Al-Azhar University, Faculty of Science (Boys)Al-Azhar Bulletin of Science1110-253529Issue 1-B20180601INFLUENCE OF HALOGEN IONS ON PHYSICAL PROPERTIES OF SOME BORO-VANADATE GLASSES1106120710.21608/absb.2018.61207ENJournal Article20180208Some sodium boro-vanadate glasses containing various halogen ions (chlorine, bromine or iodine) were prepared by melting at 1000oC for 2hrs and annealed at 300oC for 3hrs. These glasses were characterized by measuring the experimental densities, dc conductivities and volume-magnetic susceptibilities. Then the empirical densities, experimental and empirical molar volume values, electrical activation energies, mass- and molar-magnetic susceptibilities as well as the total mass attenuation coefficients of all glasses were calculated.<br />It was found that, the activation energy decreased as the halogen content was increased which may be due to the increase in the mobility of sodium ions and the gradual formation of some terminal non-bridging halogens, in addition to the electron hopping process between different oxidation states of vanadium. It decreased also ongoing from chlorine to iodine that can be ascribed to the differences in ionic radii of halogen ions. Also, the decrease in activation energy may be due to the increase in the interstitial vacancies. This was confirmed by the density and the molar volume results.<br />It was supposed that the increase in the paramagnetic character of the studied glasses with the increase of halogen content may be due to the formation of VXO3 groups. Also, the magnetic properties were found to decrease as the ionic radius of the introduced halogen ions increased. This can be attributed to the increase in the internal vacancies through the network.<br />Correlations were established between the experimental values of both the activation energy and molar susceptibility with the calculated molar volume values of the studied glasses.<br />According to the results of the mass attenuation coefficients, it was found that, the sample contains 25 mol% NaI is the best one that can be used as -ray attenuator, but only at gamma-ray energies up to 356 keV.https://absb.journals.ekb.eg/article_61207_f59e001c850b87068b24b7f07fa58afa.pdfAl-Azhar University, Faculty of Science (Boys)Al-Azhar Bulletin of Science1110-253529Issue 1-B20180601NUCLEAR STAGGERING IN SUPERDEFORMED SIGNATURE PARTNERS IN A~190 REGION USING PARTICLE –ROTOR MODEL11296120810.21608/absb.2018.61208ENJournal Article20180207Five pairs of superdeformed (SD) signature partners in the mass region A~190 namely: 191Hg (SD2, SD3), 193Hg (SD1,SD2) , 193Hg (SD3,SD4), 191Tl (SD1,SD2) and 193Tl (SD1,SD2) are studied in version of particle – rotor model. We considered the odd-A nucleus as a system of three valence particles coupled to an even- even symmetric deformed core. The three extra core particles lie in high- j intruder orbital and occupy only two Nilsson levels with 1= 1 2 and 2= 3 2. There are four completely antisymmetric functions with K = 1 2 and K = 3 2 and only two basis functions . We diagonalized the 22 matrix of the total Hamiltonian and evaluated the excitation energies . Transition energies E, rotational frequencies ħ , dynamic J(2) and kinematic J(1)moments of inertia have been calculated . A very good agreement with the experimental data support the proposed model by calculating the 2. The bands exhibit the usual increasing of J(2) with ħ ω.<br />The I = 1 energy staggering in - ray transition energies presented in these odd- A SD nuclei has been examined by proposing a two staggering functions: the first one depending on the dipole transitions linking the two signature partners and the quadrupole transitions within each band and the second one depending only on the dipole transition energies linking the two signature partners. Our selected signature partners in Hg and Tl nuclei show large amplitude staggering pattern.https://absb.journals.ekb.eg/article_61208_5e02cd95e7e4c70216b3a6567bff2f7a.pdfAl-Azhar University, Faculty of Science (Boys)Al-Azhar Bulletin of Science1110-253529Issue 1-B20181101INVESTIGATION OF ENERGY STAGGERING, IDENTICAL TRANSITION ENERGIES AND SHAPE BEHAVIORS IN ROTATIONAL BANDS OF ACTINIDE NUCLEI BY USING SOFTNESS MODEL31446121510.21608/absb.2018.61215ENJournal Article20180724The nuclear two – parameters softness model has been used to calculate the energy levels of the ground state bands in even - even actinide nuclei namely228,230Th, 230-238 U,236-244Pu, 242-248 Cm, 248,250Fm and 252,254 No. For each band the optimum values of the softness parameter and the ground state moment of inertia are calculated by the fitting procedure between the calculated and the experimental excitation energies using a computer simulated search program. Very good agreement is found between the calculated and experimental data. The nuclear kinematic and dynamic moments of inertia have been calculated; a smooth gradual increase in both moments of inertia as function of rotational frequency was seen. The Δ I = 2 energy staggering index represents the finite difference approximation of fourth order derivative of the transition energies is extracted and examined. The transition energies in the ground state bands of 236U and 238U have quite identical energies within 2 KeV up to spin 24 ħ, which indicate that the phenomenon of identical bands is not restricted to superdeformed bands. The study indicates also that these conjugate pair of nuclei 236U and 238Uhave moments of inertia nearly identical. The potential energy surfaces for isotones 234Th,236Uand 238Pu are calculated and show rotational behavior mainly prolate deformed.https://absb.journals.ekb.eg/article_61215_9adc7741556a67d757ae722e9b498ed6.pdf