The alpha ternary fission half-lives of thorium isotopes have been studied using the Coulomb and proximity potential models.The role of the deformation effects and the angle of orientation were included during the eva...The alpha ternary fission half-lives of thorium isotopes have been studied using the Coulomb and proximity potential models.The role of the deformation effects and the angle of orientation were included during the evaluation of the total potential.Fragment combinations were identified using cold valley plots of the driving potential.The half-lives and yields were evaluated using the penetration probability.The dependence of the logarithmic half-lives on different angles of orientation was studied.The evaluated alpha ternary fission yield was compared with that of the available experiments with and without deformations.The half-lives obtained in the present work were compared with those of the available data.Possible alpha ternary fission fragments were identified in the isotopes of thorium.The alpha ternary fission half-lives were compared to the binary fission half-lives.The binary fission half-lives are dominant in the ^(209-225)Th nuclei,and the ternary fission half-lives are dominant in the isotopes of the ^(226-238)Th nuclei.展开更多
Eu3＋-activated layered LnOCI （Ln=La and Gd） phosphors were synthesized by the conventional solid-state method at relatively low temperature （700 ℃） and shorter duration of 2 h. The structural parameters were ref...Eu3＋-activated layered LnOCI （Ln=La and Gd） phosphors were synthesized by the conventional solid-state method at relatively low temperature （700 ℃） and shorter duration of 2 h. The structural parameters were refined by the Rietveld refinement analysis and confirmed by the high resolution transmission electron microscopy （HRTEM）. Both the compounds were crystallized in the tetragonal structure with space group P4/nmm （No. 129）. The homogeneity of the elements were ana- lyzed by TEM mapping and found to be uniformly distributed. The photoluminescence spectra revealed that the intensity of 5D0--7F2 transition （619 nm） was more intense in Eu3＋-activated GdOC1 compared to LaOC1. This was due to the property of Gd3＋ ions to act as an intermediate sublattice to facilitate the energy transfer to Eu3＋ ions. Intensity parameters and radiative properties such as transition probabilities, radiative lifetime and branching ratio were calculated using the Judd-Ofelt theory. The CIE color coordinates result revealed that the Eu3＋-activated GdOC1 （0.641, 0.354） phosphor was close to the commercial red phosphors like, Y203：Eu3＋ （0.645, 0.347）, Y202S：Eu3＋ （0.647, 0.343） and National Television System Committee （NTSC） （0.67, 0.33）. The results suggest that the present GdOCI：Eu3＋ compound acts as a potential candidate for red phosphor materials.展开更多
文摘The alpha ternary fission half-lives of thorium isotopes have been studied using the Coulomb and proximity potential models.The role of the deformation effects and the angle of orientation were included during the evaluation of the total potential.Fragment combinations were identified using cold valley plots of the driving potential.The half-lives and yields were evaluated using the penetration probability.The dependence of the logarithmic half-lives on different angles of orientation was studied.The evaluated alpha ternary fission yield was compared with that of the available experiments with and without deformations.The half-lives obtained in the present work were compared with those of the available data.Possible alpha ternary fission fragments were identified in the isotopes of thorium.The alpha ternary fission half-lives were compared to the binary fission half-lives.The binary fission half-lives are dominant in the ^(209-225)Th nuclei,and the ternary fission half-lives are dominant in the isotopes of the ^(226-238)Th nuclei.
文摘Eu3＋-activated layered LnOCI （Ln=La and Gd） phosphors were synthesized by the conventional solid-state method at relatively low temperature （700 ℃） and shorter duration of 2 h. The structural parameters were refined by the Rietveld refinement analysis and confirmed by the high resolution transmission electron microscopy （HRTEM）. Both the compounds were crystallized in the tetragonal structure with space group P4/nmm （No. 129）. The homogeneity of the elements were ana- lyzed by TEM mapping and found to be uniformly distributed. The photoluminescence spectra revealed that the intensity of 5D0--7F2 transition （619 nm） was more intense in Eu3＋-activated GdOC1 compared to LaOC1. This was due to the property of Gd3＋ ions to act as an intermediate sublattice to facilitate the energy transfer to Eu3＋ ions. Intensity parameters and radiative properties such as transition probabilities, radiative lifetime and branching ratio were calculated using the Judd-Ofelt theory. The CIE color coordinates result revealed that the Eu3＋-activated GdOC1 （0.641, 0.354） phosphor was close to the commercial red phosphors like, Y203：Eu3＋ （0.645, 0.347）, Y202S：Eu3＋ （0.647, 0.343） and National Television System Committee （NTSC） （0.67, 0.33）. The results suggest that the present GdOCI：Eu3＋ compound acts as a potential candidate for red phosphor materials.
