OXBASH Code Research Articles

STUDY MAGNETIC ELECTRON SCATTERING FORM FACTOR OF 24Mg ISOTOPE

The magnetic form factor of 24Mg isotope under inelastic electron scattering was subjected to computational scrutiny via the utilization of the Oxbash code. The endeavor involved elucidating energy levels intrinsic to this nucleus through the application of the shell model, wherein the model space encompassed zbm, psd, spsdpf, and sd configurations. In the context of the sd model, the investigation harnessed two pioneering USD-type Hamiltonians, denoted as USDC and USDI, in conjunction with tailored amendments to these interaction potentials, referred to as USDCm and USDIm. This study culminated in comprehensively juxtaposing all computational outputs with empirical data sources, including information extracted from the National Nuclear Data Center (NNDC) repository. Significantly, this systematic examination underscored a notable congruence between the derived computational outcomes and the empirical observations. This alignment became conspicuously pronounced subsequent to judicious adjustments made to the g-factors, specifying values of = 1.060 and = -0.060. The profound unity between the findings of this study and experimental data manifests as compelling evidence, substantiating the efficacy and precision of the employed interaction models. It implies a reliable capacity of these models in the precise computation of magnetic form factors M1, M2, and M3

Study of Nuclear Structure of 42-43 Ti isotopes by using F7MBZ & F742 interactions

In this work, The energy levels and lowered electric quadruple transition probability B(E2) were calculated with the use of the OXBASH code in the F7shell and the F7MBZ& F742 effective interaction for the 42-43Ti isotopes. All nucleon combinations in the) 0 7/2, 1 3/2, 0 5/2, and 1 1/2 ( orbits are included in the model space. Additionally, the shell model does a good in describing the invading states' energies. Computations have been done using effective interactions F7MBZ and F742 in full f7 space, As well as the shell model, Lowlying states, and binding energies computed, and it was found that the calculated rates of electric quadrupole transitions between the isotopes 42-43Ti were consistent with the existing experimental published data.

Proof for strong ascendancy of short range effects on inelastic form factors in some open fp-shell nuclei

Short range effects on inelastic C2 form factors in some open fp nuclei ([Formula: see text]Ti, [Formula: see text]Cr, [Formula: see text]Fe and [Formula: see text]Zn) have been researched. The charge densities in these isotopes have been also researched by the one and two particle components of cluster series using single-particle wavefunctions of the harmonic oscillator potential. The short range effects have been inserted into the two particle components of cluster series employing the Jastrow form correlation. The total form factors of isotopes under consideration arise from the model space and core-polarization participations. The one-body density matrix elements (which are needed for computing the model space transition charge density) of valence nucleons for the transition [Formula: see text] have been computed by accomplishment of shell model calculations using the OXBASH code with various interactions. The shape of Tassie model has been adopted for computing the core-polarization transition charge density. The present computations are reliant on b (oscillator parameter) and [Formula: see text] (correlation parameter), where these parameters have been created independently for each individual nucleus by fitting the computed elastic form factors to those of experimental ones. This study provides a proof for strong ascendancy of short range effects on the present calculations, where inclusion of short range correlations on computations seems to be required for performing a notable modification in the computed outcomes which sequentially causes to elucidate the experimental data astoundingly in the momentum transfer under consideration.

Study Magnetic Electron Scattering Form Factor of Magnesium 24Mg

The magnetic form factors (ML) of inelastic electron scattering of magnesium nuclei 24Mg were studied computationally using Oxbash code. The energy levels of this nucleus were calculated through the shell model and using the model space (ZBM, PSD,SPSDPF and SD). For SD used two novel USD-type Hamiltonians, USDC and USDI, as well as modifications to these interactions, USDCm and USDIm. All the calculated values that were studied were compared with the available practical data, and it was also based on the data of the NNDC website. This study showed agreement between the calculated results and the experimental data after changing the values of g-factors where they were (𝑔𝑙 𝑝= 1.060 and 𝑔𝑙 𝑛= -0.060).

Magnetic Dipole Moments, Occupation Numbers and Magnetic Form Factors of Some Neutron Rich Nuclei in sdpf-shell

In the sdpf shell model, static and dynamic characteristics of certain neutron-rich nuclei are measured by using the SDPF interactions: Magnetic dipole moments (𝜇), occupation numbers (occ#) and magnetic electron scattering form factors for the ground state, they are presented for some Vanadium (23V) and Manganese (25Mn) isotopes using radial wave functions for the single-particle matrix elements of harmonic-oscillator potential (HO). These isotopes are 48V (4 1+), 49V (7/2- 3/2), 50V (6+ 2), 53Mn (7/2- 3/2), 54Mn (3+ 2) and 56Mn (3+ 3). The calculations introduced with model space (MS) and core-polarization CP effects are included through effective g factors. In model space and with core-polarization effects, the magnetic transition probability B(M1) is also calculated. The calculations of one-body density matrix OBDM together with the interaction SDPFK are carried out in the sdpf-model space using the OXBASH code. The theoretical results of the 𝜇 moments agree with recent experimental data.

Energy Levels and B(E2) Calculation for 50Fe Isotope Using F754 and F7mbz Interactions

In this work was calculated energy levels and reduced electric quadrupole transition probability B(E2) for 50Fe isotope using OXBASH code within the 1f7/2 shell and using the F754 and F7mbz effective interaction. 50Fe isotope contain 6 proton and 4 neutron out side 40Ca core in shell. In general, an acceptable agreement was obtained for a number of energy levels, and the total angular momentum and ground state parity were matched for all these isotopes, also new energy levels were obtained that have no practical values so far.

Calculation of Charge Density, Charge Radii and Form Factor for some Exotic Calcium Isotopes Using OXBASH Code

This work is concerned to give information of shell model calculations, limited to fp-shell with an accuracy and applicability in the work. The form factors have been calculated for J+=0+,2+,4+,6+,8+ for each nuclei depending on charge density q≤3 fm-1 using the harmonic oscillator potential based on GX1A effective interaction with ep=1.16e and en=0.7e. For charge density, the differences between proton and neutron densities increased with neutron increase while neutron radius increased as neutron number increase as an extension of neutron densities outwards on the nuclear surface (3< r <6 fm) while a slight increase appears in interior region (r < 3 fm). The values of charge radii are obtained from the rms charge radii. The value of ( ) starts with an increase from (52Ca-0.313) to reach its highest value at (58Ca-0.397) because there is no size of the energy gap between the shell in isotopes (54, 56 and 58) while orbital is specified in 52Ca doubly-magic nucleus. The results are corresponding to the experimental results of an increase in radius

Study of High-spin States for 90,91,92Y Isotopes by Using Oxbash Code

Abstract: In this paper, calculations of 90,91,92Y isotopes have been performed by application of nuclear shell model in the Gloeckner (Gl) model space for two different interactions (Gloeckner (Gl) and Gloeckner pulse bare G-Matrix (Glb) using Oxbash code. The energy levels are compared and discussed with experimental data and based on our results, many predictions about spins and parity were observed between experimental states, in addition to the predictions of low-energy spectra and B (E2; ↓) and B (M1; ↓)) transitional strengths in the isotopes 90,91,92Y. These predictions were not known in the experimental data. Keywords: Energy levels, Transition probabilities, Oxbash code.

Statistical Fluctuations of Energy Spectra in the Isobar A = 68 Nuclei

Statistical fluctuations of nuclear energy spectra for the isobar A = 68 were examined by means of the random matrix theory together with the nuclear shell model. The isobar A = 68 nuclei are suggested to consist of an inert core of 56Ni with 12 nucleons in f5p-space (2p3/2, 1f5/2 and 2p1/2 orbitals). The nuclear excitation energies, required by this work, were obtained through performing f5p-shell model calculations using the isospin formalism f5pvh interaction with realistic single particle energies. All calculations of the present study were conducted using the OXBASH code. The calculated level densities were found to have a Gaussian shape. The distributions of level spacing P(s) and statistic for the considered classes of states, obtained with full Hamiltonian of f5pvh (absence of the off-diagonal Hamiltonian) calculations, showed a chaotic (regular) behavior and coincided well with the distribution of Gaussian orthogonal ensemble (Poisson). Moreover, these distributions were independent of spin (J) and isospin (T)

Study of the Electric Quadrupole Transitions in 50-51Mn Isotopes by Using F742pn and F7cdpn Interactions

The nuclear shell-model has been used to compute excitation levels of ground band and electric quadrupole transitions for 50-51Mn isotopes in f-shell. In the present study, f742pn and f7cdpn effective interactions have been carried out in full f-shell by using Oxbash Code. The radial wave functions of the single-particle matrix elements have been calculated in terms of the harmonic oscillator (Ho) and Skyrme20 potentials. The predicted theoretical results have been compared with the available experimental data; it has been seen that the predicted results are in agreement with the experimental data. From the current results of the calculations, many predictions of angular momentum and parities of experimental states have been made, and the energy spectra predictions of the ground band and B(E2; ↓) electric quadrupole transitions in 50-51Mn isotopes of the experimental data are not known yet. In the nuclear shell-model calculations framework, energy levels have been determined for 50-51Mn isotopes; new values of electric quadrupole transitions have been predicted in the studied results. This investigation increases the theoretical knowledge of all isotopes with respect to the energy levels and reduced transition probabilities.

Calculation of Energy Levels and Reduced Electric Quadrupole Transition Probability for &lt;sup&gt;22&lt;/sup&gt;F Isotope Using Oxbash Code

A study on the calculation of energy levels and reduced electric quadrupole transition probability for fluorine-22 isotope using Oxbash Code has been carried out. The shell model and OXBASH was used to calculate the energy levels and probability of quadratic transition B(E2) of the 22 F isotope in the SD region through PW, CWH active interactions. A comparison was made between the calculation results and the experimental data. The comparison shows considerable consistency with the experimental results. The total angular momentum of the ground level 4 + 1 was confirmed when comparing with the experimental values. A significant consistency was obtained for the calculated energy values MeV (1.734, 2.387, 2.946) with the available experimental values of the same angular momentum (1 + 1 ,12+,4 + 2 ). It can be concluded that the reduced transition probabilities B(E2) can be calculated using the PW, CWH reactions and OXBASH code.

Study of Nuclear Structure for 36Si Isotope by Using Shell Model with Several Interactions

In this study, the nuclear shell model was applied to calculate the energy levels and reduced electric quadruple transition probability B(E2) for 36Si isotope using the OXBASH code within (1d3/2, 2s1/2, 2p3/2, 1f7/2) model space and using (HASN, ZBM2 and VPTH) interactions, As this isotope contains eight neutrons outside 28Si core in the region and when comparing the results of this study with the values. Available process compatibility was acceptable. There was good agreement at level 2+1, and angular momentum and parity were confirmed for levels 4+, 6+, and for all interactions, and the value of B(E2) corresponds well with the only practical value available for the transition .

Metastable states from multinucleon excitations in Tl202 and Pb203

The excited level structures of $^{202}\mathrm{Tl}$ and $^{203}\mathrm{Pb}$, above the ${7}^{+}$ and $29/{2}^{\ensuremath{-}}$ isomers, respectively, have been studied. An isomer with ${I}^{\ensuremath{\pi}}={20}^{+}$ and ${T}_{1/2}=215(10)\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{s}$ has been established in $^{202}\mathrm{Tl}$, and the level scheme extended from $I=10$ to $20\phantom{\rule{0.16em}{0ex}}\ensuremath{\hbar}$ with the placement of fifteen new transitions. In $^{203}\mathrm{Pb}$, the ${I}^{\ensuremath{\pi}}=37/{2}^{+}$ state is established to be metastable, with ${T}_{1/2}=2.5(3)\phantom{\rule{4pt}{0ex}}\mathrm{ns}$. Levels in both nuclei arise from intrinsic excitations, with likely particle-hole character for the higher-lying states in $^{203}\mathrm{Pb}$. The ${20}^{+}$ isomer in $^{202}\mathrm{Tl}$ is most likely associated with a $\ensuremath{\pi}{h}_{11/2}^{\ensuremath{-}1}$ $\ensuremath{\bigotimes}$ $\ensuremath{\nu}({i}_{13/2}^{\ensuremath{-}2},{f}_{5/2}^{\ensuremath{-}1})$ configuration, while the $37/{2}^{+}$ state in $^{203}\mathrm{Pb}$ results from the excitation of five neutrons. Calculations, using both an empirical approach and the oxbash code, have been performed to aid in the description of the excited level structure.

Applying Nuclear Shell Model to Study Nuclear Structure for 18Ne by Using OXBASH Code

In this study, the shell model used to calculate energy levels and reduced electric quadruple transition probability B(E2) for 18Ne isotope using OXBASH code within the sd shell and using the KUOSD effective interaction.18Ne isotope contain two proton outside 16O core in shell (0d5/2, 1s1/2, and 0d3/2) . The results of the energy levels and values of B(E2) were reasonably consistent with the experimental data available.

Study of Nuclear Structure of 18F Isotope by using PW and CWH Interactions

In this study, the energy levels of the 18F and electrical transitions B(E2) were calculated by applying the shell model where the calculations were carried out in the SD model space and using the OXBASH code. The theoretical results were compared with the experimental.

Calculations of β-decay half-lives for neutron rich tin isotopes

Many of the nuclei made temporarily during r-process nucleosynthesis are currently inaccessible to experiment. Their properties, however, help determine the abundances of stable elements which we observe in the solar system. Beta decay half-lives and rates are among the most important of these properties. Nuclei with 50 ≤Z≤ 56 and 82 ≤ N ≤ 88 in the π(gdsh) ⊕ν(hfpi) valence space above the 132Sn core lie on or close to the path of astrophysical r-process flow. The even-N neutron-rich Sn isotopes are the classical “waiting point” nuclei in the A=130 solar system abundance peak under typical r-process conditions. With respect to the r-process, N=86 isotope is an important waiting-point nucleus for moderate neutron densities to drive the r-process flow beyond A-130 peak. For such systems, the consideration of the three-body monopole effects is presently a relevant issue in nuclear structure calculations in order to reproduce their experimental studies. In the present work, the total β-decay half-lives and rates of the exotic Sn isotopes above the 132Sn core are calculated using monopole interaction at different temperatures. The calculation has been realized using Oxbash code in the frame work of the nuclear shell model.

Calculating Energy Levels in 25Mg/25Al Mirror Nuclei

&#x0D; &#x0D; &#x0D; &#x0D; Coulomb Displacement Energies in mirror nuclei 25Mg, 25Al have been calculated using shell model code OXBASH [1] and compared with experimental results. The code calculations were done in the USD model space with the W Hamiltonian [2]. The OXBASH code which is based on famous nuclear model, the shell model, deals with evaluating energy levels in nuclei. A comparison had been made between our results and the available experimental data [3] to test theoretical shell model description of nuclear structure in mirror nuclei. The energy states of mirror nuclei are almost identical, except for the small effects due to Coulomb interaction where the symmetry in being broken. Energy spectrum calculated with this code was in good agreement with the published experimental data [3].&#x0D; &#x0D; &#x0D; &#x0D; &#x0D;

Nuclear Electric Quadrapole Moments (Q) in &amp;lt;sup&amp;gt;58&amp;lt;/sup&amp;gt;Ni

Nuclear Electric quadrapole moments Q in 58Ni for some selected levels have been investigated and calculated through Nuclear shell model and considering of 56Ni as an inert core with two active neutrons in a model space (2p3/2, 1f5/2 and 2p1/2) and the configuration mixing of the original states is also done. F5Pvh interaction has been utilized as a two body interaction to generate model space vectors with harmonic oscillator potential as a single particle wave function. OXBASH code is used to carry this calculations and the program of Core, Valence, Tassie (CVT) written in FORTRAN go language to calculate the Electric quadrapole moments between excited states themselves. All of these calculations have been carried through model space vectors only. One body density matrix elements (OBDM) for ground and Excited states is calculated in order to carry the calculations using single particle Transition matrix elements between excited states theme selves.

English

Energy levels for (18F, 19F and 20F) isotopes have been studied within the framework of shell model using OXBASH code. In this work, the calculations are based on the Universal Sd-shell Hamiltonian (USDA) and W Hamiltonians for proton and neutron particle orbits in SDPN model space. The calculated energy levels and reduced electric quadrupole transition probabilities B(E2;&darr;) are in reasonably agreement with available empirical data. New energy levels have been predicted for all the isotopes in this work. Many unconfirmed experimental energy levels were confirmed by our calculations. &nbsp; Key words: Shell model, energy levels, OXBASH code, B (E2; &darr;).

Shell Evolution Effect on Odd A Antimony Isotopes in 132Sn Mass Region

Abstract . In order to understand the monopole interaction effect on the single particle energies and the shell evolution, we have studied Z=51 isotopes with odd mass number in the vicinity of 132Sn mass region. We have performed some spectroscopic calculations in the framework of nuclear shell model using kh5082 and mkh effective interactions in a truncated space, which is constructed taking into account the evolution of the effective single particle energies in the studied mass region. Keywords: Monopole interaction, Shell Evolution, Nuclear structure, Odd A Antimony isotopes, Oxbash code