Quantum Many-Body System with Variable Effective Mass in Presence of Time-Dependent Relative Harmonic Interactions and Electric Filed.
Hadi
Sobhani
Physics Department, Shahrood University of Technology, Shahrood, Iran
author
Hassan
Hassanabadi
Physics Department, Shahrood University of Technology, Shahrood, Iran
author
text
article
2017
per
In this article, a quantum many body system is considered. Then two time-dependent interactions have been added to the system. Changing of the interactions are assumed in general form. After that, by using algebraic method, time evolution of this many body system is investigated. In order to study the time evolution, Lewis-Riesenfeld dynamical invariant and time evolution operator method have been used. Appropriate dynamical invariants are constructed and their Eigen values are derived as well as appropriate time evolution operators are constructed. At the end, a comparison has been done between the derived results in the article considering a special case.
Journal of Research on Many-body Systems
Shahid Chamran University of Ahvaz
2322-231X
7
v.
15
no.
2017
1
11
https://jrmbs.scu.ac.ir/article_13321_0525b9fd52cb4f218998d97de8f8a600.pdf
dx.doi.org/10.22055/jrmbs.2017.13321
Role of surface energy coefficients in fusion with weakly bound projectile
Omid
Naser Ghodsi
1Department of Physics, Faculty of Science, Mazandaran University, Babolsar, Iran
author
Seyyed
Amin Seyyedi
Department of Physics, Faculty of Science, Payame Noor University, Tehran, Iran
author
طاهره
قاسمی
دانشجو
author
text
article
2017
per
In the present study we are attempting to investigate the influence of surface energy coefficients ("γ-MS,γ-MN1976,γ-MN1995,γ-MSNew" ) on the fusion systems including weakly bound projectiles. This interaction potential is calculated using proximity potential AW95 as well as three body dynamic classical trajectory to calculate fusion cross section. Our obtained results reveal that among the four surface energy coefficients, "γ-MS" leads to a shallow potential compared to other sets of "γ" , whereas "γ-MN1976" leads to the deepest potential as well as the barrier height of potential of "γ-MN1976" is better agreement with experimental data. Also complete fusion cross section of "γ-MS" surface energy is better agreement with experimental data while in the incomplete fusion cross section, the "γ-MN1976" can reproduce the experimental data well.
Journal of Research on Many-body Systems
Shahid Chamran University of Ahvaz
2322-231X
7
v.
15
no.
2017
13
20
https://jrmbs.scu.ac.ir/article_13322_69780ba62f186b19191bb0d477e2fde2.pdf
dx.doi.org/10.22055/jrmbs.2017.13322
Astrophysical s-factor of (_4^7)Be (α,γ) (_6^11)C Radiative Capture Reaction
Hosein
Sadeghi
Physics Department, Faculty of Science, Arak University, Arak 8349-8-38156, Iran
author
Motahareh
Ghamary
1Physics Department, Payame Noor University, PO BOX 19395-3697 Tehran, Iran
author
Saeed
Mohammadi
Physics Department, Payame Noor University, PO BOX 19395-3697 Tehran, Iran
author
text
article
2017
per
Due to the importance of (_4^7)Be (α,γ) (_6^11)C capture reaction in nuclear and astrophysics physics, the present study not only introduces the obtained reaction, but its potential, cross section and reaction rate is also calculated. Finally, after the introduction and calculation of astrophysical S-factors, a quantity with energy less dependent into the cross-section in low energies range for primordial nucleosynthesis, astrophysical s-factor for the reaction in the energy range of 0MeV-10MeV about 0MeV-b - 0.14MeV-b was obtained. Then it was compared with the obtained experimental value by NACRE and obtained theoretical value by cluster potential model. alpha capture reaction, nucleosynthesis energies, AV18 potential, astrophysical S-factors
Journal of Research on Many-body Systems
Shahid Chamran University of Ahvaz
2322-231X
7
v.
15
no.
2017
21
31
https://jrmbs.scu.ac.ir/article_13323_dfcba3960d584d9e9445aa8a4c4091c9.pdf
dx.doi.org/10.22055/jrmbs.2017.16404.1143
Study of 100-106Ru isotopic chain in the three levels interacting boson model
Amir
Jalili Majarshin
Department of Physics, University of Tabriz, Tabriz 51664, Iran.
author
Hadi
Sabri
Faculty of physics, University of Tabriz, Tabriz,Iran
author
text
article
2017
per
In this paper, we have considered the energy levels and energy surfaces of nuclei located between the spherical and the gamma soft shapes. We have used a three levels spd-interacting boson model which are defined in the affine SU(1,1) algebra to describe both positive and negative parity states. The energy surfaces of 100-106Ru isotopes are determined via catastrophe theory and coherent states formalism in the U(5)-SO(9) transitional region of interacting boson model. The agreement between the theoretical prediction of model and the most recent experimental counterparts is acceptable. Also, the variation of the energy surface’s shapes suggest a second order shape phase transition in this isotopic chain. The values of the control parameters and also the shape of energy surfaces suggest 100Ru as the best candidate for the critical point of this transitional region.
Journal of Research on Many-body Systems
Shahid Chamran University of Ahvaz
2322-231X
7
v.
15
no.
2017
33
44
https://jrmbs.scu.ac.ir/article_13324_1a2fa81aff51a7ef2a6f1cb1fa98054d.pdf
dx.doi.org/10.22055/jrmbs.2017.13324
Synthesis of MoS2/MoO3 compound thin films using spray pyrolysis technique and investigation on annealing treatment effect on their physical properties
Mehdi
Adelifard
Faculty of physics, University of Damghan, Damghan, Iran
author
Mostafa
Jahandoost
Faculty memeber of Damghan University
author
text
article
2017
per
In this research the effect of substrate temperature and also annealing treatment at sulfur atmosphere on structural, surface morphological, optical, electrical and thermoelectrical properties of molybdenum trioxide/molybdenum disulfide (MoS2/MoO3) compound thin films were studied. The XRD patterns analysis indicated the formation of crystallite structure with two MoO3 orthorhombic and MoS2 hexagonal phases. After sulfurization process, the peaks of oxide phase disappeared and MoS2 single phase structure formed. FESEM images indicated surfaces that was coated uniformly with spherical shaped particles. All samples had an absorption coefficient about 104 cm-1 and their band gap energy after sulfurization significantly reduces in average from 2.60 to 1.55 eV. Hall effect data showed that MoS2 thin films had hole conduction type (in agreement to trend of variation of Seebeck coefficient) and also hole density in order of 1015 cm-3.
Journal of Research on Many-body Systems
Shahid Chamran University of Ahvaz
2322-231X
7
v.
15
no.
2017
45
56
https://jrmbs.scu.ac.ir/article_13325_04e408a27d56b4692c04a51f7827065b.pdf
dx.doi.org/10.22055/jrmbs.2017.13325
Growth of aligned Carbon Nanotubes by catalytic Chemical Vapor Deposition and vapor phase growth Methods
Mansour
Farbod
Department of Physics, Faculty of Science, Shahid Chamran University of Ahvaz, Iran
author
Hediyeh
Hashemikia
Msc student
author
Alireza
Kiasat
academic staff
/Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Iran
author
text
article
2017
per
In this work, Vertically aligned carbon nanotubes ( VA-CNTs) were grown by chemical vapor deposition (CVD) method using Iron-Molybdenum catalyst supported by Silicon (Si) substrate. Acetylene gas (C2H2) as the carbon source, argon (Ar) as the carrier gas, hydrogen (H2) for reduction of the nanoparticles and iron-molybdenum nanoparticles as the catalyst for the growth of carbon nanotubes have been used at temperature of 750 °C. The reaction was performed inside a tube furnace equipped by a quartz tube and gases injected with the certain flow rate into the reaction tube. At first, substrate was coated by a thin layer of iron-molybdenum nanoparticles by the soakage method. Also, Vertically aligned carbon nanotubes wer grown using vapor phase growth method on silicon substrate. The samples characterization was performed using a scanning electron microscopy (SEM, LEO 906E), Field Emission Scanning Electron Microscopy (MIRA3 TESCAN) and X-ray energy dispersive spectroscopy analysis (EDX). Raman spectroscopy was also used to confirm the presence of single-walled nanotubes
Journal of Research on Many-body Systems
Shahid Chamran University of Ahvaz
2322-231X
7
v.
15
no.
2017
57
64
https://jrmbs.scu.ac.ir/article_13326_cbab717d63b7a5129c56cb6b8603ad0f.pdf
dx.doi.org/10.22055/jrmbs.2017.13326
Ionization of the molecular targets using the coherent and incoherent ion beams
Ebrahim
Ghanbari Adivi
Department of Physics, Faculty of Sciences, University of Isfahan, Isfahan 81746-73441, Iran
author
text
article
2017
per
One of the important and interesting aspects of the ionization of the molecular targets using the ionic beams is the interference which occurs between the beams scattered from different molecular scattering centers. Experience has shown that the interference patterns occurred using the coherent and incoherent beams have some small but important differences with each other. The taking into account of the origin of these differences by theoretical approaches is usually difficult even impossible. In this research, a theoretical model is proposed to study the triple differential cross sections of ionization of hydrogen molecules by coherent projectile beams. In this model, the ionization cross section is obtained by a superposition of the partial cross sections in the two-effective-center (TEC) approximation with one and two Coulomb waves. The obtained results for collision of protons with hydrogen molecules are compared with experimental data. Comparison shows that the interference effects due to the superposition of the two partial amplitudes are in good agreement with the interference patterns observed for the coherent proton beam.
Journal of Research on Many-body Systems
Shahid Chamran University of Ahvaz
2322-231X
7
v.
15
no.
2017
65
75
https://jrmbs.scu.ac.ir/article_13327_d2f0712c5b2fe07485d1d4c40dc7ebf2.pdf
dx.doi.org/10.22055/jrmbs.2017.18949.1222
Theoretical Study of Opto-Electronic properties of Silafulleranes Using Density Functional Theory
Mohammad
Qasemnazhand
Amirkabir University Of Technology
author
Farah
Marsusi
Department of Physics, Amirkabir University of Technology
author
text
article
2017
per
In the following study the typical optical properties of silicon nanoparticles, known as Hydrogenated sila-Fullerene Clusters, have been evaluated using computer simulation.The density functional theory has been selected as theoretical technique, which has been shown in recent decade as a reliable quantum many body approximation in prediction of optical and electronic properties of materials. All calculations have been done using Gaussian software, under Linux operating system. Also, GaussView software has been applied as the graphical interface in our calculations. The Results show that there is a little change in the optical gaps versus the size of particles. It is found that the optical gaps of those isomers with jointed-hexagonal rings are a little larger than their corresponding counter parts.
Journal of Research on Many-body Systems
Shahid Chamran University of Ahvaz
2322-231X
7
v.
15
no.
2017
77
87
https://jrmbs.scu.ac.ir/article_13328_f9328fec8f9160a5818b9150019d2322.pdf
dx.doi.org/10.22055/jrmbs.2017.13328
Design of Nanoplasmonic Solar Cells based on Optical mode excitation
Arezoo
Firoozi
Department of Physics, Persian Gulf University, Bushehr, Iran
author
Ahmad
Mohammadi Eslami
Department of Physics, Faculty of Science, Persian Gulf University, Boushehr, Iran
author
text
article
2017
per
To enhance light absorption in thin film solar cells, we propose and investigate several approaches to design dielectric and plasmonic nanostructures for efficient excitement of numerous optical modes in the solar cells, leading to an increase in the number of absorbed photons within absorbing layer. Two-dimensional Finite Difference Time Domain (2D-FDTD) method is employed to model light interaction with the proposed structures and to investigate the effect of solar cell parameters on the optical modes excitation. It is shown that several optical modes can be excited and adjusted by placing one dimensional dielectric and plasmonic quasi-periodic nanogratings on top and at the bottom of the active layer, respectively.
Journal of Research on Many-body Systems
Shahid Chamran University of Ahvaz
2322-231X
7
v.
15
no.
2017
89
102
https://jrmbs.scu.ac.ir/article_13329_c264f4fd37c3ed7f665d439ac864254a.pdf
dx.doi.org/10.22055/jrmbs.2017.13329
Improving the heterojunction silicon solar cell efficiency by using GaP intrinsic layer
Nafiseh
Memarian
Faculty of Physics, Semnan University, Semnan, Iran
author
Mir Kazem
Omrani
دانشجوی دانشگاه سمنان
author
Mehran
Minbashi
دانشجوی دانشگاه سمنان
author
text
article
2017
per
In this article, the operations of heterojunction silicon solar cells were investigated theoretically. The studied structure is TCO/ a-SiC (P)/ GaP (i)/ a-Si (n)/ a-Si (n+)/ metal. In this study instead of using conventional structure, which uses an amorphous intrinsic layer, a GaP (Gallium Phosphate) layer is used as intrinsic buffer layer. Different models of this solar cell structure were simulated. The effect of various parameters such as work functions of front and back contacts, emitter and n-type amorous silicon layer carrier densities, emitter band gap, GaP buffer layer thickness, current- voltage curves and quantum efficiency has been studied. The optimum values for above mentioned quantities are presented based on the study results. Moreover the band structure of different cases is plotted. The results show that using a GaP intrinsic layer with 2.26 ev band gap and 1 micrometer thick, leads to the highest efficiency around 21.13% with Voc=1.52 V, Jsc=16.58 mA.cm-2 and FF= 84 %.
Journal of Research on Many-body Systems
Shahid Chamran University of Ahvaz
2322-231X
7
v.
15
no.
2017
103
112
https://jrmbs.scu.ac.ir/article_13330_0b2a3e143c8ba096c6f3ec51e58f8052.pdf
dx.doi.org/10.22055/jrmbs.2017.18151.1203