Alpha decay half-lives of superheavy nuclei in the WKB approximation (original) (raw)
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International Journal of Modern Physics E
The α decay potential barriers are determined in the cluster-like shape path within a generalized liquid drop model including the proximity effects between the α particle and the daughter nucleus and adjusted to reproduce the experimental Qα. The α emission half-lives are determined within the WKB penetration probability. Calculations using previously proposed formulae depending only on the mass and charge of the alpha emitter and Qα are also compared with new experimental alpha-decay half-lives. The agreement allows to provide predictions for the α decay half-lives of other still unknown superheavy nuclei using the Qα determined from the 2003 atomic mass evaluation of Audi, Wapstra and Thibault.
Α-Decay Half-Lives of Superdeformed Superheavy Nuclei
2013
We calculate the binding energy, root-mean-square radius, and quadrupole deformation parameter for the recent, possibly discovered superheavy element Z = 122, using the axially deformed relativistic mean-field (RMF) and nonrelativistic Skyrme Hartree-Fock (SHF) formalisms. The calculation is extended to include various isotopes of Z = 122 element, starting from A = 282 to A = 320. We predict highly deformed structures in the ground state for all the isotopes. A shape transition appears at about A = 290 from a highly oblate to a large prolate shape, which may be considered as the superdeformed and hyperdeformed structures of the Z = 122 nucleus in the mean-field approaches. The most stable isotope (largest binding energy per nucleon) is found to be 302 122, instead of the experimentally observed 292 122.
α-decay lifetime in superheavy nuclei withA>282
Physical Review C, 2008
Nuclei with A > 282 have been studied in the Relativistic Mean Field approach using the force FSU Gold and a zero range pairing interaction. The Euler-Lagrange equations have been solved in the coordinate space. Alpha nucleus potential has been constructed with the DDM3Y1 interaction, which has an exponential density dependence, in the double folding model using the nucleon densities in the daughter nucleus and the α particle. Half lives of α decay have been calculated for tunneling of the α particle through the potential barrier in the WKB approximation and assuming a constant preformation probability. The resulting values agree well with experimental measurements.
International Journal of Modern Physics E, 2016
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 tha...
Alpha Decay of Superheavy Nuclei
Arxiv preprint arXiv:1102.2803, 2011
Recently synthesis of superheavy nuclei has been achieved in hot fusion reactions. A systematic theoretical calculation of alpha decay half-lives in this region of the periodic system, may be useful in the identification of new nuclei in these type of reactions. Alpha decay half-lives are ...
Physical Review C, 2013
The radius of a nucleus is one of the important quantities in nuclear physics. Although there are many researches on ground-state properties of superheavy nuclei, researches on charge radii of superheavy nuclei are rare. In this article, nuclear root-mean-square (rms) charge radii of heavy and superheavy nuclei are extracted from the experimental α-decay data. α-decay calculations are performed within the generalized density-dependent cluster model, where α-decay half-lives are evaluated using quasibound state wave functions. The charge distribution of daughter nuclei is determined in the double-folding model to reproduce the experimental α-decay half-lives. The rms charge radius is then calculated using the resulting charge distribution. In addition, a simple formula is also proposed to calculate nuclear charge radii with the experimental α-decay energies and half-lives. The formula is directly derived from the Wentzel-Kramers-Brillouin barrier penetration probability with some approximations. The two different methods show good agreement with the experimental data for even-even nuclei, and the deduced results are consistent with other theoretical models. Moreover, nuclear radii of heavy and superheavy nuclei with Z = 98-116 are extracted from the α-decay data, for which α decay is a unique tool to probe nuclear sizes at present. This is the first result on nuclear charge radii of superheavy nuclei based on the experimental α-decay data.
Theoretical studies on the modes of decay of superheavy nuclei
Physical Review C, 2016
The decay modes of recently synthesized superheavy nuclei are investigated by comparing the α-decay half-lives with the spontaneous fission half-lives. α-decay half-lives are calculated using the Coulomb and proximity potential model for deformed nuclei (CPPMDN). The agreement between theoretical and experimental α half-lives shows the predictability of the CPPMDN in the superheavy region. A modified formula is proposed for calculating the spontaneous fission half-lives including the shell correction. The agreement between theoretical predictions and experimental results of spontaneous fission half-lives is satisfactory for heavy and superheavy nuclei ranging from Th to Fl. A comparison between the spontaneous fission half-lives computed using eight different formalisms is performed for even-even superheavy nuclei in the range of 108 Z 120. Even though all these models can reproduce the experimental spontaneous fission half-lives, model-to-model variations in predicting the fission half-lives in superheavy region is evident from the study.
Superheavy Nuclei and Related Phenomena
IOSR Journal of Applied Physics, 2017
An overview of decay modes of superheavy nuclei, the proton decay, the alpha decay, the cluster decay and the spontaneous fission, have been studied by considering the isotopes of darmstadtium (Z = 110) within the range 256 ≤ A ≤ 275. It is seen that the isotopes 256-262 Ds are proton emitters. The proton decay half-lives were calculated using the Gamow like model. Alpha decay half-lives and cluster decay half-lives were calculated using the Coulomb and proximity potential model (CPPM). Alpha decay half-lives were also calculated using Viola-Seaborg semi-empirical relationship, Universal cure of Poenaru et al., analytical formula of Royer et al., and the Universal decay law for a theoretical comparison. Spontaneous fission halflives were evaluated using the new shell-effect-dependent formula proposed by Santhosh et al. The semiempirical formula of Xu et al., formula proposed by Bao et al., and the formula of Ren et al., have been also used for calculating the spontaneous fission half-lives. From our study it is seen that most of the superheavy nuclei are prone to proton decay, the alpha decay, the cluster decay and the spontaneous fission.