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Volume 11, No. 3, 2018, 1439 H

 English Articles

 

 

M1 and E2 Transitions in the Ground-State Levels of Neutral Tin

We have reported the magnetic dipole (M1) and electric quadrupole (E2) transition parameters such as transition energies, logarithmic weighted oscillator strengths and transition probabilities between the fine structure levels in the ground-state configuration of 5s25p2 for neutral tin (Sn I, Z=50) using the multiconfiguration Hartree-Fock approximation within the framework of the Breit-Pauli Hamiltonian (MCHF+BP). The results obtained for Sn I have been compared with other available results. Also, new results on oscillator strengths for Sn I have been presented.

 

Leyla Özdemir and Muhammed S. Şadoğlu

 

JJP, 2018, 11(3) ,  141-145

Study of Optical and Structural Properties of NiO Thin Films Prepared by Chemical Spray Pyrolysis (CSP) Method

In this study, NiO thin films with molarity of 0.1 M have been successfully deposited on glass substrates by chemical spray pyrolysis (CSP) technique at a substrate temperature of 400 oC and a deposited thickness of about 350 nm. The structural and optical properties of these films have been studied using Ultraviolet-visible (UV-Visible) spectroscopy and X ray diffraction (XRD). The absorbance and transmittance spectra have been recorded in the wavelength range of 300-900 nm in order to study the optical properties. The optical energy gap for allowed direct electronic transition was calculated using Tauc’s equation. ...

 

Mutaz S. H. Aljuboori
 

JJP, 2018, 11(3) ,  147-152

Comparison of Different Models of Size-Dependent Thermodynamic Properties of Nanoparticles

Surface and thermodynamic properties, such as enthalpy, cohesive energy, surface energy and melting point, of different materials (Ag, Au, Sn and In) were calculated theoretically in this study by using the following two models: firstly, the lattice vibration-based model (LVB) of surface atoms and secondly, the surface-to-volume atom ratio (SVA) model of the free surface nanoparticle material. In this work, the melting temperature and other thermodynamic properties of the modified model of the nanoparticles improved the calculated curve compared with that of the experimental data due to the effect of lattice volume. ...

 

Abdulrhman Kh. Suliman

JJP, 2018, 11(3) ,  153-160

Compton Scattering of Twisted Light
 

The variation of photonic orbital angular momentum in Compton scattering is analytically analyzed. We determine the scattering matrix of twisted light based on the fundamental conservation of orbital angular momenta. Numerical values for two different twisted light modes: Laguerre-Gaussian and Bessel-Gaussian, are generated and illustrated. Our analysis indicates that states of photonic orbital angular momentum are highly changeable at wide angle scattering but more consistent at small angle scattering.

 

Mazen Nairat and

David Voelz

 

JJP, 2018, 11(3) ,  161-166

Neon Soft X-Ray Yield Optimization from NX2 Dense Plasma Focus Device
 

The aim of this research is to study soft x-ray emission from NX2 plasma focus device with neon filling gas using the Lee model code and find the maximum value of soft x-ray yield by using the standard parameters of the device and then find the optimum combination of pressure and anode dimensions that gives the maximum value of soft x-ray yield. Many numerical experiments were carried out and we obtained the maximum value of soft x-ray yield (Ysxr) of (22.6 J) at a pressure of (2.9 Torr) by using the standard parameters of NX2 device. We found the optimum combination of pressure, anode length and anode radius (3 Torr, 2.1 cm and 2 cm), respectively, by reducing the anode length and increasing the anode radius. The soft x-ray yield increases to (26.01 J) with a corresponding efficiency of about 1.53%.

 

Walid Sahyouni and Alaa Nassif

JJP, 2018, 11(3) ,  167-172

Natural Radioactivity and Associated Radiation Hazards in Local Portland and Pozzolanic Cements Used in Jordan

Activity concentration of the natural gamma-emitting radionuclides (40K, 226Ra and 232Th) in at least forty samples of local Portland and Pozzolanic cement types is measured. The measurements were performed using gamma spectrometric techniques. The range of the mean specific activity (minimum and maximum values) due to all the three radionuclides is found. Radiological hazards of the different samples are estimated using five approaches; the representative level index, the external hazard index, the internal hazard index, the radium equivalent index and the absorbed dose rate. Some of the measured radiological hazard parameters are compared to similar parameters in different countries. ...

 

Mefleh S. Hamideen

 

JJP, 2018, 11(3) ,  173-179

Optical Constants Determination of Thermally-Evaporated Undoped Lead Iodide Films from Transmission Spectra Using the PUMA Method
 

0.7-μm thick lead iodide (PbI2) films thermally-evaporated on glass substrates held at different temperatures T_s (35-195 ℃) are studied. Typical observed X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) micrographs of such PbI2 films prepared at high substrate temperatures T_s (>100 ℃) were found to be crystalline with hexagonal 2H-polytypic structure with the c-axis perpendicular to the surface. The room-temperature normal-incidence transmittance T_exp (λ) of the PbI2 films has been measured as a function of spectral wavelength λ in the range 300-1100 nm and was used to retrieve the spectral dependence of their optical constants n(λ) and κ(λ) using the Pointwise Unconstrained Minimization Approach (PUMA) method. ...

 

Mahmoud H. Saleh

 

JJP, 2018, 11(3) ,  181-191

Radiological Risk Measurements Due to Natural Radioactivity of Building Stones Used in Jordanian Houses

The radiological risk from building stone interfaces in Jordanian houses was determined depending on gamma ray spectrometric techniques. Building stone samples collected from seven types mostly used in Jordanian houses have been analyzed for the naturally occurring radioactive radionuclides. The mean specific activities of 238U, 232Th and 40K were lower than 7.63±0.08, 2.77±0.12, 32.7±2.96 Bq/kg, respectively. The estimated radium equivalent activity (Raeq) in the stones was lower than 24.84±0.470 Bq/kg and the external and indoor hazard indices were also lower than unity. ...

 

H. Saleh,

M. Hamideen,

M. Al-Hwaiti and

S. Al-Kharoof

 

JJP, 2018, 11(3) ,  193-200

 Technical Note

 

 

Optical Properties of Chemically Synthesized Cadmium Sulphide for Solar Cell Applications

This paper presents the optical properties of chemically synthesized cadmium sulphide for solar cell applications. CdS nano-particles were synthesized with chemical route method using cadmium sulphate as cadmium ion source and thiourea as sulphide ion source. The prepared CdS nano-particles were characterized with XRD and SEM. Then, the prepared CdS was deposited on well cleaned glass substrate by thermal evaporation technique to obtain a film of 100 nm thickness. The film was optically characterized with UV-Visible spectrophotometer and FTIR Spectrometer. ...

 

M. A. SALAWU,

A. B. ALABI,

S. B. SHARAFA and

T. AKOMOLAFE

 

JJP, 2018, 11(3) ,  201-207