Canadian Journal of Physics最新文献

{"title":"Phase shift and cross section analysis of nucleon–nucleon and nucleon–nucleus scattering using second Pöschl–Teller potential","authors":"P. Sahoo, U. Laha","doi":"10.1139/cjp-2022-0317","DOIUrl":"https://doi.org/10.1139/cjp-2022-0317","url":null,"abstract":"In view of nuclear structure calculations, the second Pöschl–Teller potential is parameterized to study nucleon–nucleon and nucleon–nucleus elastic scattering. By exploiting the variable phase approach to potential scattering, phase parameters, cross sections, analyzing powers, etc., are computed and compared with earlier works. The calculated cross sections agree with the experiments below 25 MeV within the error bars for the (n-p) and (n-d) systems.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80232781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Traversable Wormhole Models Supported by a String Cloud in Rainbow Gravity","authors":"Umber Sheikh, S. Arshad, R. Pinčák","doi":"10.1139/cjp-2023-0054","DOIUrl":"https://doi.org/10.1139/cjp-2023-0054","url":null,"abstract":"The traversable wormholes are fascinating as the shortcuts in spacetime. This work discusses the geometry of a traversable wormhole with a string cloud as a source in rainbow gravity. The field equations are developed and solved to obtain the wormhole's shape function, cloud's mass density, and string tension. We have calculated the shape function and make it specific to study the dynamics for toy model. Based on the three well-known pairs of rainbow functions (mentioned by Ali and Khalil, 2015), the string cloud's dynamical variables including mass density and string tension are graphically presented. The corresponding energy conditions are also visually depicted. It is found that the source matter (string cloud) of the traversable wormhole must be exotic. However, the positive values of the string tension led to the presence of Casimir and dark energy effects. It is found that the toy model respects the null energy condition for a single pair of rainbow functions, i.e., Rainbow Function Type II. We have concluded that in rainbow gravity theory, the traversable wormhole solutions originating from a string cloud requires the presence of exotic matter to achieve a stable structure.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80640149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PROBLEM-BASED LEARNING APPLICATIONS IN ONLINE ENVIRONMENTS","authors":"A. Kumaş","doi":"10.1139/cjp-2022-0239","DOIUrl":"https://doi.org/10.1139/cjp-2022-0239","url":null,"abstract":"Online learning environments have been used intensively during the Covid 19 pandemic and are frequently preferred alternative learning environments afterward. On the other hand, the lack of adequate learning applications for online environments negatively affects teaching. The main purpose of this research is to develop Problem-Based Learning (PBL) activities for online learning environments within the scope of Physics course and to reveal the application processes. The study was carried out with 97 students in the fall semester of the 2020-2021 academic year. PBL applications were carried out in online learning environments with the interaction of online groups of 5-7 people through the Zoom program. A qualitative research approach and critical action research model were used in this research. The data were obtained with the help of rubric form, interview, peer assessment, peer group assessment and documents and evaluated with content analysis and descriptive analysis. In the process of PBL activities in online learning environments, students took an active role as a part of their learning processes, interacted constantly with their peers, and demonstrated high-level success in their learning competencies by fulfilling their responsibilities. In online learning environments, there is a need for application examples where all students can demonstrate their process skills and student-centered assessment-evaluation applications that will determine the application outputs.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85201907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ab initio study on the spectroscopic and radiative properties of lithium monocarbide","authors":"Mingxin Zhou, Shan Sun, Yufeng Gao, Zun-lue Zhu","doi":"10.1139/cjp-2022-0337","DOIUrl":"https://doi.org/10.1139/cjp-2022-0337","url":null,"abstract":"High-level electronic structure calculations were conducted for LiC molecule and compared to other theoretical results. The potential energy curves (PECs) for the 18 states originating from the first three dissociation channels of LiC molecule were calculated by the internally contracted multireference configuration interaction (icMRCI) method. The spectral constants, vibrational energy levels are reported. The transition properties for the a²Π, b²Δ, c²Σ^-, d²Σ⁺, and 2²Π states are discussed. In addition, the spin-orbit coupling (SOC) effects were taken into account in the electronic transition d²Σ⁺ - a²Π. The b²Δ and c²Σ^- states had radiative lifetimes of approximately 0.03-16.83 and 0.86-8.06 ms, respectively. The d²Σ⁺ and 2²Π states had radiative lifetimes of approximately 1.94 - 64.83 and 0.31 - 16.59 µs, respectively. Between these transitions, the emissions from the d²Σ⁺ - a²Π, 2²Π - c²Σ^-, 2²Π - b²Δ, and 2²Π - a²Π systems were strongest, while the emissions from the c²Σ^- - a²Π, b²Δ - a²Π, and 2²Π - d²Σ⁺ systems were weaker. The d²Σ⁺_1/2 state had radiative lifetimes of approximately 3.75 - 29.81 µs. Among the spontaneous emissions of the transitions generated by the d²Σ⁺_1/2 state, the emissions from the d²Σ⁺_1/2 - a²Π_1/2 and d²Σ⁺_1/2 - a²Π_3/2 systems were relatively strong and easily observed experimentally. The radiative lifetime variation law with the rotational quantum number for the d²Σ⁺_1/2 state at rotational quantum number J ≤ 70 and vibrational quantum number ν ≤ 15 is also presented in this paper. In addition, almost all the strong emissions of the transitions were distributed in the infrared region. It is expected that the results of this study will serve as a helpful reference for future experimental and theoretical studies.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80807833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Half-metallicity from CrCoSi and MnCoSi half-Heusler alloys to their derivative double half-Heusler CrMnCo2Si2","authors":"Hiba Elarabi, F. Khelfaoui, K. Boudia, F. Labani, M. Hamlat, Ouafaa Sadouki, F. Belkharroubi, F. Faid, A. Bouhemadou, B. Deghfel","doi":"10.1139/cjp-2022-0251","DOIUrl":"https://doi.org/10.1139/cjp-2022-0251","url":null,"abstract":"The structural, elastic, electronic, and magnetic properties of the CrCoSi, MnCoSi parent half-Heusler (HH) alloys, and their CrMnCo2Si2 derivative double half-Heusler (DHH) compound are studied, utilizing the augmented plane wave method, which is based on density functional theory and implemented in the WIEN2k code. The stability of HH structure of the CrCoSi and MnCoSi alloys has been checked for their non-magnetic and ferromagnetic phases, leading to that the latter phase of the type I arrangement is the most stable. The CrMnCo2Si2 DHH alloy, derivative from the found structural and magnetic ground states of CrCoSi and MnCoSi HH alloys, is constructed and investigated. This DDH as well as its CrCoSi parent HH are found to be resistant to deformation and can be classified as ductile materials, whereas the MnCoSi compound is brittle. By the gradient generalized approximation (GGA), the electronic structures of CrCoSi, MnCoSi, and CrMnCo2Si2compounds exhibit a metallic behavior in the spin-up channel and a semiconducting behavior in the spin-dn channel, with band gaps (half-metallic gaps) of 0.851(0.020), 0.852(0.021), and 0.531(0.002) eV, respectively. The half-metallicity of CrMnCo2Si2 DHH is retained with smaller (larger) band gap (half-metallic gap) of 0.38(0.106) eV than that of GGA, using GGA + U approximation. In addition, the total magnetic moments are found to be 1, 2, and 3 µB for CrCoSi, MnCoSi, and CrMnCo2Si2, respectively. Therefore, these alloys can be good candidates for spinitronic applications due to their half-metallicity.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83443426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Entanglement Entropy of Compton Scattering with a Witness","authors":"Shanmuka Shivashankara","doi":"10.1139/cjp-2023-0142","DOIUrl":"https://doi.org/10.1139/cjp-2023-0142","url":null,"abstract":"Unitarity and the optical theorem are used to derive the reduced density matrices of Compton scattering in the presence of a witness particle. Two photons are initially entangled wherein one photon participates in Compton scattering while the other is a witness, i.e. does not interact with the electron. Unitarity is shown to require that the entanglement entropy of the witness photon does not change after its entangled partner undergoes scattering. The final mutual information of the electron and witness particle's polarizations is shown to be nonzero for low energy Compton scattering. This indicates that the two particles became correlated in spite of no direct interaction. Assuming an initial maximally entangled state, the change in entanglement entropy of the scattered photon's polarization is calculated in terms of Stokes parameters. A common ratio of areas occurs in the final reduced density matrix elements, von Neumann entropies, Stokes parameter, and mutual information. This common ratio consists of the Thomson scattering cross-section and an accessible regularized scattering area.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84582055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of fluorine and chlorine doping on the structural, electronic and optical properties of SnO2 : First-principles study","authors":"F. Larbi, S. Bourahla, S. Kouadri Moustefai, F. Elagra","doi":"10.1139/cjp-2022-0295","DOIUrl":"https://doi.org/10.1139/cjp-2022-0295","url":null,"abstract":"In this work, we carried out in depth the structural, electronic and optical properties of intrinsic, fluorine (F) and chlorine (Cl) doped SnO2, using a pseudo-potential plane-wave scheme in the framework of the density functional theory. We found that the substitution of oxygen by F or Cl elements slightly modified the crystalline parameters without altering the stability of SnO2 compounds. The doping of tin oxide by these two halogens is confirmed by the displacement of the Fermi level position to the conduction band. Consequently, the doped materials are strongly degenerate as illustrated by the Moss-Burstein shift: 2.310 eV and 2.332 eV for F:SnO2 and Cl:SnO2 respectively. On the other hand, the density of states and Mulliken population analysis show that the covalent character of Sn-O bond is maintained after doping, while Sn-X (X=F or Cl) formed bond reveals an ionic nature. In terms of optical properties after doping, intrinsic SnO2 exhibits low absorption while the doped ones are transparent in the visible range, making them more efficient in photovoltaic applications. Moreover, in the ultraviolet (UV) scale, pure and doped tin oxide compounds show better absorption, which may be beneficial for use in devices of protection against UV light and UV absorbers or sensors. Finally, the plasma frequencies of 28.22 eV, 29.16 eV and 27.67 eV for pure, F and Cl doped SnO2, respectively, were obtained.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87103891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurements of the L-shell x-ray emission of fluorinelike europium","authors":"D. Panchenko, P. Beiersdorfer, N. Hell, G. Brown, R. Kelley, C. Kilbourne, F. Porter","doi":"10.1139/cjp-2022-0041","DOIUrl":"https://doi.org/10.1139/cjp-2022-0041","url":null,"abstract":"Measurements of the L-shell x-ray emission of fluorinelike europium ions (Eu54+) were made under controlled laboratory conditions on the EBIT-I electron beam ion trap at Livermore using an x-ray calorimeter, extending such measurements to the middle of the rare earth elements. Comparing the calorimeter spectra with atomic data from the Flexible Atomic Code, we have identified and analyzed several prominent n = 3 → n = 2 transitions, including one two-electron, one-photon core changing transition and one electric quadrupole transition. We find that the measured energies are consistently up to several eV higher than predicted.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75886632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Boron Neutron Capture Therapy in the New Age of Accelerator-Based Neutron Production and Preliminary Progress in Canada","authors":"D. Dziura, Sana Tabbassum, Amanda MacNeil, D. Maharaj, R. Laxdal, O. Kester, M. Pan, H. Kumada, D. Marquardt","doi":"10.1139/cjp-2022-0266","DOIUrl":"https://doi.org/10.1139/cjp-2022-0266","url":null,"abstract":"Each year more than 3,000 Canadians are diagnosed with brain cancers like glioblastoma multiforme or recurrent head and neck cancers which are difficult to treat with conventional radiotherapy techniques. One of the most clinically promising treatments for these cancers is boron neutron capture therapy (BNCT). This procedure involves selectively introducing a boron delivery agent into tumor cells and irradiating them with a neutron beam, which kills the cancer cells due to the high-LET radiation produced by the 10B(n,α)7Li capture reaction. The theory of BNCT has been around for a long time since 1936, but has historically been limited by poor boron delivery agents and nonoptimal neutron source facilities. Although significant improvements have been made in both of these domains, it is mainly the advancements of accelerator-based neutron sources that has led to the expansion of over 20 new BNCT facilities worldwide in the past decade. Additionally in this work, PHITS (Particle and Heavy Ion Transport Code System) simulations, in collaboration with the University of Tsukuba, were performed to examine the effectiveness of the Ibaraki-Boron Neutron Capture Therapy (iBNCT) beam shaping assembly (BSA) to moderate a neutron beam suitable for BNCT at the proposed PC-CANS (Prototype Canadian Compact Accelerator-based Neutron Source) site, which uses a similar but slightly higher energy 10 MeV proton accelerator with a 1 mA average current. The advancements of compact acceleratorbased neutron sources in recent decades has enabled significant improvements in BNCT technologies, allowing it to become a more viable clinical treatment option.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72488479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of X-rays to interpret alloying effects on the 3d and 4s4p electron populations of nickel boron nitrogen metal matrix composites","authors":"O. K. Köksal","doi":"10.1139/cjp-2022-0336","DOIUrl":"https://doi.org/10.1139/cjp-2022-0336","url":null,"abstract":"For this experiment, the nickel-boron and nickel-boron-nitrogen alloys are created using the electrochemical deposition method. Utilizing energy dispersive X-ray methods, the nickel-boron and nickel-boron-nitrogen alloys are characterized. X-ray diffraction was used to examine the crystal structure of nickel-boron and nickel-boron-nitrogen alloys. An energy dispersed X-ray fluorescence spectrometer is used to gather X-ray photons from the present samples. The number of radiated X-ray photons from the present specimens is used to compute the Kβ/Kα intensity ratios. The theoretical Coulomb and Babushkin gauges are used to calculate the populations of the 3d and 4s4p electrons. The observed data imply that shielding effects from 4s3d orbitals, hybridization, changes in energy levels, and charge transfer mechanism may be the causes of the variance in 3d and 4s4p electron populations. In an effort to clarify the conclusions drawn as a result of all these computations, this study contrasts the results with those of pure nickel.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87883331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}