Publications (40)
Fission barriers and probabilities of spontaneous fission for elements with Z100
A. Baran, M. Kowal, P. -G. Reinhard +3
This is a short review of methods and results of calculations of fission barriers and fission half-lives of even-even superheavy nuclei. An approvable agreement of the following ap…
Sensitivity of Isotopic Fission Yields in Actinides to the Macroscopic Liquid-Drop Model: LSD vs ISOLDA
K. Pomorski, A. Augustyn, T. Cap +5
The impact of the macroscopic liquid-drop prescription on isotope-resolved fission-fragment yields in the actinide region is assessed by comparing two alternative parameterizations…
Nuclear Symmetry Energy: constraints from Giant Quadrupole Resonances and Parity Violating Electron Scattering
X. Roca-Maza, B. K. Agrawal, P. F. Bortignon +8
Experimental and theoretical efforts are being devoted to the study of observables that can shed light on the properties of the nuclear symmetry energy. We present our new results…
On spontaneous fission and alpha-decay half-lives of atomic nuclei
K. Pomorski, M. Warda, A. Zdeb
It is shown, that the Gamow-like model with only one adjustable parameter - radius constant is able to reproduce well the alpha-decay half-lives for all even-even nuclei with the p…
Search for shape-isomers in the Pt-Hg-Pb region
J. Bartel, H. Molique, B. Nerlo-Pomorska +2
Potential energy surfaces of nine even-even isotopes of Pt, Hg, and Pb around Pt are evaluated within a macroscopic-microscopic model based on the Lublin-Strasbourg-Drop ma…
Fission modes of mercury isotopes
M. Warda, A. Staszczak, W. Nazarewicz
Background: Recent experiments on beta-delayed fission in the mercury-lead region and the discovery of asym- metric fission in 180 Hg [1] have stimulated theoretical interest in th…
Fission fragment mass yield deduced from density distribution in the pre-scission configuration
M. Warda, A. Zdeb
Static self-consistent methods usually allow to determine the most probable fission fragments mass asymmetry. We have applied random neck rupture mechanism to the nuclei in the con…
Ground state properties of the stable nuclei in various mean field theories
K. Pomorski, P. Ring, G. A. Lalazissis +4
The separation energies of neutrons and protons, binding energies, mean square charge radii, electric quadrupole moments and deformation parameters of the proton and neutron distri…
Survival of Pairing Correlations and Shell Effects at Scission in Finite-Temperature Nuclear Fission: Implications for Odd-Even Staggering
K. Pomorski, A. Augustyn, T. Cap +4
We investigate the finite-temperature evolution of microscopic free-energy corrections in nuclear fission, focusing on pairing and shell effects near scission. The analysis is base…
The pygmy dipole strength, the neutron radius of Pb and the symmetry energy
X. Roca-Maza, M. Brenna, M. Centelles +5
The accurate characterization of the nuclear symmetry energy and its density dependence is one of the outstanding open problems in nuclear physics. A promising nuclear observable i…
Cluster radioactivity in Ba in the HFB theory
M. Warda
Cluster radioactivity in Ba is described as a spontaneous fission with a large mass asymmetry within the self-consistent HFB theory. A new fission valley with large octupol…
Density dependence of the symmetry energy from neutron skin thickness in finite nuclei
X. Viñas, M. Centelles, X. Roca-Maza +1
The density dependence of the symmetry energy around saturation density, characterized by the slope parameter L, is studied using information provided by the neutron skin thickness…
Neutron skin thickness in droplet model with surface width dependence: indications of softness of the nuclear symmetry energy
M. Warda, X. Vinas, X. Roca-Maza +1
We analyze the neutron skin thickness in finite nuclei with the droplet model and effective nuclear interactions. The ratio of the bulk symmetry energy J to the so-called surface s…
Neutron skin of 208Pb, nuclear symmetry energy, and the parity radius experiment
X. Roca-Maza, M. Centelles, X. Viñas +1
A precise determination of the neutron skin thickness of a heavy nucleus sets a basic constraint on the nuclear symmetry energy (the neutron skin thickness is the difference of the…
Analysis of bulk and surface contributions in the neutron skin of nuclei
M. Warda, X. Viñas, X. Roca-Maza +1
The neutron skin thickness of nuclei is a sensitive probe of the nuclear symmetry energy having multiple implications for nuclear and astrophysical studies. However, precision meas…
Origin of the neutron skin thickness of 208Pb in nuclear mean-field models
M. Centelles, X. Roca-Maza, X. Viñas +1
We study whether the neutron skin thickness (NST) of 208Pb originates from the bulk or from the surface of the nucleon density distributions, according to the mean-field models of…
Isospin Dependence of Proton and Neutron Radii within Relativistic Mean Field Theory
M. Warda, B. Nerlo-Pomorska, K. Pomorski
The binding energies, shapes and sizes of even-even beta-stable nuclei with A >= 40 and a few chains of isotopes with Z=50, 56, 82, 94 protons and isotones with N=50, 82, 126 neutr…
Selfconsistent calculations of fission barriers in the Fm region
M. Warda, J. L. Egido, L. M. Robledo +1
The fission barriers of the nuclei 254Fm, 256Fm, 258Fm, 258No and 260Rf are investigated in a fully microscopic way up to the scission point. The analysis is based on the constrain…
Fission half-lives of super-heavy nuclei in a microscopic approach
M. Warda, J. L. Egido
A systematic study of 160 heavy and super-heavy nuclei is performed in the Hartree-Fock-Bogoliubov approach with the finite range and density dependent Gogny force with the D1S par…
First observation of the competing fission modes in the neutron-deficient sub-lead region
I. Tsekhanovich, A. N. Andreyev, K. Nishio +12
Fragment mass distributions from fission of excited compound nucleus Pt have been deduced from the measured fragment velocities. The Pt nucleus was created at the J…
Influence of the single-particle structure on the nuclear surface and the neutron skin
M. Warda, M. Centelles, X. Vinas +1
We analyze the influence of the single-particle structure on the neutron density distribution and the neutron skin in Ca, Ni, Zr, Sn, and Pb isotopes. The nucleon density distribut…
Spontaneous fission half-lives of nuclei in a phenomenological model
A. Zdeb, M. Warda, K. Pomorski
A simple phenomenological model, based on the Åwi{\c a}tecki idea for evaluation of the spontaneous fission half-lives is proposed. The model contains only one adjustable paramete…
Microscopic description of cluster radioactivity in actinide nuclei
M. Warda, L. M. Robledo
Cluster radioactivity is the emission of a fragment heavier than particle and lighter than mass 50. The range of clusters observed in experiments goes from C to …
Scission configuration in the self-consistent calculations with neck constraint
R. Han, M. Warda, A. Zdeb +1
The calculations of the potential energy surface are essential in the theoretical description of the fission process. In the constrained self-consistent approach, the smooth evolut…
Nuclear symmetry energy and neutron skin thickness
M. Warda, M. Centelles, X. Viñas +1
The relation between the slope of the nuclear symmetry energy at saturation density and the neutron skin thickness is investigated. Constraints on the slope of the symmetry energy…
Cluster radioactivity of Th isotopes in the mean-field HFB theory
L. M. Robledo, M. Warda
Cluster radioactivity is described as a very mass asymmetric fission process. The reflection symmetry breaking octupole moment has been used in a mean field HFB theory as leading c…
Fission Fragment Mass and Kinetic Energy Yields of Fermium Isotopes
K. Pomorski, A. Dobrowolski, B. Nerlo-Pomorska +8
A rapidly converging 4-dimensional Fourier shape parametrization is used to model the fission process of heavy nuclei. Potential energy landscapes are computed within the macroscop…
Excitation energy dependence of fission in the mercury region
J. D. McDonnell, W. Nazarewicz, J. A. Sheikh +2
Background: Recent experiments on beta-delayed fission reported an asymmetric mass yield in the neutron-deficient nucleus 180Hg. Earlier experiments in the mass region A=190-200 cl…
Microscopic description of cluster radioactivity fission valleys along isotopic and isotonic chains
M. Warda, A. Zdeb, R. RodrÃguez-Guzmán
Cluster radioactivity has been successfully described as a super-asymmetric fission mode within the microscopic self-consistent Gogny Hartree-Fock-Bogoliubov approximation [Phys. R…
Semiclassical Description of Exotic Nuclear Shapes
X. Viñas, M. Centelles, M. Warda
Exotic nuclear structures such as bubbles and tori are analyzed through semiclassical extended Thomas-Fermi calculations with the Skyrme force SkM. The variational equations fo…
Microscopic pairing in fission dynamics
A. Zdeb, A. Baran, S. A. Giuliani +2
Nuclear fission can be modelled as a quantum tunneling process driven by the interplay between the nuclear binding energy and the collective inertia. Within the Wentzel-Kramers-Bri…
Cluster Radioactivity in Super Heavy Nuclei
M. Warda, A. Zdeb, L. M. Robledo
Cluster radioactivity is an exotic nuclear decay observed in actinides where a light nucleus is emitted while the remaining heavy mass residue is the doubly magic Pb or a n…
Description of the multidimensional potential energy surface in fission of Cf and No
A. Zdeb, M. Warda, L. M. Robledo
The microscopic studies on nuclear fission require the evaluation of the potential energy surface as a function of the collective coordinates. A reasonable choice of constraints on…
Pairing in fission: Mean-field and collective inertias study
A. Zdeb, M. Warda, L. M. Robledo +1
Pairing plays a crucial role in the microscopic description of nuclear fission. Microscopic methods provide access to three quantities related to pairing, namely, the pairing gap (…
Comparison of Self-Consistent Skyrme and Gogny Calculations for Light Hg Isotopes
M. Warda, A. Staszczak, L. Próchniak
The ground-state properties of neutron-deficient Hg isotopes have been investigated by the constrained self-consistent Hartree-Fock-Bogoliubov approach with the Skyrme and Gogny ef…
Nuclear symmetry energy probed by neutron skin thickness of nuclei
M. Centelles, X. Roca-Maza, X. Vinas +1
We describe a relation between the symmetry energy coefficients c_sym(rho) of nuclear matter and a_sym(A) of finite nuclei that accommodates other correlations of nuclear propertie…
Isotope-Resolved Ba and Xe Yields in Actinide Fission and Correlated Heavy--Light Fragment Systematics
K. Pomorski, A. Augustyn, T. Cap +5
Isotope-resolved post-neutron fission yields in the Ba and Xe chains are calculated and benchmarked against evaluated reference data, with emphasis on element-resolved isotopic cha…
Fission dynamics of Cf
A. Zdeb, A. Dobrowolski, M. Warda
The time-dependent generator coordinate method with the gaussian overlap approximation (TDGCM+GOA) formalism is applied to describe the fission of Cf. We perform analysis o…
Study of the neutron skin thickness of Pb in mean field models
X. Roca-Maza, M. Centelles, X. Viñas +1
We study whether the neutron skin thickness of Pb originates from the bulk or from the surface of the neutron and proton density distributions in mean field mo…
Potential energy surfaces and fission fragment mass yields of even-even superheavy nuclei
P. V. Kostryukov, A. Dobrowolski, B. Nerlo-Pomorska +6
Potential energy surfaces and fission barriers of superheavy nuclei are analyzed in the macroscopic-microscopic model. The Lublin-Strasbourg Drop (LSD) is used to obtain the macros…