Brazilian Journal of Physics最新文献

Canonical Form of Born-Infeld Inspired Gravity Coupled to Scalar Fields Born-Infeld启发引力耦合到标量场的标准形式

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-08-28 DOI: 10.1007/s13538-026-02142-3

J. Klusoň

引用次数: 0

Accretion onto a Bardeen Black Hole 巴丁黑洞的吸积

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-08-26 DOI: 10.1007/s13538-026-02144-1

Laiba Mughal, Abdul Rehman Kashif, Waqar Ahmad

引用次数: 0

Coherent Manipulation of Optical Force Birefringence in Chiral Atomic Medium 手性原子介质中光力双折射的相干操纵

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-08-22 DOI: 10.1007/s13538-026-02047-1

Iqbal Hussain, Asghar Ali, Bakht Amin Bacha, Ali Akgül

{"title":"Coherent Manipulation of Optical Force Birefringence in Chiral Atomic Medium","authors":"Iqbal Hussain, Asghar Ali, Bakht Amin Bacha, Ali Akgül","doi":"10.1007/s13538-026-02047-1","DOIUrl":"10.1007/s13538-026-02047-1","url":null,"abstract":"<div>The birefringence of optical forces are controlled and manipulated by application of laser driving fields in the four level chiral atomic medium. Optical forces in the form of left and right circularly polarized (LCP/RCP) vectors field arrows and its reported magnitudes is significantly controlled and investigated with spatial, detuning and Rabi frequency coordinates. Optical force magnitude and vectorial form result through the use of azimuthally polarized Laguerre Gaussian (LG) vortex lasers beam and their dependence on orbital angular momentum. Optical force magnitude depends on the probe and control laser fields detuning and Rabi frequencies and phases. The optical forces LCP and RCP vector fields are also fluctuating functions of various orbital, magnetic and spin quantum numbers of controlled laser driving fields in chiral atomic medium. The minimum magnitude of optical force measured is 0.05 Pico Newton and maximum optical force magnitude is to be 4.0 Pico Newton both for LCP and RCP beams in chiral atomic medium. The modified results of this manuscript is useful for nano science and optical tweezers technology.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148836303","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}

引用次数: 0

Theory of High-Tc Superconductivity in Cuprates 铜酸盐的高温超导理论

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-08-21 DOI: 10.1007/s13538-026-02134-3

E. C. Marino

{"title":"Theory of High-Tc Superconductivity in Cuprates","authors":"E. C. Marino","doi":"10.1007/s13538-026-02134-3","DOIUrl":"10.1007/s13538-026-02134-3","url":null,"abstract":"<div>The essential physical processes underlying the phenomenon of high-Tc superconductivity in cuprates occur in the (CuO_2) planes, found in these materials. The dynamics of the active electrons belonging to such planes is well described by the Three Bands Hubbard Model (3BHM). The complexity of such model, however, led the researchers to look for simpler and yet relevant alternatives. In the attempts to circumvent the complexity of this model, two main simplified versions of the (3BHM) were considered. In the first alternative, one eliminates the doped holes and their respective sub-lattices by tying them to the (Cu^{++}) electrons, thereby forming the so-called Zhang-Rice singlets. The remaining dynamics consists in doping a Mott-Hubbard insulator and is described by the t-J Model. The second alternative maintains that the (Cu^{++}) electrons form a square lattice of localized spins, while the doped holes move along the oxygen sub-lattices and undergo a Kondo-like magnetic interaction with the localized spins, besides the Hubbard-like electric repulsion. This scenario is described by the Spin-Fermion-Hubbard Model. Most of the researchers in the field chose to follow the first road, while I chose the second one. In this article, I review in detail the reasons why that choice has led to a successful theory for high-Tc superconductivity in hole-doped cuprates.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13538-026-02134-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical Investigation of Fragmentation Potential by Incorporating Proximity and Skyrme Potentials 结合邻近势和天际线势的破碎势理论研究

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-08-17 DOI: 10.1007/s13538-026-02140-5

Chahat Jindal, Manoj K. Sharma

{"title":"Theoretical Investigation of Fragmentation Potential by Incorporating Proximity and Skyrme Potentials","authors":"Chahat Jindal, Manoj K. Sharma","doi":"10.1007/s13538-026-02140-5","DOIUrl":"10.1007/s13538-026-02140-5","url":null,"abstract":"<div>The ground state decay analysis is carried out for the radioactive (^{252})Cf nucleus, as it can decay through multiple disintegration pathways. An attempt is made to understand the same in the present work by employing a theoretical approach based on quantum mechanical fragmentation theory (QMFT). The binary decay is analyzed using the preformed cluster model (PCM), employing two different nuclear interaction potentials: the proximity potential and the Skyrme energy density formalism (SEDF). Our study reveals that the potential based on SEDF (SKT3 force) demonstrates a reasonable agreement with experimental half-lives. Furthermore, the SKT3 force is employed to investigate the ternary fission of the (^{252})Cf nucleus. For both cases (binary and ternary) the mass distribution of spherical configuration leads to nearly symmetric fragments, whereas the fragments with higher mass asymmetry start operating for the cold-elongated configuration. In addition to this, the relative yield for ternary fission of the (^{252})Cf nucleus is calculated and compared with experimental data.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782082","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}

引用次数: 0

Possible Multiple Antimagnetic Rotational Bands in (^{102})Ru (^{102}) Ru中可能存在的多个反磁旋转带

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-08-12 DOI: 10.1007/s13538-026-02139-y

Pooja Chauhan, Dalip Singh Verma, S. Sihotra

{"title":"Possible Multiple Antimagnetic Rotational Bands in (^{102})Ru","authors":"Pooja Chauhan, Dalip Singh Verma, S. Sihotra","doi":"10.1007/s13538-026-02139-y","DOIUrl":"10.1007/s13538-026-02139-y","url":null,"abstract":"<div>The observation of multiple antimagnetic rotational (AMR) bands of different parity in a nucleus provides valuable insight into the underlying shears mechanism in weakly deformed or nearly spherical nuclei. Antimagnetic rotation is generally characterized by a varying dynamic moment of inertia (Im ^{(2)}), a decreasing trend of reduced quadrupole transition probabilities B(E2), with increasing spin, and a corresponding increase in the ratio (Im ^{(2)})/B(E2). Here, the semiclassical particle-rotor model is employed to investigate the rotational bands of (^{102})Ru nucleus, and AMR is obtained in the spin ranging from 15(hbar ) - 23(hbar ) for the negative parity Band-2 with configuration (pi (g_{9/2})^{-2}) (otimes ) (nu ((h_{11/2}) ~(g_{7/2})^{3})), including a core contribution of 2(hbar ). The calculated B(E2) values for (^{102})Ru show a decreasing trend with spin and follow the systematics of the neighbouring nuclei (^{104})Pd, (^{105})Pd, (^{106})Cd, and (^{107})Cd, a support for AMR character in negative parity band. The present results, when considered together with the previously reported AMR in the positive-parity Band-1, theoretically establish the possibility of the presence of antimagnetic rotations in both positive and negative-parity bands, i.e., multiple AMR in (^{102})Ru. This extends the systematics of antimagnetic rotation in the A(approx )100 mass region and provides a theoretical basis for future lifetime measurements in (^{102})Ru.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751987","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}

引用次数: 0

Correction: Over Forty Years of Research Towards the Understanding of Quantum Brownian Motion – The Contributions of A. O. Caldeira 修正：四十多年来对量子布朗运动的研究——a.o.卡尔代拉的贡献

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-08-12 DOI: 10.1007/s13538-026-02141-4

Marcus V. S. Bonança, Sebastian Deffner, Gert-Ludwig Ingold

引用次数: 0

Thermoforesis from Generalized Caldeira-Leggett Models 广义Caldeira-Leggett模型的热预测

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-08-10 DOI: 10.1007/s13538-026-02131-6

Daniel Valente, Maurício Matos, Thiago Werlang

引用次数: 0

THz Generation by a Self-Focused Gaussian Laser Beam in a QMCNTs-Based Plasma 基于qmcnt的等离子体中自聚焦高斯激光束产生太赫兹

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-08-07 DOI: 10.1007/s13538-026-02138-z

Atal Bharati, Sandeep Kumar, Vishal Thakur

{"title":"THz Generation by a Self-Focused Gaussian Laser Beam in a QMCNTs-Based Plasma","authors":"Atal Bharati, Sandeep Kumar, Vishal Thakur","doi":"10.1007/s13538-026-02138-z","DOIUrl":"10.1007/s13538-026-02138-z","url":null,"abstract":"<div>The generation of terahertz (THz) radiation through the self-focusing of a Gaussian laser beam in an array of vertically aligned quasi-metallic carbon nanotubes (VA-QMCNTs) embedded on a non-conductive glass substrate is investigated. Since ω / ωp > 1, the Gaussian laser beam propagates through the plasma. During propagation, the laser field modifies the plasma refractive index, and the resulting intensity-dependent change in refractive index leads to self-focusing of the beam. As the Gaussian beam traverses the plasma, its transverse intensity gradient exerts a nonlinear ponderomotive force on the electrons within the VA-QMCNTs. This interaction modifies the electron density and induces nonlinear currents, which serve as the source of THz radiation. The output THz power is substantially enhanced in regions where self-focusing is more pronounced. Furthermore, resonant enhancement of THz generation is observed at specific laser parameters, such as normalised pulse duration, beam width parameter, and spot size. The role of electron collision frequency in shaping the THz output is also examined. Numerical analysis reveals that the proposed scheme offers a promising pathway for THz generation. Given the strong sensitivity of THz radiations to tissue water content, the proposed scheme is relevant to non-invasive imaging of superficial tissues, including burn-depth and hydration assessment.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751423","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}

引用次数: 0

Design of a Target System for an e-Linac-Based 6 MeV SS-ADS Neutron Source 基于e- linac的6 MeV SS-ADS中子源靶系统设计

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-08-07 DOI: 10.1007/s13538-026-02137-0

Syarip Syarip, Isdandy Rezki Febrianto, Taxwim Taxwim, Taufik Taufik, Saefurrochman Saefurrochman, Wijono Wijono, Aniti Payudan

{"title":"Design of a Target System for an e-Linac-Based 6 MeV SS-ADS Neutron Source","authors":"Syarip Syarip, Isdandy Rezki Febrianto, Taxwim Taxwim, Taufik Taufik, Saefurrochman Saefurrochman, Wijono Wijono, Aniti Payudan","doi":"10.1007/s13538-026-02137-0","DOIUrl":"10.1007/s13538-026-02137-0","url":null,"abstract":"<div>This research aims to identify the optimal target design for generating neutrons using a 6 MeV electron linear accelerator (e-Linac) within the Small Scale - Accelerator Driven System (SS-ADS) experimental facility of 99Mo isotope production. The methodology employs particle transport simulations using the Particle and Heavy Ion code Transport System (PHITS), combined with Response Surface Methodology (RSM) for statistical optimization. With a beam radius of 0.1 cm, the optimal target system for the 6 MeV e-Linac incorporates an iridium pitcher and a beryllium catcher (Ir-Be) configuration. The optimal radius and thickness dimensions of the pitcher are 0.1 cm and 0.21 cm respectively, while the catcher should have a radius and thickness of 1 cm each. This Ir-Be target system configuration design can produce a total neutron flux of 3.85 106 n/cm².s.µA. Since the external neutron source requirement for experimental SS-ADS is on the order of 108 n/cm2.s, the design plan of 6 MeV e-Linac should have an electron current of 0.1 mA.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750992","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}

引用次数: 0