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Articles 151 - 180 of 1382
Full-Text Articles in Physical Sciences and Mathematics
Emission Processes Of The Interaction Between The Quantum Well And Donor Delta Layer In Heterostructures For Phemts, Yana Ivanova, George Yakovlev, Vasily Zubkov, Anna Solomnikova
Emission Processes Of The Interaction Between The Quantum Well And Donor Delta Layer In Heterostructures For Phemts, Yana Ivanova, George Yakovlev, Vasily Zubkov, Anna Solomnikova
Turkish Journal of Physics
We present experimental and theoretical investigations of pHEMT heterostructures with AlGaAs/InGaAs/GaAs quantum wells (QWs) and/or a delta-doped layer, which can be used as active regions in transistors operating in the 4-18 GHz frequency range. Using the electrochemical capacitance-voltage setup ECV Pro we, for the first time, experimentally observed a concentration peak from the near-surface delta layer of the pHEMT structure together with a peak of QW enrichment. The capacitance of the electrolyte-semiconductor contact was measured by Agilent LCR-meter, which was connected to the electrochemical cell of ECV Pro through a specially designed relay module. Using numerical simulation of the electronic …
Effect Of Annealing Temperature On Structural, Electrical, And Uv Sensingcharacteristics Of N-Zno/P-Si Heterojunction Photodiodes, Şenol Kaya
Turkish Journal of Physics
The aim of this study is to investigate the influences of annealing temperature on initial device characteristics and their correlations with ultraviolet (UV) radiation sensitivity of n-type zinc oxide/p-silicon (n-ZnO/p-Si) heterojunction photodiodes. Evolutions on the crystalline structure, surface morphology, ideality factor, barrier potential, interface state density, and donor concentration were systematically analyzed during the initial device characterizations before testing the UV sensitivities of the photonic devices. The results demonstrate that the sensitivity of each n-ZnO/p-Si photodiode annealed at various temperatures was linearly correlated with different UV illumination intensities. The devices annealed at 750 ºC and 550 ºC exhibit more sensitive …
Reverse-Engineered Scalar Fields In A D-Dimensional Framework, Mustafa Salti, Oktay Aydoğdu, Hi̇lmi̇ Yanar
Reverse-Engineered Scalar Fields In A D-Dimensional Framework, Mustafa Salti, Oktay Aydoğdu, Hi̇lmi̇ Yanar
Turkish Journal of Physics
We are motivated to investigate the dynamics of scalar field dark energy proposals and focus on the reconstruction of a scalar field problem in a D-dimensional framework. With this purpose, we implement a correspondence between the tachyonic scalar field formulation and the additional dimensional cosmological scenario. Such connections help us to redefine the extra dimensional dynamics of the selected scalar field prescription.
Tracker-Aided Experiments For The Determination Of Viscosity Coefficients Of Liquidsusing The Communicating Vessels Method With Weighted Regression Analysis, Raden Oktova
Turkish Journal of Physics
Tracker-aided experiments using communicating vessels have been performed to determine the viscosity coefficients of liquids at room temperature with weighted linear regression analysis. The calculation involves weighted linear regression analysis of -ln[(2z1/z0) - 1] against time, where z1 and z0 are the instantaneous liquid level and the initial liquid level in one of the vessels with the higher initial liquid level, respectively, and a computer-aided χ2 goodness of fit test. Based on the maximum Reynolds number obtained, it is concluded that the liquid flow was laminar, as required by the theory. From the χ2 goodness of fit test it is …
Continuous Virasoro Algebra In Open String Field Theory, Syoji Zeze
Continuous Virasoro Algebra In Open String Field Theory, Syoji Zeze
Turkish Journal of Physics
It is known that the Takahashi-Tanimoto identity-based solution in open string field theory derives a kinetic operator which is a sum of twisted Virasoro generators. Applying the infinite circumstance description of conformal field theory, we derive continuous Virasoro algebra associated with the kinetic operator. Mode expansions of Virasoro generators and the modified BRST charge are given.
Precise Calculation Of Differential Cross Sections For The Z Boson Plus Jetsproduction In Proton-Proton Collisions At A Center-Of-Mass Energy Of 13 Tev, Kadi̇r Öcalan
Turkish Journal of Physics
The differential cross section predictions for the associated production of a Z boson and jets are presented in proton-proton collisions at a center-of-mass energy of 13 TeV. The differential cross sections are calculated by using a computational framework for the dielectron decay mode of the Z boson. Higher-order differential cross section predictions are obtained in the fiducial phase space and are compared at next-to-leading order (NLO) and next-to-NLO (NNLO) in perturbative quantum chromodynamics (pQCD). The predicted results are reported as functions of the variables including the jet multiplicity, the invariant mass of the Z boson, and transverse momenta of the …
Thermodynamic Properties Of V, Cr, Mo, And Fe Metals And Their Binary Alloys, Taiwo Akande, Fadeke Matthew-Ojelabi, Gbenga Agunbiade, Ebenezer Babatope Faweya
Thermodynamic Properties Of V, Cr, Mo, And Fe Metals And Their Binary Alloys, Taiwo Akande, Fadeke Matthew-Ojelabi, Gbenga Agunbiade, Ebenezer Babatope Faweya
Turkish Journal of Physics
The interactions between distinctive alloying elements have been scrutinized through atomistic investigation for essential material selection. The tight-binding model was applied to compute the thermodynamic properties of V, Cr, Mo, and Fe metals and their binary alloys. The calculated results agree with the accessible experiment in some cases, while some are closer in agreement with the experiment. The minimum formation enthalpies observed are -17.80, -15.20, -13.10, -11.50, and -0.90 eV for Cr-Mo, Cr-V, Fe-V, V-Fe, and Mo-Cr, respectively. The Cr-Mo alloy is the most stable of all the selected alloys with the least formation enthalpy. For the alloy structure, bcc …
Total Sunspot Number Calculation Based On Flare Production Potential Of Sunspot Groups: Reconstruction Of Ssn And Its Relation To Some Geomagnetic Indices, Ahmet Burak Karslioğlu, Burçi̇n Dönmez, Ali̇ Kilçik
Total Sunspot Number Calculation Based On Flare Production Potential Of Sunspot Groups: Reconstruction Of Ssn And Its Relation To Some Geomagnetic Indices, Ahmet Burak Karslioğlu, Burçi̇n Dönmez, Ali̇ Kilçik
Turkish Journal of Physics
In this study, we modified the previously introduced X-ray flare production potential (FPP) of each modified Zurich sunspot group based on its X-ray flare peak flux. Then, using these FPPs, the daily total sunspot number (Zurich number) calculation equation was modified; thus, new sunspot number data (CRz) were produced. We also compared ISSN and CRz with some geomagnetic indices (Dst, the maximum CME speed, and Ap indices). We found that the CRz data describe the geomagnetic indices quite well compared to ISSN. By using the regression equation between CRz and the sunspot area, the CRz dataset was recalculated back to …
Thz Applications Of Multimode Laser Diodes: A Review, Turgut Öztürk, Osamu Morikawa
Thz Applications Of Multimode Laser Diodes: A Review, Turgut Öztürk, Osamu Morikawa
Turkish Journal of Physics
Investigations are ongoing to develop cheaper THz time-domain spectroscopy (THz-TDS) systems. In this context, many studies have been published in which multimode laser diodes (MLDs) are used as light sources in THz- TDS systems. There is another method for cost-reduction. Photomixing employs two single-mode LDs and does not require a pulse laser, and then realizes a reduced-cost system. A comprehensive report has been presented by examining the work done up to now. In these studies, it has been shown that the characteristics of MLDs, the effects of antenna structures on THz signal production, the difficulty of collimation of the MLD …
Design And Test Of An Apparatus For Transient Measurements Of The Thermalconductivity And Volumetric Heat Capacity Of Solids, Florian Gather, Ekrem Güneş, Peter J. Klar
Design And Test Of An Apparatus For Transient Measurements Of The Thermalconductivity And Volumetric Heat Capacity Of Solids, Florian Gather, Ekrem Güneş, Peter J. Klar
Turkish Journal of Physics
Knowledge of the thermal conductivity (κ) of solids is crucial for all thermoelectric devices. A new approach in transient measurement to determine this value as well as electric conductivity (σ) and the Seebeck coefficient (S) is presented here. This approach can be combined with current steady-state methods. A cylindrical sample is mounted between two heat-flux sensors that can be heated or cooled at their outer ends. The input signals defining the heat fluxes at the sensors can be any arbitrary function of time, although some waveforms yield more valid results. The method is evaluated by employing a one-dimensional numerical model …
Modified Newton's Gravitational Law From Deformed Poisson Bracket, Ch'ng Han Siong
Modified Newton's Gravitational Law From Deformed Poisson Bracket, Ch'ng Han Siong
Turkish Journal of Physics
In this paper, we obtain the modified Newton's gravitational law from deformed Poisson bracket motivated by the generalized uncertainty principle. The modified Newton's gravitational law that we obtain contains a term that plays an important role only in the regime of first order in $\bar{\beta}$. In the ordinary situation or condition, the modified Newton's gravitational law reduces to the conventional Newton's gravitational law.
Various Paths To The Spontaneous Growth Of $P$-Form Fields, Fethi̇ Mübi̇n Ramazanoğlu
Various Paths To The Spontaneous Growth Of $P$-Form Fields, Fethi̇ Mübi̇n Ramazanoğlu
Turkish Journal of Physics
We show that $p$-form fields can go through spontaneous growth due to various couplings in gravity theories, forming a new example of spontaneous tensorization. Generalizing the spontaneous scalarization theory of Damour and Esposito-Farèse where the original idea has been applied to different fields from vectors to spinors has received high levels of interest in recent years. We first review this existing literature on spontaneous growth in gravity, and then apply the known mechanisms to $p$-forms. We show that one can induce spontaneous growth in $p$-forms for each of the regularized instability mechanisms, which was not the case for other types …
Ccd Ubv Ri Photometry Of The Open Cluster Berkeley 8, Hi̇kmet Çakmak, Raul Michel, Yüksel Karataş
Ccd Ubv Ri Photometry Of The Open Cluster Berkeley 8, Hi̇kmet Çakmak, Raul Michel, Yüksel Karataş
Turkish Journal of Physics
The poorly studied Berkeley 8 (Be 8) open cluster is analyzed from CCD U BV RI photometric data taken with the 0.90 m telescope at the Sierra Nevada Observatory. The Z = +0.008 PARSEC isochrone gave us a reddening of E(B-V) = 0.69 ± 0.03, a distance of 3410 ± 300 pc, and an age of 2.8 ± 0.2 Gyr. Its median Gaia DR2 distance, d = 3676 ± 810 pc, is in good agreement with our photometric distances, 3410-3620 pc within the uncertainties. The kinematic parameters of five likely members of Be 8 with the circular orbits, ecc = …
Elaboration And Study Of Structural And Optical Properties Of Aubr Nanocrystalsdispersed In Kbr Single Crystals, Hanane Zaioune, Fouzia Zehani, Noureddine Boutaoui, Badis Khennaoui
Elaboration And Study Of Structural And Optical Properties Of Aubr Nanocrystalsdispersed In Kbr Single Crystals, Hanane Zaioune, Fouzia Zehani, Noureddine Boutaoui, Badis Khennaoui
Turkish Journal of Physics
The structural and optical properties of the AuBr nanocrystals embedded in the KBr single crystals grown by the Czochralski method were studied using several techniques. The X-ray diffraction reveals their formation and incorporation. The crystallite average radii calculated from XRD using the Scherrer's formula was found to vary between 19 and 39 nm. The photoluminescence spectra obtained on these same samples present an emission band located at 1.91 eV (650 nm), which can be attributed to the orange luminescence of AuBr nanocrystals. However, the photoluminescence excitation measurements of these nanocrystals exhibit an excitation band located at 3.44 eV (360 nm), …
First Photometric Investigation Of Some Asas Binary Systems, Burak Ulaş
First Photometric Investigation Of Some Asas Binary Systems, Burak Ulaş
Turkish Journal of Physics
We present the first light curve solutions of the four binary systems observed and catalogued by the All Sky Automated Survey (ASAS) program. The light curves are analyzed by using PHOEBE software, which is based on the Wilson?Devinney method. The light curve parameters are derived and the estimated physical parameters are calculated from the result of the analyses. We compare our targets to well-known binaries of similar type on the Hertzsprung-Russell diagram and mass-radius plane. The evolutionary states of the components are also discussed.
Quality Control Of Silicon Pixel Wafers For The Cms Phase-1 Pixel Upgrade, Kamuran Di̇lsi̇z, Süleyman Durgut, Kai Yi, Leonard Spiegel
Quality Control Of Silicon Pixel Wafers For The Cms Phase-1 Pixel Upgrade, Kamuran Di̇lsi̇z, Süleyman Durgut, Kai Yi, Leonard Spiegel
Turkish Journal of Physics
The CMS detector at the CERN Large Hadron Collider features as its innermost component a silicon pixel detector. The original pixel detector was completely replaced during the 2016-2017 winter technical stop. One of the goals of this Phase-1 Upgrade of the pixel detector was to replace the sensors in the original CMS forward pixel detector with new, unirradiated sensors. The new CMS forward pixel detector must survive an integrated luminosity of 300 fb$^{-1}$ before being replaced again prior to the High-Luminosity LHC era. Just as in the original construction, the Phase-1 forward pixel sensors were made of n$^{+}$-in-n Diffusion Oxygenated …
Electroweak Decays Of Unflavored Mesons In Poincaré Covariant Quark Model, Vadzim Haurysh, Viktor Andreev
Electroweak Decays Of Unflavored Mesons In Poincaré Covariant Quark Model, Vadzim Haurysh, Viktor Andreev
Turkish Journal of Physics
This work presents the procedure for obtaining integral representation of the radiative decay constant in the Poincaré-covariant quark model, based on Poincaré-invariant quantum mechanics. In the course of the work the authors give numerical estimates of magnetic moments of the light quarks ($u,d,s$) from the $V\rightarrow P\gamma$ decay, based on the calculation method of the observer that was previously developed. This technique is generalized in the case of the decay $P\rightarrow V\gamma$ with further numerical calculation of mixing angles $\eta-\eta^{\prime}$ of pseudoscalar mesons. Within the framework of the offered approach, we obtain a self-consistent model that describes radiative and leptonic …
Second-Order Gauge-Invariant Perturbation Theory And Conserved Charges Incosmological Einstein Gravity, Emel Altaş Ki̇raci
Second-Order Gauge-Invariant Perturbation Theory And Conserved Charges Incosmological Einstein Gravity, Emel Altaş Ki̇raci
Turkish Journal of Physics
Recently a new approach in constructing the conserved charges in cosmological Einstein gravity was given. In this new formulation, instead of using the explicit form of the field equations, a covariantly conserved rank-four tensor was used. In the resulting charge expression, instead of the first derivative of the metric perturbation, the linearized Riemann tensor appears along with the derivative of the background Killing vector fields. Here we give a detailed analysis of the first-order and the second-order perturbation theory in a gauge-invariant form in cosmological Einstein gravity. The linearized Einstein tensor is gauge-invariant at the first order but it is …
Study Of A = 100-150 Superdeformed Mass Region By Using Two-Parameterformula, Vidya Devi, Jagjit Singh Matharu
Study Of A = 100-150 Superdeformed Mass Region By Using Two-Parameterformula, Vidya Devi, Jagjit Singh Matharu
Turkish Journal of Physics
Empirical formulae of rotational spectra consisting two parameters, such as single-term energy formula, E = aJb for spin J , and ab formula, were used to study the different features of superdeformed band in A = 100-150 mass region nuclei. The nuclear kinematic and dynamic moment of inertia for the ground-state rotational bands were calculated for this purpose and both showed gradual rise with rotational frequency. The study of ΔI = 2 staggering effects in the γ-ray energies, where the two sequences J = 4i; 4i + 1 and J = 4i + 2, (i = 0; 1; ...) are …
Effects Of Cooling Rate On The Atomic Structure And Glass Formation Process Of Co90 Zr10 Metallic Glass Investigated By Molecular Dynamics Simulations, Murat Çeltek, Sedat Şengül
Effects Of Cooling Rate On The Atomic Structure And Glass Formation Process Of Co90 Zr10 Metallic Glass Investigated By Molecular Dynamics Simulations, Murat Çeltek, Sedat Şengül
Turkish Journal of Physics
In this study, the atomic structure and the glass formation process of Co90 Zr10 metallic glass alloy were studied by molecular dynamic simulation based on the embedded atom method using four different cooling rates. The average atomic volume and the potential energy of the system were observed to be strongly dependent on the cooling rate during rapid solidification, and the glass transition temperature decreased with decreasing cooling rate. The radial distribution functions and the structure factors derived from molecular dynamics simulations at 300 K agreed well with the experimental and other molecular dynamics results. The coordination numbers calculated at 300 …
Effect Of Left-Handed Materials In Surface Plasmon Excitation And Propagationlength, Ari̇f Engi̇n Çeti̇n
Effect Of Left-Handed Materials In Surface Plasmon Excitation And Propagationlength, Ari̇f Engi̇n Çeti̇n
Turkish Journal of Physics
We investigated the dispersion relation of surface plasmons (SPs) excited in a medium comprised of a left-handed material (LHM) layer. We investigated different light polarizations in SP excitation along an LHM-metal interface. We studied SP excitation through a classical Kretschmann geometry, employing an LHM interlayer between a dielectric and a metal layer. Using this three-layer configuration, we investigated the effect of LHM medium on characterizing SP propagation length, which is directly related to the energy of the surface waves.
Autonomous Piston Engine Guided By The Transduction Of Radiation Pressure Inoptomechanical Brownian Motors, Yusuf Gül
Turkish Journal of Physics
We consider the autonomous piston engine in a coupled cavity scheme in an optomechanical setup. Treating the radiation field as working fluid, we investigate the transduction of virtual photons due to ground state excitations. Rabi-like energy splittings and Casimir effect are shown by avoided crossing in the eigenfunction spectrum. Second order coherence functions are employed to analyze the bunching of the cavity and mechanical mode in optomechanical implementation of Brownian motors. The imbalance in occupation numbers of the working modes is investigated for the power for work extraction. We explore the guidance of the radiation field in work extraction. We …
Lorentz-Violating Effects In Single W Boson Production At The Lhc, Serdar Spor, İnanç Şahi̇n
Lorentz-Violating Effects In Single W Boson Production At The Lhc, Serdar Spor, İnanç Şahi̇n
Turkish Journal of Physics
We investigate the Lorentz-violating effects of Standard Model Extension (SME) in single W boson production process pp → pγp → p W- q' X at the Large Hadron Collider (LHC). We employ the Weizsacker-Williams approximation for photons emitted from one of the incoming proton beams and consider γq → W- q' as a subprocess in the proton-proton collision. The behavior of the differential cross-section for various orientations of the constant background fields is obtained by taking into account longitudinal and transverse polarization states of the final W bosons.
Synthesis, Characterization, And Magnetic Properties Of Nanosizedzn0.5co0.5erxfe2-Xo4 Prepared By Coprecipitation Method, Zouheir Bitar, Doaa El-Said Bakeer, Ramadan Awad
Synthesis, Characterization, And Magnetic Properties Of Nanosizedzn0.5co0.5erxfe2-Xo4 Prepared By Coprecipitation Method, Zouheir Bitar, Doaa El-Said Bakeer, Ramadan Awad
Turkish Journal of Physics
In the present work, the effect of doping zinc cobalt ferrite by different concentrations of Er3+ on structural, optical, and magnetic properties was studied. Nanosized Zn0.5Co0.5ErxFe2-xO4 (0 ≤ x ≤ 0.2) was synthesized by the coprecipitation method. XRD analysis confirmed the formation of one phase face FCC spinel structure belonging to the Fd3m space group. TEM exhibited that the particle size decreased with the increase of Er3+ content, which is in agreement with XRD results. Two significant absorption bands from FTIR spectra were observed between 400 and 600 cm-1. The band gap energy value obtained from UV-Vis increased with the …
First- And Second-Law Thermodynamic Analyses Of A Combined Natural Gas Cyclepower Plant: Sankey And Grossman Diagrams, Mehmet Onur Karaağaç, Ahmet Kabul, Hasan Oğul
First- And Second-Law Thermodynamic Analyses Of A Combined Natural Gas Cyclepower Plant: Sankey And Grossman Diagrams, Mehmet Onur Karaağaç, Ahmet Kabul, Hasan Oğul
Turkish Journal of Physics
The natural gas combined cycle power plant is one of the best options for generating electricity due to its use of low carbon fuels, high efficiency, and operational flexibility. These plants consist of a combination of Brayton and Rankine cycles, and investigation of these cycles is performed in this paper. Here the parameters of pressure and temperature used in the calculations are taken from a combined cycle power plant. The net power output of the system at 25 °C ambient temperature and 101.325 kPa pressure was calculated as 45 and 12 MW for Brayton and Rankine cycles, respectively. In addition, …
Effect Of Al Doping On The Magnetic And Elastic Properties Of Fe65 Ni35 Invar Alloys, Asli Çakir
Effect Of Al Doping On The Magnetic And Elastic Properties Of Fe65 Ni35 Invar Alloys, Asli Çakir
Turkish Journal of Physics
Invar alloys have great importance due to their low thermal expansion coefficient. The effect of Al doping on Fe65 Ni35 Invar alloy was investigated by temperature-dependent magnetization and elastic modulus measurements. First, 0.44 at% and 2.24 at% of Al were substituted for Ni. Then X-ray diffraction measurements, Rietveld refinements, and scanning electron microscopy studies were performed to understand the effect of Al-doping on the face-centered cubic structure. The elastic modulus of Fe65 Ni35 and the Al-doped samples were measured in the temperature range 300 ≤ T ≤ 870 K using impulse excitation. The temperature dependence of magnetization and elastic modulus …
Enhanced Efficiency Of Cds/P3ht Hybrid Solar Cells Via Interfacial Modification, Sali̇h Yilmaz, İsmai̇l Polat, Murat Tomaki̇n, Ahmet Ünverdi̇, Emi̇n Bacaksiz
Enhanced Efficiency Of Cds/P3ht Hybrid Solar Cells Via Interfacial Modification, Sali̇h Yilmaz, İsmai̇l Polat, Murat Tomaki̇n, Ahmet Ünverdi̇, Emi̇n Bacaksiz
Turkish Journal of Physics
The present paper examines the effects of surface modification of CdS with diverse dyes on fabricated CdSbased hybrid solar cells. The X-ray diffraction results showed that CdS thin films had a hexagonal phase with a preferred orientation along the (101) plane. Scanning electron microscopy indicated that the CdS specimen was composed of a granular structure while a P3HT layer was formed from tiny grains. Band gaps of the CdS thin films and the P3HT layer were 2.45 eV and 1.98 eV, respectively. The absorption spectra showed that different dye loading caused an increase in the absorbance of CdS thin films …
On Memory Effect In Modified Gravity Theories, Ercan Kiliçarslan
On Memory Effect In Modified Gravity Theories, Ercan Kiliçarslan
Turkish Journal of Physics
In this work, we discuss the gravitational memory effect in higher derivative and infinite derivative gravity theories and give the detailed relevant calculations whose results were given in our recent works. We show that the memory effect in higher derivative gravity takes the same form as in pure GR at large distances, whereas at small distances, the results are different. We also demonstrate that, in infinite derivative gravity, the memory is reduced via error function as compared to Einstein's gravity. For the lower bound on the mass scale of nonlocality, the memory essentially reproduces the usual GR result at distances …
Pressure-Induced Structural Phase Transition And Electronic Structure Of In$_{1-X}$Ga$_{X}$P Alloys: A Dft Study, Kabita Khoirom, Indrajit Sharma, Brojen Singh, Ramkumar Thapa
Pressure-Induced Structural Phase Transition And Electronic Structure Of In$_{1-X}$Ga$_{X}$P Alloys: A Dft Study, Kabita Khoirom, Indrajit Sharma, Brojen Singh, Ramkumar Thapa
Turkish Journal of Physics
We present the density functional calculation to study the pressure-induced structural phase transition and electronic structure of In$_{1-x}$Ga$_{x}$P ($x =$ 0.0, 0.25, 0.5, 0.75, 1) alloys. We report the optimized structural parameters such as lattice constant, bulk modulus, and derivative of the bulk modulus of the alloys. Our calculation confirms that the alloys in the zinc-blende structure are more stable than in the rock-salt structure. The phase transition study from zinc-blende to rock-salt under pressure shows that the transition pressure increases with an increase in doping concentration. The energy band diagram of the alloys in the zinc-blende phase reveals a …
Determination Of Effective Resonance Energies For The $^{185}$Re(N,$\Gamma )^{186}$Re And $^{187}$Re(N,$\Gamma )^{188}$Re Reactions By Cadmium Ratio Method, Mustafa Güray Budak
Determination Of Effective Resonance Energies For The $^{185}$Re(N,$\Gamma )^{186}$Re And $^{187}$Re(N,$\Gamma )^{188}$Re Reactions By Cadmium Ratio Method, Mustafa Güray Budak
Turkish Journal of Physics
The effective resonance energy ($\bar{E}_{r})$ values for the $^{185}$Re(n,$\gamma )^{186}$Re and $^{187}$Re(n,$\gamma )^{188}$Re reactions were measured by using the cadmium ratio method. $^{197}$Au and $^{98}$Mo isotopes were selected as dual monitors to determine the epithermal neutron spectrum shape factor in the irradiation sites of a 37 GBq $^{241}$Am-Be neutron source. The analytical grade rhenium(VII) oxide samples were diluted with Al$_{2}$O$_{3}$ powder to reduce neutron self-shielding effects, and they were put into 1-mm thick small cylindrical polytetrafluoroethylene (PTFE) boxes. Samples were irradiated in a $^{241}$Am-Be neutron source. The activation produced in the irradiated samples was measured in close-counting geometry on the …