Superheavy nuclei IX: 1300 ≤ A < 1400 systems

2021 ◽  
Vol 34 (1) ◽  
pp. 54-60
Author(s):  
J. J. Bevelacqua
Keyword(s):  
Mass Region ◽  
Binding Energies ◽  
Superheavy Nuclei ◽  
Enhanced Stability

Binding energies of nuclei are calculated in the mass region 1300 ≤ A < 1400. The calculations are performed using the adjusted Rost interaction, which suggests that a new island of stability exists for Z = 382 and in neighboring systems. Enhanced stability occurs in the <mml:math display="inline"> <mml:mrow> <mml:msubsup> <mml:mrow/> <mml:mn mathvariant="bold"> 382</mml:mn> <mml:mn mathvariant="bold">1344</mml:mn> </mml:msubsup> <mml:msub> <mml:mi mathvariant="bold">X</mml:mi> <mml:mrow> <mml:mn mathvariant="bold">962</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> system.

Superheavy nuclei VIII: 1200≤A < 1300 systems

2020 ◽  
Vol 33 (3) ◽  
pp. 276-282
Author(s):  
J. J. Bevelacqua
Keyword(s):  
Mass Region ◽  
Binding Energies ◽  
Superheavy Nuclei ◽  
Enhanced Stability

Binding energies of nuclei are calculated in the mass region 1200 ≤ A < 1300. The calculations are performed using the adjusted Rost interaction, which suggests that a new island of stability exists for Z = 354 and neighboring systems. Enhanced stability occurs in the <mml:math display="inline"> <mml:mrow> <mml:mmultiscripts> <mml:mi mathvariant="bold">X</mml:mi> <mml:mprescripts/> <mml:mrow> <mml:mn> </mml:mn> <mml:mn>354</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>1226</mml:mn> </mml:mrow> </mml:mmultiscripts> <mml:msub> <mml:mrow/> <mml:mn>872</mml:mn> </mml:msub> </mml:mrow> </mml:math> system.

FURTHER CALCULATIONS ON GROUND-STATE PROPERTIES OF ODD-Z SUPERHEAVY NUCLEI

2008 ◽  
Vol 17 (09) ◽  
pp. 1945-1954
Author(s):  
ZHONGZHOU REN ◽  
DINGHAN CHEN ◽  
YUQING CHEN ◽  
CHANG XU
Keyword(s):  
Ground State ◽  
Mean Field ◽  
Theoretical Models ◽  
Alpha Decay ◽  
Mass Region ◽  
Binding Energies ◽  
Superheavy Nuclei ◽  
Recent Experimental Data ◽  
Mean Field Model ◽  
Ground State Properties

We have investigated the ground-state properties of odd-Z superheavy isotopes with even neutron numbers in previous article (Phys. Rev. C67 064302 (2003)). In this work we extend the previous researches to the ground-state properties of odd-Z isotopic chains with odd neutron numbers. This covers the isotopic chains with Z = 109 - 115 which are current interests of experiments. The ground state properties of these odd-Z superheavy nuclei have been systematically calculated by deformed relativistic mean-field model (RMF) with two sets of force parameters TMA and NL-Z2. The theoretical results from the RMF model are compared with those from the Skyrme-Hartree-Fock model (SHF). The binding energies of two models are in good agreement with each other, but the quadrupole deformations show model dependence in some mass regions. The alpha decay energies from the two theoretical models are also compared with recent experimental data, which include three alpha decay chains of superheavy elements 115 and 113. The reasonable agreement shows the validity of the self-consistent mean-field models for superheavy mass region.

REVIEW ON THEORETICAL STUDIES OF SUPERHEAVY NUCLEI

2006 ◽  
Vol 15 (07) ◽  
pp. 1587-1599 ◽  
Author(s):  
ZHONGZHOU REN ◽  
DINGHAN CHEN ◽  
CHANG XU
Keyword(s):  
Ground State ◽  
Large Mass ◽  
Mass Region ◽  
Superheavy Nuclei ◽  
Theoretical Studies ◽  
Shape Coexistence ◽  
Good Test ◽  
Α Decay ◽  
The Stability ◽  
Theoretical Results

Superheavy elements have provided a good test of the validity of both nuclear structure models and nuclear decay models in a large mass region. We firstly review the recent progress on theoretical studies of superheavy nuclei. Emphasis is placed on the structure and decay of superheavy nuclei. Then theoretical results of odd-odd nuclei with Z = 109 - 115 are presented and discussed. It is clearly demonstrated that there is shape coexistence for the ground state of many superheavy nuclei from different models and many superheavy nuclei are deformed. In some cases superdeformation can become the ground state of superheavy nuclei and it is important for future studies of superheavy nuclei. This can lead to the existence of low-energy isomers in the superheavy region and it plays an important role for the stability of superheavy nuclei. As α-decay and spontaneous fission plays a crucial role for identifications of new elements, we also review some typical models of α-decay half-lives and spontaneous fissions half-lives. Some new views on superheavy nuclei are presented.

scholarly journals High-K Isomers in Light Superheavy Nuclei by PNC-CSM method

2018 ◽  
Vol 178 ◽  
pp. 02024
Author(s):  
Xiao-Tao He
Keyword(s):  
Mass Region ◽  
Rotational Frequency ◽  
Superheavy Nuclei ◽  
Particle State ◽  
Microscopic Mechanism ◽  
High K ◽  
Order Deformation ◽  
State Band ◽  
Configuration Mixing ◽  
K Isomers

The high-K isomeric states in light superheavy nuclei around A = 250 mass region are investigated by the Cranked Shell Model (CSM) with pairing treated by a Particle-Number Conserving (PNC) method. With including the higher-order deformation ε6, both of the high–K multi-particle state energies and the rotational bands in 254No and N = 150 isotone are reproduced well. The isomeric state energies and the microscopic mechanism of kinematic moment of inertia variations versus rotational frequency are discussed. The irregularity of the two-neutron Kπ = 8- state band at ħω ≈ 0:17 in 252No is caused by the configuration mixing with the two-proton Kπ = 8- band. .

TEST OF NL-RA1 RELATIVISTIC EFFECTIVE INTERACTION FOR THE STRUCTURE OF DEFORMED AND SUPERHEAVY NUCLEI

2012 ◽  
Vol 21 (06) ◽  
pp. 1250055 ◽  
Author(s):  
M. RASHDAN
Keyword(s):  
Effective Interaction ◽  
Mean Field Theory ◽  
Mean Field ◽  
Superheavy Element ◽  
Decay Chain ◽  
Alpha Decay ◽  
Binding Energies ◽  
Superheavy Nuclei ◽  
Relativistic Mean Field ◽  
Relative Errors

The NL-RA1 effective interaction of the relativistic mean field theory is employed to study the structure of deformed and superheavy nuclei, using an axially deformed harmonic oscillator basis. It is found that a fair agreement with the experimental data is obtained for the binding energies (BE), deformation parameters and charge radii. Comparison with NL-Z2, NLSH and NL3 interactions show that NL-Z2 gives good binding but larger radii, while NL-SH gives good radii but larger binding. The NL-RA1 interaction is also tested for the new deformed superheavy element with Z≥98. Excellent agreement with the experimental binding is obtained, where the relative error in BEs of Cf, Fm, No, Rf, Sg and Ea (Z = 110) isotopes are found to be of the order ~0.1%. The NL3 predicted larger binding and larger relative errors ~0.2–0.5%. Furthermore, the experimental Q-values of the alpha-decay of the superheavy elements 270110, 288114 and 292116 are satisfactory reproduced by NL-RA1 interaction, where the agreement is much better than that predicted by the phenomenological mass FRDM model. Furthermore, the alpha-decay chain of element 294118 are also better reproduced by NL-RA1 interaction.

GROUND STATE PROPERTIES OF EXTREME NEUTRON RICH ISOTOPES OBSERVED: A RELATIVISTIC MEAN FIELD APPROACH

2011 ◽  
Vol 20 (11) ◽  
pp. 2293-2303 ◽  
Author(s):  
PROVASH MALI
Keyword(s):  
Ground State ◽  
Mean Field ◽  
Mass Region ◽  
Binding Energies ◽  
Droplet Model ◽  
Shell Effects ◽  
Relativistic Mean Field ◽  
Ground State Properties ◽  
Neutron Rich Isotopes ◽  
Good Agreement

The ground state properties namely the binding energy, the root mean square (rms) radius (neutron, proton and charge) and the deformation parameter of 45 newly identified neutron-rich isotopes in the A~71–152 mass region have been predicted in the relativistic mean filed (RMF) framework along with the Bardeen–Cooper–Schrieffer (BCS) type of pairing. Validity of the RMF results with the NL3 effective force are tested for odd-A Zn and Rh isotopic chains without taking the time reversal symmetry breaking effects into consideration. The RMF prediction on the binding energies are in good agreement with the empirical/finite-range droplet model calculation. The shell effects on the rms radii of odd-A Zn and Rh isotopes are nicely reproduced. The possibility of shape-coexistence in the newly identified nuclei is discussed.

AN INVESTIGATION OF THE NUCLEAR STRUCTURES OF EVEN–EVEN NEUTRON-RICH Sr, Zr AND Mo ISOTOPES

2013 ◽  
Vol 28 (05) ◽  
pp. 1350007 ◽  
Author(s):  
HÜSEYIN AYTEKIN ◽  
OZAN ARTUN
Keyword(s):  
Field Theory ◽  
Mean Field Theory ◽  
Mean Field ◽  
Mass Region ◽  
Skyrme Force ◽  
Binding Energies ◽  
Hartree Fock ◽  
Relativistic Mean Field ◽  
Nuclear Structures ◽  
Mo Isotopes

Binding energies and their differences are investigated to evaluate the two-neutron separation energies (S2n), the two-proton separation energies (S2p) and the average proton–neutron interaction strengths (δVpn) of neutron-rich Sr , Zr and Mo isotopes in the mass region A = 86–110, including even–even nuclei. Calculations were performed using the Hartree–Fock–Bogoliubov (HFB) method with different Skyrme force parametrizations. The obtained results are discussed and compared with the results of experimental and relativistic mean-field theory (RMFT).

MODEL OF BINDING ALPHA-PARTICLES AND APPLICATIONS TO SUPERHEAVY ELEMENTS

2005 ◽  
Vol 14 (04) ◽  
pp. 635-643 ◽  
Author(s):  
K. A. GRIDNEV ◽  
S. YU. TORILOV ◽  
D. K. GRIDNEV ◽  
V. G. KARTAVENKO ◽  
W. GREINER
Keyword(s):  
Pair Potential ◽  
Total Potential Energy ◽  
Binding Energies ◽  
Alpha Particles ◽  
Superheavy Nuclei ◽  
Lennard Jones ◽  
Total Potential ◽  
Stability Island ◽  
The Stability ◽  
Good Agreement

A model of nuclear matter built from alpha-particles is proposed. In this model, nuclei possess the molecular-like structure. Analyzing the numbers of bonds, one gets the formula for the binding energy of a nucleus. The structure is determined by the minimum of the total potential energy, where interaction between alpha-particles is pairwise and the pair-potential is of Lennard–Jones type. The calculated binding energies show a good agreement with experiment. Calculations predict the stability island for superheavy nuclei around Z=120.

Calculations of alpha cluster preformation probability for the three even–even superheavy isotopes with atomic number Z = 108,110 and 112

2017 ◽  
Vol 26 (03) ◽  
pp. 1750008 ◽  
Author(s):  
Norah A M Alsaif ◽  
Shahidan Radiman ◽  
Saad M Saleh Ahmed
Keyword(s):  
Atomic Number ◽  
Reasonable Agreement ◽  
Cluster Formation ◽  
Mass Region ◽  
Binding Energies ◽  
Heavy Nuclei ◽  
Formation Model ◽  
Wide Range ◽  
Number Formula ◽  
Alpha Cluster

The accurate calculations of the cluster formation model (CFM) have been extended to determine the alpha cluster preformation probability for the three even–even superheavy isotopes (Hs, Ds and Cn) with atomic number [Formula: see text] and 112 and neutron numbers [Formula: see text] in the mass region from 252 to 300. According to the hypothesized CFM, the calculations of the formation energy and surface energy, which depended on differences of binding energies are crucial for determining the realistic values of the preformation probability. Our results showed reasonable agreement with the results of previous work for the heavy nuclei. In addition, realistic values of the preformation probability certified that CFM can successfully be used to calculate the alpha cluster preformation probability for other wide range of superheavy nuclei.

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