Ahmad Ajjaq | Gazi University (original) (raw)
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Papers by Ahmad Ajjaq
ACS sensors, Jan 31, 2024
Physica Scripta, Sep 19, 2023
Applied Surface Science, May 1, 2023
Materials today communications, Dec 1, 2021
Physical review, Aug 21, 2017
Constraints on couplings of several beyond-Standard-Model-physics scenarios, mediated by massive ... more Constraints on couplings of several beyond-Standard-Model-physics scenarios, mediated by massive intermediate particles including (1) an extra Z-prime, (2) a new light spin-1 boson, and (3) a charged Higgs boson, are placed via the neutrino-electron scattering channel to test the Standard Model at a low energy-momentum transfer regime. Data onνe − e and νe − e scattering from the TEXONO and LSND, respectively, are used. Upper bounds to coupling constants of the flavorconserving and flavor-violating new light spin-1 boson and the charged Higgs boson with respect to different mediator masses are determined. The relevant parameter spaces are extended by allowing light mediators. New lower mass limits for extra Z-prime gauge boson models are also placed.
Physical review, Feb 28, 2017
Neutrino-electron scattering is a purely leptonic fundamental interaction and therefore provides ... more Neutrino-electron scattering is a purely leptonic fundamental interaction and therefore provides an important channel to test the Standard Model, especially at the low energy-momentum transfer regime. We derived constraints on neutrino nonstardard interaction couplings depending on modelindependent approaches which are described by a four-Fermi pointlike interaction and unparticle physics model with tensorial components. Data onνe − e and νe − e scattering from the TEXONO and LSND experiments, respectively, are used. The upper limits and the allowed regions of scalar, pseudoscalar, and tensorial nonstandard interaction couplings of neutrinos are derived at 90% confidence level in both one-parameter and two-parameter analysis. New upper limits for tensorial unparticle physics coupling constants and mass parameters are also placed.
Applied Physics A, Aug 20, 2021
Cadmium-doped zinc oxide (Cd-doped ZnO) films were produced by economic facile chemical bath depo... more Cadmium-doped zinc oxide (Cd-doped ZnO) films were produced by economic facile chemical bath deposition method. The Cd doping content was adjusted as 1%, 3%, 5% and 7%. The structural, morphological and optical properties of the films were characterized by XRD, Raman, SEM and UV–Vis. The response in a carbon dioxide atmosphere was measured by varying the concentration up to 100 ppm at different working temperatures (30–250 °C). XRD measurements demonstrated that all synthesized films have a good crystallite structure with hexagonal wurtzite dominant phase. A large variety of nanostructures are randomly distributed over the films’ surfaces depending on Cd doping content as was manifested by the corresponding SEM images. From the transmittance analysis, an ultraviolet absorption edge corresponding to pure ZnO film undergoes a redshift with the increase in Cd content. The results from Raman spectra are in good agreement with the XRD results. From the gas sensing measurements, a high response toward 100 ppm CO2 gas was detected by 3% Cd-doped ZnO sensor (88.24% at 125 °C) with an acceptable response of 8.36% at room temperature, which exhibited the lowest response/recovery times as well as highest selectivity, stability and reproducibility. Changes in the CO2 gas sensing response as a function of Cd doping content are explained based on particle size, optical bandgap and surface images.
Journal of Alloys and Compounds, Aug 1, 2023
Sensors and Actuators B-chemical, Nov 1, 2022
AIP Conference Proceedings, 2017
The observation of neutrinoless double-beta decay (0νββ) would show that lepton number is violate... more The observation of neutrinoless double-beta decay (0νββ) would show that lepton number is violated, reveal that neutrinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 − 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely low backgrounds, at the level of ∼0.1 count /(FWHM•t•yr) in the region of the signal. The current generation 76 Ge experiments GERDA and the Majorana Demonstrator, utilizing high purity Germanium detectors with an intrinsic energy resolution of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in the 0νββ signal region of all 0νββ experiments. Building on this success, the LEGEND collaboration has been formed to pursue a tonne-scale 76 Ge experiment. The collaboration aims to develop a phased 0νββ experimental program with discovery potential at a half-life approaching or at 10 28 years, using existing resources as appropriate to expedite physics results.
Journal of Alloys and Compounds
Journal of Advanced Applied Sciences
Bulletin of Materials Science
ACS Applied Materials & Interfaces
Sensors and Actuators B: Chemical
AGU Fall Meeting Abstracts, Dec 1, 2016
ACS sensors, Jan 31, 2024
Physica Scripta, Sep 19, 2023
Applied Surface Science, May 1, 2023
Materials today communications, Dec 1, 2021
Physical review, Aug 21, 2017
Constraints on couplings of several beyond-Standard-Model-physics scenarios, mediated by massive ... more Constraints on couplings of several beyond-Standard-Model-physics scenarios, mediated by massive intermediate particles including (1) an extra Z-prime, (2) a new light spin-1 boson, and (3) a charged Higgs boson, are placed via the neutrino-electron scattering channel to test the Standard Model at a low energy-momentum transfer regime. Data onνe − e and νe − e scattering from the TEXONO and LSND, respectively, are used. Upper bounds to coupling constants of the flavorconserving and flavor-violating new light spin-1 boson and the charged Higgs boson with respect to different mediator masses are determined. The relevant parameter spaces are extended by allowing light mediators. New lower mass limits for extra Z-prime gauge boson models are also placed.
Physical review, Feb 28, 2017
Neutrino-electron scattering is a purely leptonic fundamental interaction and therefore provides ... more Neutrino-electron scattering is a purely leptonic fundamental interaction and therefore provides an important channel to test the Standard Model, especially at the low energy-momentum transfer regime. We derived constraints on neutrino nonstardard interaction couplings depending on modelindependent approaches which are described by a four-Fermi pointlike interaction and unparticle physics model with tensorial components. Data onνe − e and νe − e scattering from the TEXONO and LSND experiments, respectively, are used. The upper limits and the allowed regions of scalar, pseudoscalar, and tensorial nonstandard interaction couplings of neutrinos are derived at 90% confidence level in both one-parameter and two-parameter analysis. New upper limits for tensorial unparticle physics coupling constants and mass parameters are also placed.
Applied Physics A, Aug 20, 2021
Cadmium-doped zinc oxide (Cd-doped ZnO) films were produced by economic facile chemical bath depo... more Cadmium-doped zinc oxide (Cd-doped ZnO) films were produced by economic facile chemical bath deposition method. The Cd doping content was adjusted as 1%, 3%, 5% and 7%. The structural, morphological and optical properties of the films were characterized by XRD, Raman, SEM and UV–Vis. The response in a carbon dioxide atmosphere was measured by varying the concentration up to 100 ppm at different working temperatures (30–250 °C). XRD measurements demonstrated that all synthesized films have a good crystallite structure with hexagonal wurtzite dominant phase. A large variety of nanostructures are randomly distributed over the films’ surfaces depending on Cd doping content as was manifested by the corresponding SEM images. From the transmittance analysis, an ultraviolet absorption edge corresponding to pure ZnO film undergoes a redshift with the increase in Cd content. The results from Raman spectra are in good agreement with the XRD results. From the gas sensing measurements, a high response toward 100 ppm CO2 gas was detected by 3% Cd-doped ZnO sensor (88.24% at 125 °C) with an acceptable response of 8.36% at room temperature, which exhibited the lowest response/recovery times as well as highest selectivity, stability and reproducibility. Changes in the CO2 gas sensing response as a function of Cd doping content are explained based on particle size, optical bandgap and surface images.
Journal of Alloys and Compounds, Aug 1, 2023
Sensors and Actuators B-chemical, Nov 1, 2022
AIP Conference Proceedings, 2017
The observation of neutrinoless double-beta decay (0νββ) would show that lepton number is violate... more The observation of neutrinoless double-beta decay (0νββ) would show that lepton number is violated, reveal that neutrinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 − 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely low backgrounds, at the level of ∼0.1 count /(FWHM•t•yr) in the region of the signal. The current generation 76 Ge experiments GERDA and the Majorana Demonstrator, utilizing high purity Germanium detectors with an intrinsic energy resolution of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in the 0νββ signal region of all 0νββ experiments. Building on this success, the LEGEND collaboration has been formed to pursue a tonne-scale 76 Ge experiment. The collaboration aims to develop a phased 0νββ experimental program with discovery potential at a half-life approaching or at 10 28 years, using existing resources as appropriate to expedite physics results.
Journal of Alloys and Compounds
Journal of Advanced Applied Sciences
Bulletin of Materials Science
ACS Applied Materials & Interfaces
Sensors and Actuators B: Chemical
AGU Fall Meeting Abstracts, Dec 1, 2016