Α-Decay Half-Lives of Superdeformed Superheavy Nuclei (original) (raw)
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Superdeformed and hyperdeformed states in Z = 122 isotopes
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.
Structural and decay properties of Z = 132, 138 superheavy nuclei
The European Physical Journal A, 2016
In this paper, we analyze the structural properties of Z = 132 and Z = 138 superheavy nuclei within the ambit of axially deformed relativistic mean-field framework with NL3 * parametrization and calculate the total binding energies, radii, quadrupole deformation parameter, separation energies, density distributions. We also investigate the phenomenon of shape coexistence by performing the calculations for prolate, oblate and spherical configurations. For clear presentation of nucleon distributions, the twodimensional contour representation of individual nucleon density and total matter density has been made. Further, a competition between possible decay modes such as α-decay, β-decay and spontaneous fission of the isotopic chain of superheavy nuclei with Z = 132 within the range 312 ≤ A ≤ 392 and 318 ≤ A ≤ 398 for Z = 138 is systematically analyzed within self-consistent relativistic mean field model. From our analysis, we inferred that the α-decay and spontaneous fission are the principal modes of decay in majority of the isotopes of superheavy nuclei under investigation apart from β decay as dominant mode of decay in 318−322 138 isotopes. PACS. PACS-key discribing text of that key-PACS-key discribing text of that key
Theoretical studies on structural and decay properties of Z=119Z=119Z=119 superheavy nuclei
2017
In this manuscript, we analyze the structural properties of Z=119Z=119Z=119 superheavy nuclei in the mass range of 284 le\lele A le\lele 375 within the framework of deformed relativistic mean field theory (RMF) and calculate the binding energy, radii, quadrupole deformation parameter, separation energies and density profile. Further, a competition between possible decay modes such as alpha−\alpha-alpha−decay, beta−\beta-beta−decay and spontaneous fission (SF) of the isotopic chain of Z=119Z=119Z=119 superheavy nuclei under study is systematically analyzed within self-consistent relativistic mean field model. Moreover, our analysis confirmed that alpha−\alpha-alpha−decay is restricted within the mass range 284 leq\leqleq A leq\leqleq 296 and thus being the dominant decay channel in this mass range. However, for the mass range 297 leq\leqleq A leq\leqleq 375 the nuclei are unable to survive fission and hence SF is the principal mode of decay for these isotopes. There is no possibility of beta−\beta-beta−decay for the considered isotopic chain. In addition...
Relativistic mean-field study of the properties of Z = 117 nuclei and the decay chains of the 293,294 117 isotopes We have calculated the binding energy, root-mean-square radius, and quadrupole deformation parameter for the recently synthesized superheavy element Z = 117, using the axially deformed relativistic mean-field (RMF) model. The calculation is extended to various isotopes of the Z = 117 element, starting from A = 286 till A = 310. We predict almost spherical structures in the ground state for almost all the isotopes. A shape transition appears at about A = 292 from a prolate to an oblate shape structure of the Z = 117 nucleus in our mean-field approach. The most stable isotope (largest binding energy per nucleon) is found to be the 288 117 nucleus. Also, the Q α values and the half-life T α 1/2 for the α-decay chains of 293 117 and 294 117 are calculated, supporting the magic numbers at N = 172 and/or 184.
Structural properties and decay modes of Z = 122, 120 and 118 superheavy nuclei
International Journal of Modern Physics E, 2019
Structural properties and the decay modes of the superheavy elements [Formula: see text] and 118 are studied in a microscopic framework. We evaluate the binding energy, one- and two- proton and neutron separation energy, shell correction and density profile of even and odd isotopes of [Formula: see text] [Formula: see text] which show a reasonable match with FRDM results and the available experimental data. Equilibrium shape and deformation of the superheavy region are predicted. We investigate the possible decay modes of this region specifically [Formula: see text]-decay, spontaneous fission (SF) and the [Formula: see text]-decay and evaluate the probable [Formula: see text]-decay chains. The phenomena of bubble like structure in the charge density is predicted in [Formula: see text], [Formula: see text] and [Formula: see text] with significant depletion fraction around 20–24% which increases with increasing Coulomb energy and diminishes with increasing isospin ([Formula: see text]...
Properties of superheavy nuclei with Z = 124
Physical Review C, 2015
We employ Relativistic Mean Field (RMF) model with NL3 parametrization to investigate the ground state properties of superheavy nucleus, Z = 124. The nuclei selected (from among complete isotopic series) for detailed investigation show that the nucleon density at the center is very low and therefore, these nuclei can be treated as semi-bubble nuclei. The considerable shell gap appears at neutron numbers N = 172, 184 and 198 showing the magicity corresponding to these numbers. The results are compared with the macro-microscopic Finite Range Droplet Model (FRDM) wherever possible.
THE α-DECAY CHAINS OF THE 287,288 115 ISOTOPES USING RELATIVISTIC MEAN FIELD THEORY
We study the binding energy, root-mean-square radius and quadrupole deformation parameter for the synthesized superheavy element Z = 115, within the formalism of rel-ativistic mean field theory. The calculation is dones for various isotopes of Z = 115 element, starting from A = 272 to A = 292. A systematic comparison between the binding energies and experimental data is made.The calculated binding energies are in good agreement with experimental result. The results show the prolate deformation for the ground state of these nuclei. The most stable isotope is found to be 282 115 nucleus (N = 167) in the isotopic chain. We have also studied Qα and Tα for the α-decay chains of 287,288 115.
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...
Investigation of the stability of superheavy nuclei aroundZ=114 andZ=164
Zeitschrift f�r Physik, 1969
The potential-energy-surface has been calculated using a method developed in a previous paper. Two regions of relative stability against spontaneous fission around Z= 114 and Z= 164 are discussed in greater detail. The stability of the quasistable elements against fission is discussed and the stability against alpha-and beta-decay is estimated by using the mass formula of Myers-Swiatecki. It is found that quasistable elements should exist in the regions around Z= 114 and Z= 164.
The ground state and first intrinsic excited state of superheavy nuclei with Z = 120 and N = 160–204 are investigated using both nonrelativistic Skyrme–Hartree–Fock (SHF) and the axially deformed relativistic mean field (RMF) formalisms. We employ a simple BCS pairing approach for calculating the energy contribution from pairing interaction. The results for isotopic chain of binding energy (BE), quadrupole deformation parameter, two neutron separation energies and some other observables are compared with the finite range droplet model (FRDM) and some recent macroscopic–microscopic calculations. We predict superdeformed ground state solutions for almost all the isotopes. Considering the possibility of magic neutron number, two different modes of α-decay chains 292 120 and 304 120 are also studied within these frameworks. The Qα-values and the half-life T α 1/2 for these two different modes of decay chains are compared with FRDM and recent macroscopic–microscopic calculations. The calculation is extended for the α-decay chains of 292 120 and 304 120 from their excited state configuration to respective configuration, which predicts long half-life T α