Alpha Decay Chains of Superheavy Nuclei 278-282Rg (original) (raw)
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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...
Predictions on the alpha decay half lives of superheavy nuclei with Z= 113 in the range 255 ≤A≤ 314
Nuclear Physics A, 2016
An intense study of the alpha decay properties of the isotopes of superheavy element Z=113 have been performed within the Coulomb and proximity potential model for deformed nuclei (CPPMDN) within the wide range 255 ≤ A ≤ 314. The predicted alpha decay half lives of 278 113 and 282 113 and the alpha half lives of their decay products are in good agreement with the experimental data. 6α chains and 4α chains predicted respectively for 278 113 and 282 113 are in agreement with the experimental observation. Our study shows that the isotopes in the mass range 278 ≤ A ≤ 286 will survive fission and can be synthesized and detected in the laboratory via alpha decay. In our study, we have predicted 6α chains from 279 113, 4α chains from 286 113, 3α chains from 280,281,283 113, 2α chains from 284 113 and 1α chain from 285 113. We hope that these predictions will be a guideline for future experimental investigations.
α -decay chains of superheavy nuclei with Z=125
Physical Review C, 2018
The decay properties of the isotopes of Z = 125 within the range 303 A 339 are investigated. The calculation of proton separation energies reveals that isotopes 303−309 125 may decay through proton emission. Four different mass tables are used to show the sensitivity of the mass models used to calculate the Q values as well as the α-decay half-lives. α-decay chains are predicted by comparing the α half-lives calculated within the Coulomb and proximity potential model for deformed nuclei (CPPMDN) [Nucl. Phys. A 850, 34 (2011)] with the spontaneous fission half-lives using the shell-effect-dependent formula [Phys. Rev. C 94, 054621 (2016)]. It is seen that isotopes 310,311 125 show 6α chains. 5α chains can be seen from isotopes 312−318 125. Isotopes 319,320 125 exhibit 2α chains and 323 125 exhibits 1α chain. All the other isotopes, that is, 321,322,324−339 125 may decay through spontaneous fission. The α half-lives using CPPMDN are compared with five other theoretical formalisms and are seen to be matching with each other. We hope that our studies will be helpful in designing future experiments to explore the island of stability.
Alpha Decay Favoured Isotopes of Some Superheavy Nuclei: Spontaneous Fission Versus Alpha Decay
2012
Spontaneous fission and alpha decay are the main decay modes for superheavy nuclei. The superheavy nuclei which have small alpha decay half-life compared to spontaneous fission half-life will survive fission and can be detected in the laboratory through alpha decay. We have studied the alpha decay half-life and spontaneous half-life of some superheavy elements in the atomic range Z = 100-130. Spontaneous fission half-lives of superheavy nuclei have been calculated using the phenomenological formula and the alpha decay half-lives using Viola-Seaborg-Sobiczewski formula (Sobiczewski et al. 1989), semi empirical relation of Brown (1992) and formula based on generalized liquid drop model proposed by Dasgupta-Schubert and Reyes (2007 ). The results are reported here.
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.
arXiv: Nuclear Theory, 2018
In this work study on alpha decay chains emerging from isotopes of Z = 122 superheavy nuclei is carried out with emphasize on nuclear deformations and Langer modification. The interest in this particular superheavy nuclei is due to the recent experimental efforts to synthesize the isotope ^{299}120 in a fusion reaction at the velocity filter SHIP (GSI Darmstadt), which makes synthesis of Z = 122 nuclei to occur in the near future, and in turn will give the experimentalist the chance observe the decays associated with the isotopes of this nuclei. We perform our calculations by choosing the Woods Saxon potential for nuclear interaction, along with Coulomb potential and centrifugal potential within the framework of the WKB method. When the centrifugal term is taken in the total potential and WKB integral is done over 1D radial coordinate, it requires the use of Langer modification wherein (l + 1/2 )^2 replaces l(l +1) for consistency of WKB wave function. Hence we have used this Langer...
Formula for the α decay energy of superheavy nuclei
A formula of α decay energy for superheavy nuclei based on the method of macroscopic model plus shell corrections is proposed. The macroscopic part of this formula is derived from the Bethe-Weizsäcker binding energy formula, and the shell corrections at N = 152 and N = 162 are expressed by the Mexican hat wavelet functions. The parameters of this formula are obtained through fitting to 170 α decay energies for nuclei ranging from Z = 90 to Z = 118 with N ≥ 140. Numerical results show that 170 existing α decay energies can be reproduced very well, the average and standard deviations between theoretical results and experimental data are 0.177 and 0.226 MeV, respectively. The α decay energies of newly synthesized nuclei 293, 294 117 and their α decay products are also reproduced very well. In addition, the α decay energies for nuclei with Z = 110 − 120 are predicted and compared with the results calculated by the macroscopic-microscopic model. Great differences are found for nuclei with Z ≥ 116 and N ≥ 176 due to the shell effects near the hypothetical doubly magic nucleus 298 114 184 in the macroscopic-microscopic model. Therefore, by comparing experimental α decay energies measured in the future with the ones predicted by these two methods, one can obtain useful information about the next proton and neutron magic numbers. In the past 30 years great efforts have been making to synthesize superheavy nuclei [1-9]. The elements 107-113 have been synthesized by the cold fusion reactions at GSI in Germany [1, 2] and RIKEN in Japan [3, 4], and the elements 114-118 have also been synthesized by hot fusion reactions at Dubna in Russia [5, 6]. At the same time experiments for synthesizing superheavy nuclei are also performed at other laboratories, such as Berkeley in America [7, 8] and Lanzhou in China [9]. Very recently, the element 117 has been synthesized at Dubna [6], filling the gap between elements 116 and 118. This discovery facilitates further and deeper studies on the properties of superheavy nuclei. To meet the requirements of experiments, theoretical studies are also performed under various models, such as the macroscopic-microscopic models [10-12], Skyrme-Hartree-Fock and relativistic meanfield models [13-15]. Among theoretical studies the binding energy, α decay energy, and α decay half-lives have been studied intensively [10-24]. All these properties are strongly influenced by the shell effects. However, the predicted proton and neutron magic numbers depend on the models and force parameters. For example, the predicted proton and neutron magic numbers are Z = 124, 126, N = 184 by the Skyrme-Hartree-Fock model, Z = 120, N = 172 by the relativistic mean-field model [13], and Z = 114, N = 184 by
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 ...