P. Jachimowicz
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View article: Candidates for three-quasiparticle $K$-isomers in even-odd Fm-Cn nuclei
Candidates for three-quasiparticle $K$-isomers in even-odd Fm-Cn nuclei Open
Following our study of possible $K$-isomers in odd-even Md-Rg nuclei, here we continue with searching for three-quasiparticle 1$ν$2$π$ and 3$ν$ isomer candidates in even-odd Fm - Cn nuclei. We use the same approach to calculate energies of…
View article: Entropies, level-density parameters and fission probabilities along the triaxially- and axially-symmetric fission paths in 296Lv
Entropies, level-density parameters and fission probabilities along the triaxially- and axially-symmetric fission paths in 296Lv Open
We investigate the variation of statistical properties of the fissile nucleus, especially entropy, and nuclear level density, along different fission paths. The calculations were focused on comparing axial and triaxial trajectories leading…
View article: Examination of static fission properties of $$^{236}$$U and $$^{233}$$Th using Cassinian oval parametrization within the macroscopic–microscopic approach
Examination of static fission properties of $$^{236}$$U and $$^{233}$$Th using Cassinian oval parametrization within the macroscopic–microscopic approach Open
We have conducted a thorough analysis of the potential energy surfaces (PES) in $$^{236}$$ U and $$^{233}$$ Th using the Cassini-ovals parameterization within the macro–micro approach. We employed the state-of-the-art immersion water…
View article: Entropies, level-density parameters, and fission probabilities along the triaxially- and axially-symmetric fission paths in $^{296}$Lv
Entropies, level-density parameters, and fission probabilities along the triaxially- and axially-symmetric fission paths in $^{296}$Lv Open
We employ a statistical approach to investigate the influence of axial asymmetry on the nuclear level density and entropy along the fission pathways of a superheavy nucleus, explicitly focusing on the $^{296}$Lv isotope. These pathways are…
View article: Candidates for three-quasiparticle $K$-isomers in odd-even Md-Rg nuclei
Candidates for three-quasiparticle $K$-isomers in odd-even Md-Rg nuclei Open
We performed a search for three-quasiparticle high-$K$ isomer candidates in odd-even Md - Rg nuclei by considering the lowest lying 1$π$2$ν$ and 3$π$ excitations. Our approach involves calculating the energies of different nuclear configur…
View article: Multi-step particle emission probabilities in superheavy nuclei at moderate excitation energies
Multi-step particle emission probabilities in superheavy nuclei at moderate excitation energies Open
The probabilities of xn-, pxn-, and αxn-evaporation channels in excited superheavy nuclei were evaluated using the Monte Carlo method. The calculations utilized microscopically determined nuclear level densities and were compared with resu…
View article: Multi-step particle emission probabilities in superheavy nuclei at moderate excitation energies
Multi-step particle emission probabilities in superheavy nuclei at moderate excitation energies Open
The probabilities of $xn$-, $pxn$-, and $αxn$-evaporation channels in excited superheavy nuclei were evaluated using the Monte Carlo method. The calculations utilized microscopically determined nuclear level densities and were compared wit…
View article: First observation of high-K isomeric states in $$^{249}$$Md and $$^{251}$$Md
First observation of high-K isomeric states in $$^{249}$$Md and $$^{251}$$Md Open
View article: Energy dependent ratios of level-density parameters in superheavy nuclei
Energy dependent ratios of level-density parameters in superheavy nuclei Open
The nuclear level densities and level-density parameters in fissioning nuclei at their saddle points of fission barriers - $a_{f}$, as well as those for neutron - $a_{n}$, proton - $a_{p}$ , and $α$-particle - $a_α$ emission residues at th…
View article: Rate of decline of the production cross section of superheavy nuclei with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>114</mml:mn><mml:mo>–</mml:mo><mml:mn>117</mml:mn></mml:mrow></mml:math> at high excitation energies
Rate of decline of the production cross section of superheavy nuclei with at high excitation energies Open
The production cross sections of superheavy nuclei with charge numbers 114–117 are predicted in the (5–9)n evaporation channels of the Ca48-induced complete fusion reactions for future experiments. The estimates of synthesis capabilities a…
View article: Level-density parameters in superheavy nuclei
Level-density parameters in superheavy nuclei Open
We systematically study the nuclear level densities of superheavy nuclei,\nincluding odd systems, using the single-particle energies obtained with the\nWoods-Saxon potential diagonalization. Minimization over many deformation\nparameters f…
View article: First observation of high-K isomeric states in Md-249 and Md-251
First observation of high-K isomeric states in Md-249 and Md-251 Open
Decay spectroscopy of the odd-proton nuclei $^{249}$Md and $^{251}$Md has\nbeen performed. High-$K$ isomeric states were identified for the first time in\nthese two nuclei through the measurement of their electromagnetic decay. An\nisomeri…
View article: Properties of heaviest nuclei with $98\leq Z \leq 126$ and $134 \leq N \leq 192$
Properties of heaviest nuclei with $98\leq Z \leq 126$ and $134 \leq N \leq 192$ Open
We systematically determine ground-state and saddle-point shapes and masses for 1305 heavy and superheavy nuclei with $Z=98-126$ and $N=134-192$, including odd-$A$ and odd-odd systems. From these, we derive static fission barrier heights, …
View article: Possibilities of direct production of superheavy nuclei with Z=112–118 in different evaporation channels
Possibilities of direct production of superheavy nuclei with Z=112–118 in different evaporation channels Open
The production cross sections of heaviest isotopes of superheavy nuclei with charge numbers 112–118 are predicted in the xn–, pxn–, and αxn–evaporation channels of the 48Ca-induced complete fusion reactions for future experiments. The esti…
View article: Possibilities of direct production of superheavy nuclei with Z=112--118 in different evaporation channels
Possibilities of direct production of superheavy nuclei with Z=112--118 in different evaporation channels Open
The production cross sections of heaviest isotopes of superheavy nuclei with charge numbers 112--118 are predicted in the $xn$--, $pxn$--, and $αxn$--evaporation channels of the $^{48}$Ca-induced complete fusion reactions for future experi…
View article: Sizes and shapes of very heavy nuclei in high-K states
Sizes and shapes of very heavy nuclei in high-K states Open
We have investigated shapes and sizes of selected two- and four-quasiparticle \mbox{high-$K$} states in nobelium and rutherfordium isotopes within the microscopic-macroscopic model with the deformed Woods-Saxon potential. Excited nuclear c…
View article: Static fission properties of actinide nuclei
Static fission properties of actinide nuclei Open
Fission barriers heights and excitation energies of superdeformed isomeric\nminima are calculated within the microscopic - macroscopic Woods - Saxon model\nfor 75 actinide nuclei for which the experimental data are known.\n State - of - th…
View article: Lifetime of the recently identified <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mn>10</mml:mn><mml:mo>+</mml:mo></mml:msup></mml:math> isomeric state at 3279 keV in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Nd</mml:mi><mml:mprescripts/><mml:none/><mml:mn>136</mml:mn></mml:mmultiscripts></mml:math> nucleus
Lifetime of the recently identified isomeric state at 3279 keV in the nucleus Open
Background:
\nThe γ softness of 136Nd makes it possible to study the shape changes induced by two-proton or
\ntwo-neutron excitation.
\nPurpose:
\nWe measure the lifetimes of two-quasiparticle states of the bands based on the 10+ states at…
View article: Hindered <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> decays of heaviest high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>K</mml:mi></mml:math> isomers
Hindered decays of heaviest high- isomers Open
To find candidates for long-lived high-K isomers in even-even Z=106-112\nsuperheavy nuclei we study dominant alpha-decay channel of two- and\nfour-quasi-particle configurations at a low excitation. Energies are calculated\nwithin the micro…
View article: Effect of non-axial octupole shapes in heavy and superheavy nuclei
Effect of non-axial octupole shapes in heavy and superheavy nuclei Open
We search for effects of tetrahedral deformation $\beta_{32}$ over a range of $\sim 3000$ heavy and superheavy nuclei, $82\leq Z \leq 126$, using a microscopic-macroscopic model based on the deformed Woods-Saxon potential, well tested in t…
View article: Adiabatic fission barriers in superheavy nuclei
Adiabatic fission barriers in superheavy nuclei Open
Using the microscopic-macroscopic model based on the deformed Woods-Saxon\nsingle-particle potential and the Yukawa-plus-exponential macroscopic energy we\ncalculated static fission barriers $B_{f}$ for 1305 heavy and superheavy nuclei\n$9…
View article: Fusion-fission probabilities, cross sections, and structure notes of superheavy nuclei
Fusion-fission probabilities, cross sections, and structure notes of superheavy nuclei Open
\nFusion – fission probabilities in the synthesis of heaviest elements are discussed in the context of the latest experimental reports. Cross sections for superheavy nuclei are evaluated using the “Fusion by Diffusion” (FBD) model. Predict…
View article: Candidates for long-lived high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>K</mml:mi></mml:math>ground states in superheavy nuclei
Candidates for long-lived high-ground states in superheavy nuclei Open
On the basis of systematic calculations for 1364 heavy and superheavy nuclei, including odd-systems, we have found a few candidates for high-K ground states in superheavy nuclei. The macroscopic-microscopic model based on the deformed Wood…
View article: Superheavy Nuclei — Structure, High-K Ground States, Limits of Stability
Superheavy Nuclei — Structure, High-K Ground States, Limits of Stability Open