NUMBER PROJECTED TWO-NEUTRON SEPARATION ENERGY IN THE NEUTRON-RICH RARE-EARTH REGION

2008 ◽  
Vol 17 (07) ◽  
pp. 1357-1365 ◽  
Author(s):  
N. BENHAMOUDA ◽  
N. H. ALLAL ◽  
M. FELLAH ◽  
M. R. OUDIH
Keyword(s):  
Rare Earth ◽  
Magic Number ◽  
Neutron Number ◽  
The Other ◽  
Neutron Separation Energy ◽  
Mean Square ◽  
Separation Energy ◽  
Important Variation ◽  
Neutron Rich Isotopes ◽  
The One

The variation of the two-neutron separation energy (S2N), as a function of the neutron number N, is studied using a microscopic model that includes the pairing effects rigorously within the Fixed-Sharp-BCS method. The model was first tested on "ordinary" nuclei and allowed one to suitably reproduce the experimental data and to confirm the results of previous studies. The model was then applied to the even–even neutron-rich isotopes in the rare-earth region and showed, on the one hand, a relatively important variation of S2N, when N = 100, that could lead to the assumption of the existence of a new magic number in this region, and on the other hand, a weak variation of S2N when N > 100. These findings corroborate the previously obtained results for the charge mean square radius and the quadrupole and hexadecapole moments within the same model.

scholarly journals RELATIVISTIC MEAN FIELD STUDY OF ISLANDS OF INVERSION IN NEUTRON-RICH Z = 17–23, 37–40 AND 60–64 NUCLEI

2013 ◽  
Vol 22 (04) ◽  
pp. 1350018 ◽  
Author(s):  
S. K. SINGH ◽  
S. MAHAPATRO ◽  
R. N. MISHRA
Keyword(s):  
Binding Energy ◽  
Periodic Table ◽  
Mean Field ◽  
Quadrupole Deformation ◽  
Neutron Separation Energy ◽  
Mean Square ◽  
Separation Energy ◽  
Relativistic Mean Field ◽  
Field Formalism ◽  
Analysis Of Binding Energy

We study the extremely neutron-rich nuclei for Z = 17–23, 37–40 and 60–64 regions of the periodic table by using axially deformed relativistic mean field formalism with NL3* parametrization. Based on the analysis of binding energy, two neutron separation energy, quadrupole deformation and root mean square radii, we emphasized the speciality of these considered regions which are recently predicted islands of inversion.

PARTICLE-NUMBER PROJECTED TWO-PROTON SEPARATION ENERGY OF THE PROTON-RICH EVEN–EVEN RARE-EARTH NUCLEI USING AN ISOVECTOR PAIRING APPROACH

2009 ◽  
Vol 18 (01) ◽  
pp. 141-160 ◽  
Author(s):  
S. KERROUCHI ◽  
D. MOKHTARI ◽  
N. H. ALLAL ◽  
M. FELLAH
Keyword(s):  
Rare Earth ◽  
Particle Number ◽  
Drip Line ◽  
Separation Energy ◽  
Line Position ◽  
Proton Separation Energy ◽  
Rare Earth Nuclei ◽  
Pairing Correlations ◽  
The One ◽  
Almost All

The two-proton separation energy (S2P) has been studied by describing the pairing correlations using four various approaches: in the pairing between like-particles case with (SBCS) and without (BCS) inclusion of the particle-number projection, as well as in the isovector pairing case with (NP-PROJ) and without (NP) inclusion of the particle-number projection. It has been numerically evaluated for the even–even rare-earth proton-rich nuclei such as Δnp ≠ 0. Among the four used methods, NP-PROJ is the one that provides the results that are closest to the experimental data when available. On the other hand, it has been shown that the S2P values deduced from the four approaches join, for almost all the considered elements, for the highest values of (N - Z). The fact that the BCS and NP (respectively, SBCS and NP-PROJ) values join may be explained by the fact that Δnp decreases with increasing values of (N - Z). It has also been shown that the BCS and SBCS (respectively, NP and NP-PROJ) values of S2P are very close because the discrepancy between the projected and unprojected energy values is quasi-constant as a function of the deformation. Finally, the four used methods lead to the same prediction of the two-proton drip-line position except for the Dysprosium and the Tungsten.

Geometrical analysis of self-compensating suspension systems for railcar engineering

2002 ◽  
Vol 216 (3) ◽  
pp. 185-196 ◽  
Author(s):  
F Sorge
Keyword(s):  
The Other ◽  
Mean Square ◽  
Geometrical Analysis ◽  
Suspension Systems ◽  
Longitudinal Plane ◽  
Articulated Systems ◽  
Gradient Type ◽  
The Mean ◽  
The One ◽  
Acceleration Component

The present analysis addresses several passive tilt systems for railroad cars aiming to compensate for the cart deficiency on curved tracks. To this end, the virtual centre of suspension must be located as close as possible to the longitudinal plane of symmetry of the coach, above the mass centre level for stability reasons. On the one hand, pantograph or Peaucellier's mechanisms may achieve the correct self-compensation. On the other hand, simpler articulated systems yield the desired goal with an excellent approximation. For example, selective algorithms can be applied for designing eight-link mechanisms, to be optimized thereafter by some method of the gradient type, minimizing the mean square value of the transverse acceleration component.

A systematic study of proton, alpha and cluster decays in Rhenium isotopes using the effective liquid drop model

2016 ◽  
Vol 31 (05) ◽  
pp. 1650031 ◽  
Author(s):  
Deepthy Maria Joseph ◽  
Nithu Ashok ◽  
Antony Joseph
Keyword(s):  
Rare Earth ◽  
Surface Potential ◽  
Systematic Study ◽  
Daughter Nucleus ◽  
Liquid Drop ◽  
Neutron Number ◽  
Liquid Drop Model ◽  
Rare Earth Nuclei ◽  
Neutron Rich Isotopes ◽  
Linear Nature

Employing the effective liquid drop model (ELDM), half-lives of proton and alpha decays and probable cluster decays are computed and analyzed for different proton-rich and neutron-rich isotopes of Rhenium. The investigation fortifies the phenomenon of cluster radioactivity (CR) in rare earth nuclei and also affirms the pivotal role played by neutron magicity in cluster decays. ELDM data is compared with that of universal decay law (UDL) model and found to be more efficient than the latter one. Apparently, cluster emissions slacken as the neutron number of daughter nucleus goes up and the linear nature of Geiger–Nuttall (G–N) plots stays unaltered even if the surface potential is incorporated.

Thermal two-neutron separation energy in the case of Erbium isotopes

2016 ◽  
Vol 25 (04) ◽  
pp. 1650028
Author(s):  
H. Kadi ◽  
N. Benhamouda
Keyword(s):  
High Temperature ◽  
Finite Temperature ◽  
Neutron Number ◽  
Neutron Separation Energy ◽  
Shell Effect ◽  
Shape Transition ◽  
Separation Energy ◽  
Shell Effects ◽  
Statistical Fluctuations ◽  
Gap Parameter

We propose to study the thermal two-neutron separation energy in the case of Erbium isotopes: 80 ≤ N ≤ 108. In this aim, one used the finite temperature Bardeen Cooper Schrieffer (FTBCS) method where the statistical fluctuations are treated as a part of Landau prescription. The behavior of this quantity according to the neutron number and temperature provides indication about the nuclear shape transition, and disappearance of shell effects. The obtained results allow to show that the inclusion of statistical fluctuations in the calculation have a nonnegligible effect. Indeed, the fact that this kind of fluctuations effect is important at high temperatures induces a smooth decrease of pairing gap parameter. As a consequence, the persistence of pairing effect at high temperature leads a change on the shell effect. Indeed, when statistical fluctuations are considered, the shell effect persists at high temperature which is not the case of the usual FTBCS approach.

scholarly journals Feasibility of the Bio-Mobilization of Rare Earth Elements from Bauxite Residual Red Mud

2021 ◽  
Vol 6 (1) ◽  
pp. 5
Author(s):  
Sadia Ilyas ◽  
Hyunjung Kim ◽  
Rajiv R. Srivastava
Keyword(s):  
Rare Earth ◽  
Citric Acid ◽  
Oxalic Acid ◽  
Red Mud ◽  
Penicillium Chrysogenum ◽  
The Other ◽  
Mode 2 ◽  
One Step ◽  
Mode 3 ◽  
The One

The present work was conducted to evaluate the bioleaching feasibility of red mud with Penicillium chrysogenum strain KBS3 in the presence of glucose, sawdust, and molasses as a substrate and in various leaching modes. The one-step bioleaching system involved 12 mM citric acid, 2.5 mM oxalic acid, 1.8 mM tartaric acid, and 1162 mM gluconic acid, with glucose as the substrate. The biogenic acid production in the two-step bioleaching system involved 15 mM, 1 mM, 0.5 mM, and 152 mM, respectively, and in the spent-medium bioleaching system, it was 63 mM, 29 mM, 23 mM, and 3 mM, respectively, using glucose as the substrate and a pulp density of 3%. The concomitant bio-mobilization of rare earths investigated under different modes were observed to be: 79% Y, 28% La, and 28% Ce in one-step (mode 1) bioleaching; 63% Y, and 28% both La and Ce in the spent-medium (mode 2) bioleaching; and 67% Y, 20% La, and 15% Ce in a two-step (mode 3) bioleaching. On the other hand, the bio-mobilization of rare eaths with molasses as the substrate was found to be: 57% Y, 13.5% La, and 12.7% Ce in mode 4 bioleaching; 57% Y, 14% La, and 12% Ce in mode 5 bioleaching; and 49% Y, 6.3% La, and 2.9% Ce in mode 6 bioleaching of the red mud. Insignificant results were observed using sawdust as the substrate.

NUCLEAR SHAPE PROPERTIES OF THE EVEN–EVEN NEUTRON-RICH RARE-EARTH NUCLEI

2005 ◽  
Vol 14 (02) ◽  
pp. 197-213 ◽  
Author(s):  
N. BENHAMOUDA ◽  
N. H. ALLAL ◽  
M. FELLAH ◽  
M. R. OUDIH
Keyword(s):  
Experimental Data ◽  
Rare Earth ◽  
Mean Field ◽  
Magic Number ◽  
Nuclear Shape ◽  
The Other ◽  
Shell Closure ◽  
Kink Effect ◽  
Prolate Shape ◽  
Rare Earth Nuclei

The physical properties of the nuclear shape have been investigated through the charge square radius (<r2>) and the quadrupole (Q2) and hexadecapole (Q4) moments of the even–even neutron-rich rare-earth nuclei. The single-particle energies used are those of a deformed Woods–Saxon mean-field. The pairing effects have been included by means of an exact projection method. The model has been tested for the "ordinary" nuclei near the shell closure N = 82 and has correctly reproduced the experimental data and particularly the "Kink" effect. The study has then been extended to the neutron-rich nuclei and has shown a stability of the <r2> and Q2 results for N≃100 which may be attributed to the existence of a new magic number. On the other hand, a saturation of the prolate shape appears around N = 108 for the elements Nd , Sm and Gd and near N = 102 for the Dy , Er and Yb . These observations could not be confirmed by the investigation of the hexadecapole moment.

Cotton Materials Grapped with Luminescent Organosilаzane Coatings

INEOS OPEN ◽  
2021 ◽  
Vol 3 ◽  
Author(s):  
E. N. Rodlovskaya ◽  
◽  
V. A. Vasnev ◽  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
The Other ◽  
Polymeric Coatings ◽  
Textile Materials ◽  
High Adhesion ◽  
Color Spectrum ◽  
The One ◽  
Hydrolysis Of

The textile materials with polymeric coatings bearing rare-earth element conjugates of variable color spectrum are obtained. The polymer basis in use is a new polyorganosilazane, which, on the one hand, features high adhesion to the material fibers and, on the other hand, hampers the hydrolysis of the REE conjugates during storage of the textile materials. It is shown that the duration of luminescent glow of the coatings on the surface of the textile materials reaches 8 h at the REE conjugate content in them ranging from 6 to 26 mmol.

Note on Selection of Coordinate Systems for Geodynamics

1975 ◽  
Vol 26 ◽  
pp. 395-407
Author(s):  
S. Henriksen
Keyword(s):  
Sea Level ◽  
The Other ◽  
Coordinate Systems ◽  
Mean Sea Level ◽  
The Earth ◽  
The One ◽  
Static Systems ◽  
Selection Of

The first question to be answered, in seeking coordinate systems for geodynamics, is: what is geodynamics? The answer is, of course, that geodynamics is that part of geophysics which is concerned with movements of the Earth, as opposed to geostatics which is the physics of the stationary Earth. But as far as we know, there is no stationary Earth – epur sic monere. So geodynamics is actually coextensive with geophysics, and coordinate systems suitable for the one should be suitable for the other. At the present time, there are not many coordinate systems, if any, that can be identified with a static Earth. Certainly the only coordinate of aeronomic (atmospheric) interest is the height, and this is usually either as geodynamic height or as pressure. In oceanology, the most important coordinate is depth, and this, like heights in the atmosphere, is expressed as metric depth from mean sea level, as geodynamic depth, or as pressure. Only for the earth do we find “static” systems in use, ana even here there is real question as to whether the systems are dynamic or static. So it would seem that our answer to the question, of what kind, of coordinate systems are we seeking, must be that we are looking for the same systems as are used in geophysics, and these systems are dynamic in nature already – that is, their definition involvestime.

Stories and the Self

2020 ◽  
Vol 32 (2) ◽  
pp. 47-58 ◽  
Author(s):  
Stefan Krause ◽  
Markus Appel
Keyword(s):  
Meta Analysis ◽  
The Self ◽  
The Other ◽  
Lower Degree ◽  
Contrast Effects ◽  
Self Perception ◽  
Self Perceptions ◽  
Other Hand ◽  
The One ◽  
Implicit And Explicit

Abstract. Two experiments examined the influence of stories on recipients’ self-perceptions. Extending prior theory and research, our focus was on assimilation effects (i.e., changes in self-perception in line with a protagonist’s traits) as well as on contrast effects (i.e., changes in self-perception in contrast to a protagonist’s traits). In Experiment 1 ( N = 113), implicit and explicit conscientiousness were assessed after participants read a story about either a diligent or a negligent student. Moderation analyses showed that highly transported participants and participants with lower counterarguing scores assimilate the depicted traits of a story protagonist, as indicated by explicit, self-reported conscientiousness ratings. Participants, who were more critical toward a story (i.e., higher counterarguing) and with a lower degree of transportation, showed contrast effects. In Experiment 2 ( N = 103), we manipulated transportation and counterarguing, but we could not identify an effect on participants’ self-ascribed level of conscientiousness. A mini meta-analysis across both experiments revealed significant positive overall associations between transportation and counterarguing on the one hand and story-consistent self-reported conscientiousness on the other hand.

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