Indian Journal of Physics最新文献

{"title":"A detail investigation on quaternary, ternary, and binary fission of Nobelium","authors":"A. V. Mahesh Babu, N. Dhananjaya, H. C. Manjunatha, N. Sowmya","doi":"10.1007/s12648-024-03358-2","DOIUrl":"https://doi.org/10.1007/s12648-024-03358-2","url":null,"abstract":"<p>The quaternary, <span>(alpha)</span>-ternary, and binary fission of <span>(^{249-262})</span>No has been studied by considering the role of deformation and angle of orientation. identified by investigating driving potential, yield, and half-lives. The identified fission fragment combination from the cold-valley plot possesses nearly magic and magic numbers of either atomic/neutron numbers or both. The branching ratio of <span>(alpha)</span>-decay with respect to quaternary, <span>(alpha)</span>-ternary, and binary fission is studied. After rigorous investigation between different decay modes, it was is noticed that <span>(^{249})</span>No and <span>(^{261})</span>No undergo spontaneous fission. The quaternary fission of <span>(^{249-262})</span>No is the first of its kind that is not observed in the literature. Spontaneous fission half-lives of <span>(^{249})</span>No and <span>(^{261})</span>No posses shorter half-lives when compared to other possible decay modes such as quaternary fission, <span>(alpha)</span>-ternary, binary fission, alpha, and <span>(beta)</span>-decay. The half-lives of <span>(^{249})</span>No and <span>(^{261})</span>No are found to be 1.05<span>(times 10^{-2})</span>s and 123, respectively. We hope that the present work will lay the foundation for future investigations.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"3 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215906","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":"The effects of magnetic field on thermodynamic properties of alternating Heisenberg chain","authors":"Hamed Rezania","doi":"10.1007/s12648-024-03382-2","DOIUrl":"https://doi.org/10.1007/s12648-024-03382-2","url":null,"abstract":"<p>We study the effects of longitudinal magnetic field and temperature on the thermodynamic properties of one dimensional alternating Heisenberg antiferromagnet on the chain in the presence of dimerization parameter. In particular, the temperature dependence of specific heat have been investigated for various dimerization parameter and magnetic field strength in the model Hamiltonian. Using a hard core bosonic representation, the behaviors of thermodynamic properties have been studied by means of excitation spectrum of mapped bosonic gas. The effect of dimerization parameter, as the ratio between two types of exchange constants, on thermodynamic properties has also been studied via the bosonic model by Green’s function approach. Furthermore we have studied the magnetic field dependence of specific heat and magnetization for various dimerization parameters. At low temperatures, the specific heat is found to be monotonically increasing with temperature for magnetic fields in the gapped field induced phase region. We have found the magnetic field dependence of specific heat shows a monotonic decreasing behavior for various dimerization parameter due to increase of energy gap in the excitation spectrum. Also we have studied the dependence of magnetization on magnetic field for different dimerization parameters.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"6 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215909","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":"AC conductivity, dielectric and thermal properties of hybrid composite: bagasse cellulose carbon nanofibers composite","authors":"S. S. Ibrahim, Qamar Ommeish, Sherif A. Khairy, Mostafa A. Ibrahim","doi":"10.1007/s12648-024-03303-3","DOIUrl":"https://doi.org/10.1007/s12648-024-03303-3","url":null,"abstract":"<p>This study investigates the impact of incorporating carbon nanofibers (CNFs) into sugar cane cellulose at a high weight ratio (6 wt.%). Composite samples were prepared using a hot hydraulic press technique, and their thermal stability was analyzed through thermal gravitational analysis in a nitrogen environment. The results indicate that the cellulose-CNF composite exhibits a simplified single-stage decomposition compared to the more complex behavior observed in pure cellulose. FTIR analysis reveals the presence of –OH bonds, indicating enhanced hydrophilic properties in the composite. Dielectric spectroscopy, conducted over a frequency range of 100 Hz to 1 MHz, explores the effects of CNFs on the relaxation and conduction mechanisms at different temperatures. Parameters such as dielectric permittivity, AC conductivity, electrical modulus, and complex impedance were studied, incorporating Jonscher’s equation, and the Havriliak–Negami model. The interplay between interfacial charge and cellulose crystallinity emerged as a crucial factor in the observed dielectric behavior. Overall, this research provides insights into the thermal and dielectric properties of cellulose/CNF composites, offering potential applications in diverse fields.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"35 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215907","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":"Synthesis, structural studies and optical behavior of methylcellulose/CuO nanomaterials for optoelectronics","authors":"B. M. Alotaibi,&nbsp;Haifa A. Al-Yousef,&nbsp;A. Atta,&nbsp;E. Abdeltwab,&nbsp;M. M. Abdelhamid","doi":"10.1007/s12648-024-03218-z","DOIUrl":"10.1007/s12648-024-03218-z","url":null,"abstract":"<div><p>The polymer methyelcellouse (MC) is mixed with copper oxide (CuO) to form the MC/CuO composite using the solution casting approach for optoelectronic devices. The X-ray diffraction (XRD) analysis verified the successful preparation of the nanocomposite films. The XRD data reveals that the pristine film’s structural properties are improved after embedding CuO nanoparticles. The effects of CuO on the optical characteristics were examined. The pure MC had dispersion energy of 0.48 eV, while the MC with 3% CuO had 0.17 eV, the MC with 6% CuO had 0.07 eV, and the MC with 9% CuO had 0.03 eV. However, compared to MC, the oscillation energy E₀ modified from 3.86 for MC to 4.03, 4.22, and 4.77 eV, respectively. The optical properties of MC/CuO composites exhibited a notable enhancement compared to pure MC. This study focuses on developing flexible nanocomposite materials exhibiting unique properties that have potential use in high-performance optoelectronic devices.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 13","pages":"4473 - 4481"},"PeriodicalIF":1.6,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215908","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":"Modeling influence of temperature and magnetic field on the density of surface states in semiconductor structures","authors":"U. I. Erkaboev, N. Yu. Sharibaev, M. G. Dadamirzaev, R. G. Rakhimov","doi":"10.1007/s12648-024-03360-8","DOIUrl":"https://doi.org/10.1007/s12648-024-03360-8","url":null,"abstract":"<p>In this article, the physical properties of the surface of the CdS/Si(p) material under the influence of a magnetic field were studied. The dependence of the density of surface states of the p-type Si(p) semiconductor on the magnetic field and temperature has been studied. For the first time, a mathematical model has been developed to determine the temperature dependence of the density of surface states of a semiconductor under the influence of a strong magnetic field. Mathematical modeling of processes was carried out using experimental values of the continuous energy spectrum of the density of surface states, obtained at various low temperatures and strong magnetic fields, in the band gap of silicon. The possibility of calculating discrete energy levels is demonstrated.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"24 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947674","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":"Anisotropic star with a linear equation of state (EOS)","authors":"Rinkal Patel, B. S. Ratanpal, Ranjan Sharma","doi":"10.1007/s12648-024-03297-y","DOIUrl":"https://doi.org/10.1007/s12648-024-03297-y","url":null,"abstract":"<p>A new form of the equation of state (EOS) is considered to develop a model for describing the interior of a static, spherically symmetric, compact anisotropic star. The analytic solution is obtained using the Finch and Skea ansatz for the metric potential <span>(g_{rr},)</span> with a distinct geometric interpretation for the related background spacetime. The model parameters are fixed by matching the interior solution to the Schwarzschild exterior metric over the boundary of the star, together with the requirement that the radial pressure vanishes at the boundary. Data available for the pulsar 4<i>U</i>1802030 has been utilized to analyze the physical viability of the developed model. The model is shown to be stable.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"65 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947675","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":"Effect of deposition cycle and annealing on the structural, optical, electrical, and photoluminescence properties of SnS films obtained from rapid S-SILAR technique","authors":"Pawan Kumar, Gowrish K. Rao","doi":"10.1007/s12648-024-03349-3","DOIUrl":"https://doi.org/10.1007/s12648-024-03349-3","url":null,"abstract":"<p>In this paper, we present an optimized procedure for depositing SnS thin films using the rapid S-SILAR technique. We also analyze the effects of deposition cycles and post-deposition annealing on various film properties. XRD analysis indicates the presence of orthorhombic and cubic phases in the films. Energy dispersive X-ray analysis confirms near-optimal stoichiometry. SEM images depict the growth of closely spaced spherical granules. High optical absorption is observed in the mid-visible to NIR region, with the absorption edge shifting towards the NIR region after annealing. The bandgap values range from 1.6 eV to 1.9 eV, which is ideal for photovoltaic applications. PL spectra show three clusters of peaks corresponding to red and green emissions. Hall measurements confirm that both the as-deposited and annealed SnS films exhibit p-type conductivity, with a hole concentration on the order of 10¹⁵ cm⁻³.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"4 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947676","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":"Obliquely nonlinear solitary waves in magnetized electron–positron–ion plasma","authors":"L. Nazziwa, I. Habumugisha, E. Jurua","doi":"10.1007/s12648-024-03329-7","DOIUrl":"https://doi.org/10.1007/s12648-024-03329-7","url":null,"abstract":"<p>This study focused on nonlinear ion-acoustic solitary structures (IASS) in a magnetized plasma system that is kappa distributed comprising electrons, positrons, and ions (e–p–i) using a fluid theory approach. A novel nonlinear inverse dispersion relation peculiar to this complex plasma environment was derived. The dispersive properties of ion-acoustic waves in magnetized e–p–i plasma environment were investigated considering the influence of various superthermal of electrons and positrons <span>((kappa _{e}~textrm{and} ~kappa _{p}))</span>, unperturbed positron to ion density ratio, <i>p</i>, electron to ion density ratio, <span>((delta ))</span>, ion to electron temperature ratio, <span>((sigma ))</span>. By numerically analyzing the impact of plasma properties, particularly the nonlinear dispersion characteristics in a magnetized e–p–i plasma. The influence of the external magnetic field (obliqueness) angle, <span>(theta)</span>, which alters the frequency value of <span>((omega ^{2}))</span>. It was found that the values of <span>(delta)</span>, the frequency <span>(omega ^{2})</span> of IASS waves decreases with increasing <span>(delta)</span>. This result has significant implications for understanding the dynamics of various astrophysical settings, such as the solar wind. However, when <span>(delta &gt; 0)</span>, the curves become more nonlinear, indicating the waves become more dispersive. Further, it is discovered that as the value of <span>(theta)</span> for <span>(+~omega ^{2})</span> solution increases, the shape of the dispersion curve does not significantly change. In contrast, it is observed from the <span>(-~omega ^{2})</span> solution that for all values of angle <span>(theta)</span>, frequency decreases with increasing angle <span>(theta)</span>. This is because the ion-acoustic mode is strong at the propagation angle at <span>(theta = 0^{circ })</span> and weakens as the propagation angle increases, eventually disappearing at <span>(theta = 90^{circ })</span>. Thus, these findings provide an appreciable understanding of the dispersion characteristics of obliquely propagating IASS modes in a magnetized e–p–i plasma. In conclusion, our results provide important and new information on the interaction of plasma parameters in complex astronomical (natural) and laboratory (artificial) settings.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"20 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947804","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":"Effect of heat treatment on structural, optical and magneto-dielectric properties of Co–Cu spinel nano ferrites","authors":"Poorva Rani, Priyanka Godara, Ram Mehar Singh, Ashok Kumar","doi":"10.1007/s12648-024-03283-4","DOIUrl":"https://doi.org/10.1007/s12648-024-03283-4","url":null,"abstract":"<p>Here, we have investigated the impact of heat treatment on structural, morphological, optical and magneto-dielectric properties of Co_0.5Cu_0.5Fe₂O₄ spinel nanoferrites prepared by sol–gel auto-combustion method. The prepared samples were sintered at 700, 800, and 900 °C and then characterized by XRD, FTIR, SEM, UV–Vis spectroscopy, VSM and impedance analyser techniques. The obtained XRD patterns were refined with Full Prof Suite Software which confirmed the cubic spinel structure of the prepared sample and it was observed that crystallite size increases from 38 to 44 m with increase in sintering temperature and the same is confirmed by W–H plot also. The SEM micro graphs represent the morphological features of the prepared samples and average particle size was calculated by using the imageJ software, which ranges 47–126 nm with increase in temperature. The FTIR spectra confirmed the presence of tetrahedral and octahedral sites in the prepared samples. Various optical parameters were recorded using UV–Vis spectroscopy and it was found that optical band gap energy decreased from 3.976 to 3.832 eV, whereas refractive index increased from 2.262 to 2.283, and high frequency dielectric constant varied from 5.114 to 5.210 with rise in temperature which was due to decrease in grain boundary area and porosity. The magnetic studies were carried out at room temperature using VSM and it was found that magnetic parameters get improved with increase in sintering temperature. Dielectric measurements were made by impedance analyser in a frequency range of 20 Hz to 10 MHz which were in consonance with Maxwell–Wagner polarization and Koop’s theory.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"73 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141864290","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":"Structural and optical properties of Cu:CdS thin films on soft polymer substrate","authors":"Sk. Faruque Ahmed, Mohibul Khan","doi":"10.1007/s12648-024-03344-8","DOIUrl":"https://doi.org/10.1007/s12648-024-03344-8","url":null,"abstract":"<p>The structural and optical properties of copper doped cadmium sulfide (Cu:CdS) thin films on flexible polyethylene terepthalate substrates have been presented. The hexagonal crystallite structure of as-deposited thin films was characterized by the X-ray diffraction technique. X-ray photoelectron spectroscopy has been used to study the chemical binding energy and compositional analysis of the deposited thin films. The surface morphology of the deposited thin films has been analysed by an atomic force microscope image. The optical and photoluminescence properties of deposited films have been studied by UV–Vis–NIR spectrophotometer and fluorimeter respectively. A linear shrinkage of lattice parameters has been observed in the CdS thin films with Cu doping because of the smaller ionic radius of Cu than that of Cd. The optical band gap energy of CdS thin films decreased initially with Cu doping due to s, p–d exchange interactions and then increased due to the reduction in crystallite size. The photoluminescence property of the Cu:CdS thin films has been studied at room temperature (30 °C). Photoluminescence spectra showed two emission peaks around 545 nm and 580 nm, respectively, the exact positions of which are dependent on the Cu at% in the thin films. The former is due to the band-band transition of CdS, and the second is due to sulphur vacancy.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"262 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141864292","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}