3,641 research outputs found
The Oxygen core inside the Magnesium isotopes
We have studied the ground state bulk properties of magnesium isotopes using
axially symmetric relativistic mean field formalism. The BCS pairing approach
is employed to take care of the pairing correlation for the open shell nuclei.
The contour plot of the nucleons distribution are analyzed at various parts of
the nucleus, where clusters are located. The presence of an O core along
bubble like -particle(s) and few {\it nucleons} are found in the Mg
isotopes.Comment: 5 pages, 2 figures and 2 table
Effects of density and parametrization on scattering observables
We calculate the density distribution of protons and neutrons for in the frame-work of relativistic mean field (RMF) theory with NL3
and G2 parameter sets. The microscopic proton-nucleus optical potential for
system is evaluted from Dirac NN-scattering amplitude and the
density of the target nucleus using Relativistic-Love-Franey and
McNeil-Ray-Wallace parametrizations. Then we estimate the scattering
observables, such as elastic differential scattering cross-section, analysing
power and the spin observables with relativistic impulse approximation. We
compare the results with the experimental data for some selective cases and
found that the use of density as well as the scattering matrix parametrization
is crucial for the theoretical prediction.Comment: 3 Figur
Properties of Z=120 nuclei and the \alpha-decay chains of the (292,304)120 isotopes using relativistic and non-relativistic formalisms
The ground state and first intrinsic excited state of superheavy nuclei with
Z=120 and N=160-204 are investigated using both non-relativistic
Skyrme-Hartree-Fock and the axially deformed Relativistic Mean Field
formalisms. We employ a simple BCS pairing approach for calculating the energy
contribution from pairing interaction. The results for isotopic chain of
binding energy, quadrupole deformation parameter, two neutron separation
energies and some other observables are compared with the 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 mode of \alpha-decay chains (292)120 and (304)120
are also studied within these frameworks. The Q_{\alpha}-values and the
half-life T^{\alpha}_{1/2} for these two different mode of decay chains are
compared with FRDM and recent macroscopic-microscopic calculations. The
calculation is extended for the \alpha-decay chains of 292120 and 304120 from
their exited state configuration to respective configuration, which predicts
long half-life T^{\alpha}_{1/2}(sec.).Comment: 25 pages, 10 figures, 4 Tables. arXiv admin note: text overlap with
arXiv:0906.0066, arXiv:1010.505
The evaporation residue in the fission state of Barium nuclei within relativistic mean-field theory
The evaporation residue of Barium isotopes are investigated in a microscopic
study using relativistic mean field theory. The investigation includes the
isotopes of Barium from the valley of stability to exotic proton-rich region.
The ground as well as neck configurations for these nuclei are generated from
their total nucleonic density distributions of the corresponding state. We have
estimated the constituents (number of nucleons) in the elongated neck region of
the fission state. We found the -particle as the constituent of neck of
Ba-isotopes, referred to as the evaporated residue in heavy-ion reaction
studies. A strong correlation between the neutron and proton is observed
throughout the isotopic chain.Comment: 6 pages, 3 figures and 2 table
Probable Decay Modes at Limits of Nuclear Stability of the Superheavy Nuclei
The modes of decay for the even-even isotopes of superheavy nuclei of Z = 118
and 120 with neutron number are investigated in the
framework of the axially deformed relativistic mean field model. The asymmetry
parameter and the relative neutron-proton asymmetry of the surface to
the center () are estimated from the ground state density
distributions of the nucleus. We analyze the resulting asymmetry parameter
and the relative neutron-proton asymmetry of the density play
a crucial role in the mode(s) of decay and its half-life. Moreover, the excess
neutron richness on the surface facets a superheavy nucleus for
decays.Comment: 17 Pages, 03 Figures and 02 Table
Effect of isospin asymmetry in nuclear system
The effect of and meson cross couplings on asymmetry
nuclear systems are analyzed in the frame-work of an effective Field theory
motivated relativistic mean field formalism. The calculations are done on top
of the G2 parameter set, where these contributions are absent. We calculate the
root mean square radius, binding energy, single particle energy (for the
and last occupied orbits), density and spin-orbit interaction
potential for some selected nuclei and evaluate the and
coefficients for nuclear matter as function of and
meson coupling strengths. As expected, the influence of these
effects are negligible for symmetry nuclear system and these effects are very
important for systems with large isospin asymmetry.Comment: 10 page
The surface properties of neutron-rich exotic nuclei within relativistic mean field formalisms
In this theoretical study, we establish a correlation between the neutron
skin thickness and the nuclear symmetry energy for the eveneven isotopes of
Fe, Ni, Zn, Ge, Se and Kr within the framework of the axially deformed
self-consistent relativistic mean field for the non-linear NL3 and
density-dependent DD-ME1 interactions. The coherent density functional method
is used to formulate the symmetry energy, the neutron pressure and the
curvature of finite nuclei as a function of the nuclear radius. We have
performed broad studies for the mass dependence on the symmetry energy in terms
of the neutron-proton asymmetry for mass 70 A 96. From this
analysis, we found a notable signature of a shell closure at = 50 in the
isotopic chains of Fe, Ni, Zn, Ge, Se and Kr nuclei. The present study reveals
an interrelationship between the characteristics of infinite nuclear matter and
the neutron skin thickness of finite nucleiComment: 13 Pages, 07 Figures, and 03 Table
The effect of self interacting isoscalar-vector meson on finite nuclei and infinite nuclear matter
A detailed study is made for the nucleon-nucleon interaction based on
relativistic mean field theory in which the potential is explicitly expressed
in terms of mass and the coupling constant of the meson fields. A unified
treatment for self-coupling of isoscalar-scalar , isoscalar-vector
-mesons and their coupling constant are given with a complete analytic
form. The present investigation is focused on the effect of self-interacting
higher order and field on nuclear properties. An attempt is
made to explain the collapsing stage of nucleon by higher order -field.
Both infinite nuclear matter and the finite nuclear properties are included in
the present study to observe the behaviour or sensitivity of this self
interacting terms.Comment: 11 pages, 7 figures, 1 tabl
Softness of Sn isotopes in relativistic semi-classical approximation
Within the frame-work of relativistic Thomas-Fermi and relativistic extended
Thomas-Fermi approximations, we calculate the giant monopole resonance (GMR)
excitation energies for Sn and related nuclei. A large number of non-linear
relativistic force parameters are used in this calculations. We find that a
parameter set is capable to reproduce the experimental monopole energy of Sn
isotopes, when its nuclear matter compressibility lies within MeV,
however fails to reproduce the GMR energy of other related nuclei. That means,
simultaneously a parameter set can not reproduce the GMR values of Sn and other
nuclei.Comment: 7 pages, 6 figur
Search of double shell closure in the superheavy nuclei using a simple effective interaction
This paper refers to an another attempt to search for spherical double shell
closure nu- clei beyond Z=82, N=126. All calculations and results are based on
a newly developed approach entitled as simple effective interaction. Our
results predict the combination of magic nucleus occurs at N=182
(Z=114,120,126). All possible evidences for the oc- currence of magic nuclei
are discussed systematically. And, the obtained results for all observables
compared with the relativistic mean field theory for NL3 parameter.Comment: 15 pages, 07 Figures, 02 Table
- β¦