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Eurasian Journal of Physics and Functional Materials

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Vol 3, No 2 (2019)
116-123 79
Abstract

The isobaric-analog resonancesfor nuclei around the neutron shell closures at N = 20, 50, 82 are treated in thefullyself-consistentDensityFunctionalplusContinuumQuasiparticleRandomPhaseApproximation (DF+CQRPA).The aim is to check how the self-consistency is preserved in the calculations for long isotopic chains. The beta-decay half-lives and delayed multi-neutron emission branchingare calculated for the reference Ni isotopic chain. The relative contributions of the GT and first-forbidden transitions are compared with that of the relativistic QRPA and Finite Amplitude Method. The accuracy of the global beta decay calculations performed within FRDM+RPA, DF+CQRPA and RHB+QRPA models are analysed.

124-133 103
Abstract

Secondary beams (6Li,7Be,8B) were obtained by the separation of fragmentation products of a15N ion beam (50 MeV/A) impinging on a Be target using the COMBAS spectrometer. The secondary products were detected by a telescope consisting of five Si-detectors (dE) and a stop CsI(Tl) detector. The telescope allowed us to achieve unambiguous particle identification of fragments originating from incident secondary beams as well as their reaction products resulting from interaction with the Sidetectors, chosen as a secondary target. This way, break-up reactions of6Li,7Be and8B have been studied in this experiment, in particular the longitudinal momentum distributions of7Be fragments in the break-up of8B on a Si have been measured at 30 MeV/A.

134-138 91
Abstract

Preliminary results of measurements of the total reaction cross sections σR for nuclei4He,6He,8He,7Li,8Li,9Li,11Li,7Be,9Be,10Be,11Be,12Be,8B,10B,11B and12B nuclei at energy range (10-50) AMeV with28Si target is presented. The secondary beams of light nuclei were produced by bombardment of the 15N (50 AMeV) primary beam on Be target and separated by COMBAS fragment- separator. In dispersive focal plane a horizontal slit defined the momentum acceptance as 1% and a wedge degrader of 600 µm Al was installed. The Bρ of the second section of the fragment-separator was adjusted for measurements in energy range (10-45) AMeV. The strong absorption model reproduces the A-dependence of σR , but not the detailed structure. We are comparing our experimental data with predictions of microscopic (dashed line) and strong absorption model, Glauber multiple scattering theory and preliminary results are obtained.

139-144 83
Abstract

Specific linear structures in the region of a big missing mass in the fission fragments mass correlation distributions were revealed due to effective cleaning of this region from the background linked with scattered fragments. One of the most pronounced structures looks like a rectangle bounded by the magic nuclei. The fission events aggregated in the rectangle show a very low total kinetic energy. We propose possible scenario of forming and decay of the multi-cluster pre-scission configuration decisive for the experimental findings.

145-150 96
Abstract

It is shown that when the parent nucleus has nn Borromean halo structure, then after Gamow-Teller (GT) β -decay of parent state or after M1 γ -decay of Isobar Analogue Resonance ( IAR ) the states with np tango halo structure or mixed np tango + nn Borromean halo structure can be populated. Resonances in the GT β -decay strength function Sβ (E) of halo nuclei may have np tango halo structure or mixed np tango + nn Borromean halo structure. Demonstrated that the nuclei with Z/N ≈ 0.6 may correspond to the SU(4) region.

151-154 84
Abstract

Nuclear structure studies beyond132Sn on the shell evolution, the competition or coexistence of single- particle and collective structures and the GT strength are performedusing prompt and decay spectroscopy. Here, we present an overview of our recent data from such experiments on neutron-induced fission products in the mass chain A=136 using the EXILL and Lohengrin spectrometers at the ILL in the framework of other studies we have recently performed in the region around 132 Sn.

155-163 92
Abstract

The influence of charge components on emergence of a homogeneous phase of silicon in the process of silicon dioxide reduction by aluminium has been studied. Optimal process parameters affecting the quality of the end product have been identified. These include the ratio of components of the synthetic charge (CaO, SiO2 , CaF2 ), the optimal amount of SiO2 , the optimal amount of a reducing agent (Al) and the optimal Si/slag ratio. The homogeneous phase of silicon is easily separated from the slag, which contributes to the reduction of waste silicon during further technological operations.

164-173 96
Abstract

In this study the results of structural and morphological changes in Ni12+ heavy ion irradiated BeO ceramics are presented. Irradiation was carried out on DC-60 heavy ion accelerator using Ni12+ ions with an energy of 100 MeV with irradiation fluence of 1013 -1014 ions/cm2 . It has been determined that change in magnitude of atom displacements from lattice sites is exponential, which is conditioned by defect overlap regions occurrence at fluence of 1014 ions/cm2 , followed by formation of a large number of migrating defects in structure, leading to crystal structure distortion and deformation due to chemical bonds rupture. In case of defect overlap areas generation, characteristic for irradiation fluences of 5 × 1013 - 1014 ions/cm2 , amorphous inclusions formation of more than 5% was observed, that leads to thermal conductivity decrease by (15-20)%.

174-182 110
Abstract

Thin film of lithium phosphorus oxynitride (LIPON) was successfully deposited by radio frequency (RF) magnetron sputtering technique using a Li3PO4 target. The optimal deposition parameters were determined for the thin films with the highest target-substrate distance. Characterization of deposited film was carried out by AFM, FTIR and Raman spectroscopy, which showed incorporation of nitrogen into the film as both doubly, Nd , and possibly triply, Nt, coordinated form. The ac impedance spectroscopy measurements revealed that the highest ionic conductivity of 1.1 µScm-1 was achieved at room temperature for the samples prepared at the optimum RF power and gas flow conditions.

183-190 107
Abstract

We consider optical properties of 4 neutral hexacoordinated Si(bzimpy) 2 complexes, containing the 2,6- bis(benzimidazol-2 ′ -yl)pyridineligandusingDFTmethod. Thegeometricalparametersoftheoptimized cluster structures, the electronic absorption spectrum, and the molecular orbitals of the structures under consideration are discussed. The effect of addition of the substituents ligands to the of Si(bzimpy) 2 compound is considered. We found that succesive addition of substituents shifts HOMO and LUMO to higher values. The manipulation may provide desirable optical properties of the material.



ISSN 2522-9869 (Print)
ISSN 2616-8537 (Online)