparison of the predicted alpha decay half-life of the experimentally synthesized superheavy isotope 294118 with its corresponding experimental value shows that, our theoretical value is in good agreement with the experimental value. The plots for log 10(T1/2) against the neutron number of the daughter in the corresponding decay reveals the behavior of the cluster half-lives with the neutron number of the daughter nuclei and for most of the decays, the half-life was found to be the minimum for the decay leading to a daughter with N = 184. Most of the predicted half-lives are well within the present experimental upper limit (1030 s) and lower limit (10-6 s) for measurements and hence these predictions may be of great use for further experimental investigation on cluster decay in the superheavy region.

Alpha particle preformation factor of spherical nuclei for 67 ≤Z ≤91

2019 ◽  
Vol 34 (05) ◽  
pp. 1950039 ◽  
Author(s):  
S. S. Hosseini ◽  
H. Hassanabadi ◽  
Dashty T. Akrawy
Keyword(s):  
Alpha Particle ◽  
Scaling Law ◽  
Analytical Formula ◽  
Theoretical Models ◽  
Alpha Decay ◽  
Proximity Potential ◽  
Spherical Nuclei ◽  
Experimental Values ◽  
Semi Empirical ◽  
Good Agreement

In this paper, alpha decay half-lives of spherical nuclei in the range [Formula: see text] are studied by considering the Coulomb and proximity potential model (CPPM) and calculating the alpha particle preformation factor. Comparisons are made to existing data in the literature. The half-lives are compared to the experimental values and also with the existing theoretical models, the analytical formula of Royer (R) and also within the modified analytical formula of Royer (MR) and New Akrawy–Poenaru Formula (AKRE) by Akrawy and Poenaru and the semi-empirical model based on fission theory (SemFIS) of Poenaru et al., the Universal Decay Law (UDL) of Qi et al., the Scaling Law of Brown (SLB), the Scaling Law of Horoi et al. (SLH). Compared with the experimental alpha half-lives, it can be found that the half-lives obtained using our formalism is in good agreement with the experimental data.

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