S. K. Patra

Interaction cross sections and matter radii of A = 20 isobars

Abstract High-energy interaction cross sections of A = 20 nuclei (20N, 20O, 20F, 20Ne, 20Na, 20Mg) on carbon were measured with accuracies of ≈ 1%. The nuclear matter r.m.s. radii derived from the measured cross sections show an irregular dependence on isospin projection. The largest difference in radii, which amounts to approximately 0.2 fm, has been obtained for the mirror nuclei 20O and 20Mg. The influence of nuclear deformation and binding energy on the radii is discussed. By evaluating the difference in r.m.s. radii of neutron and proton distributions, evidence has been found for the existence of a proton skin for 20Mg and of a neutron skin for 20N.

A systematic study of superheavy nuclei for Z = 114 and beyond using the relativistic mean field approach

Abstract We have studied the structural properties of even-even, neutron deficient, Z = 114–126, superheavy nuclei in the mass region A ∼ 270–320, using an axially deformed relativistic mean field model. The calculations are performed with three parameter sets (NL1, TM1 and NL-SH), in order to see the dependence of the structural properties on the force used. The calculated ground state shapes are found to be parameter dependent. For some parameter sets, many of the nuclei are degenerate in their ground state configuration. Special attention is given to the investigation of the magic structures (spherical shell closures) in the superheavy region. We find that some known magic numbers are absent and new closed shells are predicted. Large shell gaps appear at Z = 80, 92, (114), 120 and 138, N = 138, (164), (172), 184, (198), (228) and 258, irrespective of the parameter sets used. The numbers in parenthesis are those which correspond to relatively smaller gaps. The existence of new magic numbers in the valley of superheavy elements is discussed. It is suggested that nuclei around Z = 114 and N = 164 ∼ 172 could be considered as candidates for the next search of superheavy nuclei. The existence of superheavy islands around Z = 120 and N = 172 or N = 184 double shell closure is also discussed.

Pairing properties in relativistic mean field models obtained from effective field theory

We apply recently developed effective field theory nuclear models in mean field approximation ~parameter sets G1 and G2 ! to describe ground-state properties of nuclei from the valley of b stability up to the drip lines. For faster calculations of open-shell nuclei we employ a modified BCS approach which takes into account quasibound levels owing to their centrifugal barrier, with a constant pairing strength. We test this simple prescription by comparing with available Hartree-plus-Bogoliubov results. Using the new effective parameter sets we then compute separation energies, density distributions, and spin-orbit potentials in isotopic ~is t nic! chains of nuclei with magic neutron ~proton! numbers. The new forces describe the experimental systematics similarly to conventional nonlinear s2v relativistic force parameters like NL3.

Ground-state properties and spins of the odd Z = N + 1 nuclei 61 Ga − 97 In

Binding energies, quadrupole deformation parameters, spins and parities of the neutron-deficient odd

Magic numbers in exotic light nuclei near drip lines

Z=N+1

Relativistic mean field study of light nuclei

nuclei in the

Superdeformed and hyperdeformed states in Z = 122 isotopes

A\sim 80

Shell structure of superheavy nuclei

region are calculated in the relativistic mean field approximation. The ground-state and low-lying configurations of the recently observed

Reaction cross-sections for light nuclei on 12C using relativistic mean field formalism

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Shell overcomes repulsive nuclear force instability

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