Density distributions and form factors of the exotic 8B nucleus

Results of charge, neutron and matter densities and related form factors for one- proton halo nucleus 8B are presented using a two- frequency shell model approach. We choose a model space for the core of 7Be different from that of the extra one valence proton. One configuration is assumed for the outer proton to be in 1p1/2 - shell. The results of the matter density distributions are compared with those fitted to the experimental data. The calculated proton and matter density distributions of this exotic nucleus exhibit a long tail behavior, which is considered as a distinctive feature of halo nuclei. Elastic electron scattering form factors of this exotic nucleus are also studied. The effects of the proton halo on the electron scattering form factors are analyzed. The form factors of the exotic unstable 8B nucleus are compared with those of the stable 10B nucleus. The differences between the results of unstable 8B and stable 10B nuclei come from the long tail in the density distribution of the last proton.

Elastic transverse electron scattering form factors of 11Li exotic nucleus

The elastic transverse electron scattering form factors have been studied for the 11Li nucleus using the Two- Frequency Shell Model (TFSM) approach. The single-particle wave functions of harmonic-oscillator (HO) potential are used with two different oscillator parameters bcore and bhalo. According to this model, the core nucleons of 9Li nucleus are assumed to move in the model space of spsdpf. The outer halo (2-neutron) in 11Li is assumed to move in the pure 1p1/2, 1d5/2, 2s1/2 orbit. The shell model calculations are carried out for core nucleons using the spsdpf-interaction. The elastic magnetic electron scattering of the stable 7Li and exotic 11Li nuclei are also investigated through Plane Wave Born Approximation (PWBA). It is found that the difference between the total form factors of unstable isotope (11Li halo) and stable isotope 7Li is in magnitude. The measured value of the magnetic moment is also reproduced.

Quadrupole moment of 14B exotic nucleus

The quadrupole moment of 14B exotic nucleus has been calculated using configuration mixing shell model with limiting number of orbital's in the model space. The core- polarization effects, are included through a microscopic theory which considers a particle-hole excitations from the core and the model space orbits into the higher orbits with 6ħω excitations using M3Y interaction. The simple harmonic oscillator potential is used to generate the single particle wave functions. Large basis no-core shell model with (0+2)ћω truncation is used for 14B nucleus. The effective charges for the protons and neutrons were calculated successfully and the theoretical quadrupole moment was compared with the experimental data, which was found to be in a good agreement.

Matter density distribution and longitudinal form factors for the ground and excited states of 17Ne exotic nucleus

The two-frequency shell model approach is used to calculate theground state matter density distribution and the corresponding rootmean square radii of the two-proton17Ne halo nucleus with theassumption that the model space of 15O core nucleus differ from themodel space of extra two loosely bound valence protons. Twodifferent size parameters bcore and bhalo of the single particle wavefunctions of the harmonic oscillator potential are used. Thecalculations are carried out for different configurations of the outerhalo protons in 17Ne nucleus and the structure of this halo nucleusshows that the dominant configuration when the two halo protons inthe 1d5/2 orbit (15O core plus two protons halo in pure 1d5/2 orbit). Thecalculated matter density distribution in terms of the two-frequencyshell model is compared with the calculated one in terms one sizeparameter for all orbits to illustrate the effect of introducing one ortwo size parameters in calculations. The longitudinal form factors forelastic C0 and inelastic C2 electron scattering from 17Ne nucleus arecalculated for the considered configurations and for three states ofeach configuration which are the ground state ( JT  1 2 3 2 ) andthe first two excited states ( JT  3 2 3 2 ) and ( JT  5 2 3 2 ).The electric transition strengths B(C2) are calculated for the excitedstates and for the effective nucleon charges which are used in thiswork and compared with the experimental values.

Persistence of magicity in neutron-rich exotic 78Ni in ground as well as excited states

Recent experimental observation of magicity in [Formula: see text]Ni has infused the interest to examine the persistence of the magic character across the [Formula: see text] shell gap in extremely neutron-rich exotic nucleus [Formula: see text]Ni in ground as well as excited states. A systematic study of Ni isotopes and [Formula: see text] isotones in ground state is performed within the microscopic framework of relativistic mean-field (RMF) theory and the triaxially deformed Nilsson–Strutinsky model (NSM). Ground state density distributions, charge form factors, radii, separation energies, pairing energies, single-particle energies and the shell corrections show strong magicity in [Formula: see text]Ni. Excited nuclei are treated within the statistical theory of hot rotating nuclei where the variations of level density parameter and entropy show significant magicity with a deep minima at [Formula: see text], which persists up to the temperatures [Formula: see text]1.5–2[Formula: see text]MeV and then slowly disappears with increasing temperature. Rotational states are evaluated and effect of rotation on [Formula: see text] ([Formula: see text]) isotones are studied. Our results agree very well with the available experimental data and few other theoretical calculations.

Spectroscopic study of β-delayed particle emission from proton-rich nucleus 23Si

The [Formula: see text]-delayed particle emission from the exotic nucleus [Formula: see text]Si has been studied using a detection system with silicon array and clover-type high-purity germanium (HPGe) detectors. The [Formula: see text]-delayed charged-particle spectrum and [Formula: see text]-ray spectrum were identified. The half-life of [Formula: see text]Si has been determined. A new [Formula: see text]-delayed proton branch with an energy of 3811[Formula: see text]keV was observed. The [Formula: see text]-delayed two-proton emission was confirmed.

The Nuclear Structure for Exotic Neutron-Rich of 42, 43, 45,47K Nuclei

In this paper the proton, neutron and matter density distributions and the corresponding root mean square (rms) radii of the ground states and the elastic magnetic electron scattering form factors and the magnetic dipole moments have been calculated for exotic nucleus of potassium isotopes K (A= 42, 43, 45, 47) based on the shell model using effective W0 interaction. The single-particle wave functions of harmonic-oscillator (HO) potential are used with the oscillator parameters b. According to this interaction, the valence nucleons are asummed to move in the d3f7 model space. The elastic magnetic electron scattering of the exotic nuclei 42K (J?T= 2- 2), 43K(J?T=3/2+ 5/2), 45K (J?T= 3/2+ 7/2) and 47K (J?T= 1/2+ 9/2) investigated through Plane Wave Born Approximation (PWBA). The inclusion of core polarization effect through the effective g-factors is adequate to obtain a good agreement between the predicted and the measured magnetic dipole moments.