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Ismail, M.; Seif, W. M.; Tawfik, Walid; Hussein, A.M.

doi:10.1016/j.aop.2019.03.020

Cited by 15 publications

(7 citation statements)

References 76 publications

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“…Usually it is observed that the predicted magic numbers vary with the method used to calculate the Q-value. In 2019, M. Ismail et al [68], showed that the Q-values calculated from the finite-range droplet model predicted neutron magic numbers of 164, 170, 174, 180, 184 and 198, those based on the Weizsäcker-Skyrme model (WS4) indicated different neutron magic numbers of 172, 178, 184 and 196.…”

Section: Resultsmentioning

confidence: 99%

Theoretical Study on the Formation of 1-neutron and 2-neutron Halo Nuclei via Decay of Elements in Super-Heavy Region

Biju¹,

Prathapan²,

Anjali³

2020

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

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The possibility for the existence of 1-neutron and 2-neutron halo nuclei through the decay of even-even nuclei 270-316116, 272-318118 and 278-320120 in the super-heavy region is studied within the frame work of the Coulomb and Proximity Potential Model (CPPM). Halo structure in neutron rich nuclei with Z<=20 is identified by calculating the neutron separation energies and on the basis of potential energy considerations. The 1n + core configuration of proposed 1-neutron halo nuclei between z=10 and Z=20 is found shifted to 2n + core configuration in higher angular momentum states. The calculation of half-life of decay is performed by considering the proposed halo nuclei as spherical cluster and as deformed nuclei with a rms radius. Except for 15C, the half-life of decay is found decreased when the rms radius is considered. Only the 1-neutron halo nuclei 26F and 55Ca showed half-lives of decay which are less than the experimental limit. None of the proposed 2-neutron halo nuclei have shown a half-life of decay lower than the experimental limit. Also, the probability for the emission of neutron halo nuclei is found to be less in super-heavy region when compared with the clusters of same isotope family. Further, neutron shell closure at neutron numbers 150, 164 and 184 is identified form the plot of log10 T1/2 verses the neutron number of parents. The plots of Q-1/2 verses log10 T1/2 and -ln P verses log10 T1/2 for various halo nuclei emitted from the super-heavy elements are found to be linear showing that Geiger-Nuttall law is applicable to the emission of neutron halo also.

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Section: Resultsmentioning

confidence: 99%

Theoretical Study on the Formation of 1-neutron and 2-neutron Halo Nuclei via Decay of Elements in Super-Heavy Region

Biju¹,

Prathapan²,

Anjali³

2020

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

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“…Besides, the effects of shell structure at N = 126 on the dwell times of the tunneling α-cluster is also discussed by reference The neutron number N = 184 is predicted as a magic number after N = 126 and a deeper valley of α-decay half-lives comes into sight because of the corresponding daughter nuclei with a more stable closed shell structure. In reference [80], a magic number of N = 184 is also raised by comparing various models. Semi-magic number is hard to determine because with the increase mass numbers of the nuclei, in addition to the differences in between the models themselves, the stability of these heavy or SHN also plays a part.…”

Section: The Validation Of Magic Numbersmentioning

confidence: 99%

Theoretical calculations of the nuclear deformation effects on α-decay half-lives for heavy and super-heavy nuclei

Cheng¹,

Ge²,

Cao³

et al. 2021

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

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α-decay half-lives of heavy and super-heavy even–even nuclei, in the range of Z = 80–118, were studied using an improved generalized liquid drop model, in which the deformation effects of both the parent and daughter nuclei are considered. The calculated values reflect a better accuracy of the agreement when compared with the experimental data of known nuclei from Hg to Og. The corresponding standard deviation reduced to 0.3670, which proves that the employed method is reliable to reproduce the α-decay half-lives. Semi-empirical formulas like the Royer formula and the universal decay law were also used for systematic calculations of α-decay half-lives. Based on a detailed analysis of the deformation effects in heavy and super-heavy nuclear regions, it was found that the nuclear deformation has a stronger influence on the super-heavy region. The competition between α-decay and spontaneous fission (SF) was also studied and it was observed that for some isotopes from Pu to Fl, the competition between two decay modes is intense, which reflects that these nuclei may follow both decay modes. A neutron magic number, N = 184, and sub-magic numbers, N = 152 and 162 were observed after the analysis of the α-decay half-lives and the SF half-lives of unknown even–even nuclei.

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“…Chinese Physics C Vol. 44 tracted from the WS4 model [51]. Columns (4-7) present the -decay half-lives calculated using Royer's formula, the UDL, the GLDM with shell correction, and the GLDM with shell correction and CFM , respectively.…”

Section: Comparison With Other Workmentioning

confidence: 99%

“…These methods provide a very good description of the tunnelling of the -particle across the Coulomb barrier for heavy and super heavy nuclei. While it is difficult to describe -decay in a fully microscopic way, many works have considered microscopic modifications in the -decay calculations [39][40][41][42][43][44][45][46].…”

mentioning

confidence: 99%

Calculations of the α-decay properties of Z = 120, 122, 124, 126 isotopes *

Ge¹,

Zhang²,

Cheng³

et al. 2020

Chinese Phys. C

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The α-decay properties of even-Z nuclei with Z = 120, 122, 124, 126 are predicted. We employ the generalized liquid drop model (GLDM), Royer's formula, and universal decay law (UDL) to calculate the -decay half-lives. By comparing the theoretical calculations with the experimental data of known nuclei from Fl to Og, we confirm that all the employed methods can reproduce the -decay half-lives well. The preformation factor and -decay energy show that 120, 122, and 124 might be stable. The -decay half-lives show a peak at Z = 120, N = 184, and the peak vanishes when Z = 122, 124, 126. Based on detailed analysis of the competition between -decay and spontaneous fission, we predict that nuclei nearby N = 184 undergo -decay. The decay modes of 120, 122, 124, and 126 are also presented.

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Effect of choosing theQα-values and daughter density distributions on the magic numbers predicted byα

Cited by 15 publications

References 76 publications

Theoretical Study on the Formation of 1-neutron and 2-neutron Halo Nuclei via Decay of Elements in Super-Heavy Region

Theoretical Study on the Formation of 1-neutron and 2-neutron Halo Nuclei via Decay of Elements in Super-Heavy Region

Theoretical calculations of the nuclear deformation effects on α-decay half-lives for heavy and super-heavy nuclei

Calculations of the α-decay properties of Z = 120, 122, 124, 126 isotopes *

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