Evidence of rigid triaxiality in some xenon nuclei

Singh, M. P.; Bihari, Chhail; Singh, Yuvraj; Varshney, Atul; Gupta, K. K.; Gupta, D. K.

doi:10.1139/p07-081

Cited by 12 publications

(10 citation statements)

References 20 publications

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“…The four-element alloys containing Al in the range of 0.02-0.05 wt % show lower i p and i cc values, thus indicating the stability of the passive film at this content. Singh et al 26 have also established that lower values of i p and i cc correspond to the stability and protective nature of the passive fillm. However, Al content Ͼ0.05 wt % increases the passivation current density ͑i p ͒, thereby destabilizing the passive film and resulting in a higher rate of corrosion of the alloy ͑low LPR value, Table I͒.…”

Section: Resultsmentioning

confidence: 95%

Potentiodynamic Polarization Measurement of Sn–8.5Zn–XAl–0.5Ga Alloy in 3.5% NaCl Solution

Mohanty

Lin

2006

J. Electrochem. Soc.

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The potentiodynamic polarization measurement of Sn-8.5Zn-XAl-0.5Ga alloy was carried out in 3.5% NaCl solution. The Al content in the alloy varied from 0.02-0.5 wt %. Addition of Al from 0.02 to 0.05 wt % decreased the corrosion current density and corrosion rate of the alloy. However, for Al content Ͼ0.05 wt % a significant increase in the corrosion rate and corrosion current density was observed. These changes were also noticed in the linear polarization resistance of the alloy. Auger depth profile and secondary ion mass spectrometry results revealed that the outer surface of the passive film was primarily composed of a high concentration of gallium oxide with a low concentration of zinc oxide. Aluminum oxide and tin oxide contributed a little to the formation of the passive film on the outer surface; however, it was present in the sputtered layers. An increase in the Al content to 0.5 wt % shifted the breakdown potential toward more negative values and facilitated the increased adsorption of Cl − ion in the passive layer. The presence of Cl − ion was responsible for the breakdown of the passive film.Lead-containing solder alloys, particularly tin-lead alloys, have been widely used in electronic industries for a long time due to low cost, good soldering properties, adequate melting temperature range, and proper physical, mechanical, metallurgical, and fatigueresistance properties. However, serious concerns on the toxicity of lead have led to an increase in the control and legislation on the use of lead. The use of lead in solders for electronics assembly has not been banned yet, but a strong trend of moving toward a green world is driving the industry to develop lead-free solder alloys with an immense enthusiasm. However, the new lead-free solder alloys which will be used in the electronic industry need to meet a variety of properties, such as good wettability, low melting point, low cost, adequate strength, good thermal fatigue resistance, etc. A number of investigations have been carried out on lead-free alloys such as Sn-Zn, 1-7 Sn-Ag and certain ternary systems such as Sn-Zn-In, 8,9 Sn-Ag-Cu, 10 Bi-Sb-Sn, 11 etc. Addition of Zn 12 to the Pb-free solder alloy results in good mechanical property and fatigue life. The presence of zinc in the solder alloy results in wettability decrease and poorer corrosion behavior of the alloy. The corrosion resistance of Zn has thus been improved by the addition of Al, 13,14 as in the case of conventional galvanized coatings for steel.Lin et al. 15 have studied the corrosion behavior of Sn-Zn-Al and Sn-Zn-Al-In 16 alloys by using potentiodynamic polarization techniques in 3.5% NaCl solution. In one study they found that SnZn-Al alloy underwent more active corrosion than 63Sn-37Pb alloy. In another study 16 they noticed that 5In-9͑5Al-Zn͒-Sn alloy was slightly more susceptible to corrosion than 10In-9͑5Al-Zn͒-Sn alloy. The polarization behavior of these two alloys were similar to that of 9͑5Al-Zn͒-Sn alloy. Recently Mohanty et al. 17 have investigated the effect of Al on the ...

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Section: Resultsmentioning

confidence: 95%

Potentiodynamic Polarization Measurement of Sn–8.5Zn–XAl–0.5Ga Alloy in 3.5% NaCl Solution

Mohanty

Lin

2006

J. Electrochem. Soc.

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“…strong interaction between the rotation and the g-vibrations [22]. Earlier some authors applied the Lipas Ansatz for evaluating perturbed energies in the triaxial rotation-vibration model in which a fixed value of a (Lipas parameter) is introduced [6] with the plea that Hilbert space is too limited to describe the full variation of the moment of inertia. Such corrections in energies were also applied earlier in the O (6) limit of the interacting boson model {IBM; O(6)} [23] and interacting boson approximation consistent Q formalism (IBA-CQF) [24,25] but remained partially successful.…”

Section: Discussionmentioning

confidence: 99%

“…1, 2a, and 2b) of these levels are calculated using relation (6) and are written in parenthesis (Table 1). Barium graphs (Figs.…”

Section: Prediction Of Some Energy Levels Of the G-bandmentioning

confidence: 99%

“…In the A *120-140 region where transition occurs from vibrator-like stretching around the neutron closed shell (N = 82) to a region with more rotational character (N = 66), energies and B(E2) values of the low lying states change slowly and smoothly with N and Z indicating the collective nature of the levels. The systematic investigation of such nuclei within an isotopic chain undergoing shape or phase transitions is of particular current interest in nuclear structure physics [2][3][4][5][6][7]. Asymmetry in even transitional nuclei around A *120-140 is a well established phenomenon [8].…”

Section: Introductionmentioning

confidence: 99%

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Ground and gamma band energy systematics in even xenon and barium nuclei

et al. 2010

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Rotation-vibration coupling parameter b at different spins is calculated on fitting the experimental energy for each nucleus in the framework of the General Asymmetric Rotor Model (Zhi. Phys. Rev. C, 51, 141 (1995)). Taking the even and odd spin energy sequences of the gamma band as separate bands besides the yrast band at large asymmetry (g 208), three values of the moment of inertia parameters a (a r , a e , and a o ) are calculated from the band head energies. A striking correlation in a and b versus the product of the number of valance protons and neutrons (NpNn) is obtained. These trajectories and the g versus NpNn correlation (Yan et al. Phys. Rev. C, 48, 1046) are capable of predicting the unknown energies of the ground and gamma bands of even xenon and barium nuclei, knowing only an external parameter NpNn. This introduces the possibility of a simpler description of the structural evolution of these transitional nuclei.Résumé : Nous calculons le paramètre b de couplage rotation-vibration en ajustant l'énergie expérimentale E ln pour chaque noyau dans le modèle du Rotateur Asymétrique Généralisé (GARM) (Zhi. Phys. Rev. C, 51, 141 (1995)). En prenant les séquences de spin pair et impair de la bande gamma comme deux bandes différentes à grande symétrie (g 208), nous calculons deux valeurs pour le paramètre a (a c et a 0 ) et une autre valeur a r pour la bande du fondamental à partir des énergies des têtes de bande. Nous obtenons une corrélation étonnante dans a et b versus N p N n , le produit du nombre de protons et de neutrons de valence. Ces trajectoires, avec la corrélation g -N p N n , (Yan et al. Phys. Rev. C, 48, 1046), permettent de prédire les énergies inconnues des bandes du fondamental et g même du Xe et du Ba, sous la seule connaissance du paramètre extérieur et N p N n , ce qui indique la possibilité d'une description plus simple de l'évolution structurelle de ces éléments de transition.[Traduit par la Rédaction]

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“…In these nuclei, protons in the valence shell begin to fill the shell, while the neutrons remain in the middle of that shell. Rotational alignment of these valence protons and neutrons trend to drive the nucleus towards prolate and oblate shapes, respectively [3]. Therefore, the nuclei lying in the above referred transitional region are good candidates for the study of various interesting phenomena, such as the effect of orbitals on deformation, investigation of shape changes, new excitations with regard to triaxial deformations, etc.…”

Section: Introductionmentioning

confidence: 99%

Evolution of intrinsic nuclear structure in medium mass even-even Xenon isotopes from a microscopic perspective *

et al. 2020

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In this study, the multi-quasiparticle triaxial projected shell model (TPSM) is applied to investigate -vibrational bands in transitional nuclei of . We report that each triaxial intrinsic state has a -band built on it. The TPSM approach is evaluated by the comparison of TPSM results with available experimental data, which shows a satisfactory agreement. The energy ratios, B(E2) transition rates, and signature splitting of the -vibrational band are calculated.

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Evidence of rigid triaxiality in some xenon nuclei

Cited by 12 publications

References 20 publications

Potentiodynamic Polarization Measurement of Sn–8.5Zn–XAl–0.5Ga Alloy in 3.5% NaCl Solution

Potentiodynamic Polarization Measurement of Sn–8.5Zn–XAl–0.5Ga Alloy in 3.5% NaCl Solution

Ground and gamma band energy systematics in even xenon and barium nuclei

Evolution of intrinsic nuclear structure in medium mass even-even Xenon isotopes from a microscopic perspective *

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