Brazilian Journal of Physics最新文献

Insights into the Deformation of Mask Openings Under Ion Tilting During Plasma Etching 等离子体蚀刻过程中离子倾斜下掩膜开口变形的研究

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-05-07 DOI: 10.1007/s13538-026-02090-y

Peng Zhang

引用次数: 0

Neutron Pickup in 13C(d,t)12C: Cross-Section Measurements and Spectroscopic Factors at Low Deuteron Energies 13C(d,t)12C中的中子拾取：低氘核能量下的截面测量和光谱因子

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-05-07 DOI: 10.1007/s13538-026-02075-x

Maulen Nassurlla, S.К. Sakhiyev, N. Burtebayev, Awad A. Ibraheem, S. B. Sakuta, Marzhan Nassurlla, R. A. Khojayev, K. A. Talpakova, D. A. Issayev, A. Nurpeisov, S. A. Turganova, Sh. Hamada

{"title":"Neutron Pickup in 13C(d,t)12C: Cross-Section Measurements and Spectroscopic Factors at Low Deuteron Energies","authors":"Maulen Nassurlla, S.К. Sakhiyev, N. Burtebayev, Awad A. Ibraheem, S. B. Sakuta, Marzhan Nassurlla, R. A. Khojayev, K. A. Talpakova, D. A. Issayev, A. Nurpeisov, S. A. Turganova, Sh. Hamada","doi":"10.1007/s13538-026-02075-x","DOIUrl":"10.1007/s13538-026-02075-x","url":null,"abstract":"<div>We investigated the neutron pickup reaction 13C(d,t)12C at deuteron beam energies of 14.5 and 18 MeV, populating states in 12C at 0.0 MeV (0+), 4.43 MeV (2+), 7.65 MeV (({0}_{2}^{+})), and 9.64 MeV(3−). The measured angular distributions (ADs) were analyzed using both the Distorted Wave Born Approximation (DWBA) and Coupled Reaction Channels (CRC) frameworks, assuming a direct one-step neutron transfer process. Spectroscopic amplitudes (SAs) for the 13C → 12C(12C*) + n configurations were extracted and show reasonable agreement with theoretical predictions where available. The DWBA analysis provided a better overall description of the experimental data compared to CRC, particularly for the ground state and lower excitations. Although CRC incorporated channel-coupling effects, the improvements were marginal, with persisting discrepancies at backward angles. A notable energy dependence was observed for the SA of the 3− state. To our knowledge, this work reports the first experimental determinations of SAs for the 7.65 MeV (({0}_{2}^{+})) and 9.64 MeV (3−) states in 12C from the 13C(d,t) reaction, although the SA for the 9.64 MeV state shows significant model and energy dependence. These results offer new insights into nuclear structure and neutron configurations in light nuclei.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829740","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

On the Relative CNO Underabundance in Quasar Absorption Systems at (z sim 3) Arising From Population III Enrichment and Attenuation by Intermediate-mass Black Holes and Primordial Baryon Accretion 中质量黑洞和原始重子吸积对类星体吸收系统III族的富集和衰减引起的(z sim 3)类星体吸收系统中CNO的相对欠丰度

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-05-06 DOI: 10.1007/s13538-026-02081-z

Murilo Macedo, Carlos Alexandre Wuensche, Oswaldo Duarte Miranda

{"title":"On the Relative CNO Underabundance in Quasar Absorption Systems at (z sim 3) Arising From Population III Enrichment and Attenuation by Intermediate-mass Black Holes and Primordial Baryon Accretion","authors":"Murilo Macedo, Carlos Alexandre Wuensche, Oswaldo Duarte Miranda","doi":"10.1007/s13538-026-02081-z","DOIUrl":"10.1007/s13538-026-02081-z","url":null,"abstract":"<div>This article uses an adapted version of the semi-analytical model of cosmic chemical enrichment developed by [1] to reproduce the observed abundances of C, N, and O in absorption systems of quasar spectra (ASQS) at (z gtrsim 3-6), addressing an overproduction issue of the abovementioned elements. We address this discrepancy by updating the cosmic star formation rate (CSFR) and introducing intermediate-mass black holes (IMBHs) as permanent matter sinks without accounting for a dynamic cosmic mass accretion rate. Our results indicate that IMBHs act as essential metallicity attenuators through mass sequestration, providing the physical regulation necessary to reconcile theoretical yields with observed data. We show that the interplay between Pop III yields, the cosmic baryon accretion rate (CBAR) from primordial nucleosynthesis, and mass sequestration by IMBHs mitigates the CNO excess. This work reinforces the role of black hole-driven processes in the chemical evolution of the Universe and identifies IMBH accretion rates as a primary area for future refinement.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13538-026-02081-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829169","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

Simulation of Comet-Solar Wind Interaction in the AMROC Framework with the IGLM-MHD Scheme 用IGLM-MHD方案模拟AMROC框架下彗星-太阳风相互作用

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-05-02 DOI: 10.1007/s13538-026-02079-7

Edgard F. D. Evangelista, Odim Mendes, Margarete O. Domingues, Leonardo Cassará, Oswaldo Duarte Miranda, Varlei Everton Menconi, Ralf Deiterding

{"title":"Simulation of Comet-Solar Wind Interaction in the AMROC Framework with the IGLM-MHD Scheme","authors":"Edgard F. D. Evangelista, Odim Mendes, Margarete O. Domingues, Leonardo Cassará, Oswaldo Duarte Miranda, Varlei Everton Menconi, Ralf Deiterding","doi":"10.1007/s13538-026-02079-7","DOIUrl":"10.1007/s13538-026-02079-7","url":null,"abstract":"<div>In this work we present 2-dimensional, 1-fluid magnetohydrodynamic (MHD) simulations of the interaction of a comet with the solar wind. Even though our model can in principle run simulations with time-dependent physical parameters representing the comet travelling along its elliptic orbit, here we focus on “snapshots” at four heliocentric distances, namely: 1.3, 2.0, 2.7 and 3.25 AU. This strategy allows us to analyse some key features of the comet at relatively low computational cost. Our aim here is to present our implementation of such a scenario with the AMROC computational code and study the main features of the comet, which has the physical characteristics of 67P/Churyumov-Gerasimenko (67P/CG). The dependence of the physical parameters on the heliocentric distance is given by means of Parker’s model and of functions obtained from curve fitting of data collected in the literature. In addition, we model comets with three forms: circular, elliptic and bilobed (or “peanut-shaped”.) AMROC is in development and the model shown here is an valuable contribution to these efforts, as it represents a new kind of problem implemented in this code. Furthermore, our model provides the possibility of creation of new and interesting scenarios with regard to comets and other sources of plasma.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829681","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

Noise-Induced Modulation of Polaron Stability and Bandgap in Monolayer Transition Metal Dichalcogenides 单层过渡金属二硫族化合物极化子稳定性和带隙的噪声诱导调制

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-05-01 DOI: 10.1007/s13538-026-02084-w

G. M. Moussavou, M. R. Kamsap, M. D. Mboumba, A. G. M. Mahoundi, J. V. Nguepnang, C. M. Ekengoue, C. Kenfack-Sadem, A. B. Moubissi

{"title":"Noise-Induced Modulation of Polaron Stability and Bandgap in Monolayer Transition Metal Dichalcogenides","authors":"G. M. Moussavou, M. R. Kamsap, M. D. Mboumba, A. G. M. Mahoundi, J. V. Nguepnang, C. M. Ekengoue, C. Kenfack-Sadem, A. B. Moubissi","doi":"10.1007/s13538-026-02084-w","DOIUrl":"10.1007/s13538-026-02084-w","url":null,"abstract":"<div>This paper aims to investigate the effect of a noisy electric field on dynamic parameters of polaron in two-dimensional (2D) transition metal dichalcogenides (TMDs). We employ a theoretical framework based on the variational Lee-Low-Pines (LLP) method combined with a stochastic analysis of the noisy electric field. The dynamics are modeled by considering both longitudinal optical (LO) phonon of the crystal and surface optical (SO) induced by the polar substrates phonon interacting with electron and hole. The study reveals that noise significantly modifies the properties of the polaron: it increases their energies, reduces their lifetime and influences their mobility. The results also demonstrate that the studied 2D TMDs exhibit instantaneous negative values of the bandgap. However, this gap fluctuation, or transient closure, constitutes a dynamic instability induced by the correlated Ornstein–Uhlenbeck (OU) noise, rather than a structural or electronic phase transition in the thermodynamic sense of the term. We observe a highest mobility of polaronic entities in WS2. The present study provides deep insight into the role of the environment of the dielectric on dynamics parameters of 2D materials, highlighting the influence of noisy electric field on their physical properties.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147757195","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

Dissipative Adaptation in a Driven Spin-Boson Model Within the Path-Integral Formalism 路径积分形式下驱动自旋玻色子模型的耗散适应

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-05-01 DOI: 10.1007/s13538-026-02086-8

Elisa I. Goettems, Ricardo J. S. Afonso, Diogo O. Soares-Pinto, Daniel Valente

引用次数: 0

Steady-State Entanglement and Steering in a Hybrid Exciton-Optomechanical System 激子-光-力混合系统的稳态纠缠和转向

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-04-30 DOI: 10.1007/s13538-026-02076-w

M. A. EL-Sayed, M. Y. Abd-Rabbou, S. Esmail

引用次数: 0

Quantum Key Distribution with Imperfections: Recent Advances in Security Proofs 具有缺陷的量子密钥分发：安全证明的最新进展

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-04-30 DOI: 10.1007/s13538-026-02062-2

Patrick Andriolo, Esteban Vasquez, Elizabeth Agudelo, Max Riegler, Matej Pivoluska, Gláucia Murta

{"title":"Quantum Key Distribution with Imperfections: Recent Advances in Security Proofs","authors":"Patrick Andriolo, Esteban Vasquez, Elizabeth Agudelo, Max Riegler, Matej Pivoluska, Gláucia Murta","doi":"10.1007/s13538-026-02062-2","DOIUrl":"10.1007/s13538-026-02062-2","url":null,"abstract":"<div>In contrast to classical public-key cryptosystems, where the security of encoded messages relies on computational assumptions, Quantum Key Distribution (QKD) enables two distant parties to establish a shared secret key that, when combined with a one-time pad, provides information-theoretically secure encryption, provided that the QKD protocol is supported by a rigorous security proof. In the last decades, security proofs robust against a wide range of eavesdropping strategies have established the theoretical soundness of several QKD protocols. However, most proofs are based on idealized models of the physical systems involved in such protocols and often include assumptions that are not satisfied in practical implementations. This mismatch creates a gap between theoretical security guarantees and actual experimental realizations, making QKD protocols vulnerable to attacks. To ensure the security of real-world QKD systems, it is therefore essential to account for imperfections in security analyses. In this article, we present an overview of recent analytical and numerical developments in QKD security proofs, which provide a versatile approach for incorporating imperfections and re-establishing the security of quantum communication protocols under realistic conditions.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13538-026-02062-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147757182","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

Enhancing Titanium Thin Film Properties Through Controlled Sputtering Power: A Multifractal Analysis 通过控制溅射功率提高钛薄膜性能：多重分形分析

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-04-30 DOI: 10.1007/s13538-026-02078-8

Bandar Astinchap, Suhilla Sami, Erfan Norian, Sayed Mohaiuddin Awrang, Hamta Ghanbaripour, Mona Abdi

引用次数: 0

Systematic Microscopic Analysis of ³²S + ⁴⁰Ca Scattering: Role of Pauli Correlations and Dispersion Relations ³²S +⁴⁰Ca散射的系统微观分析：泡利相关和色散关系的作用

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-04-27 DOI: 10.1007/s13538-026-02073-z

A. Hemmdan, M. A. Hassanain

{"title":"Systematic Microscopic Analysis of ³²S + ⁴⁰Ca Scattering: Role of Pauli Correlations and Dispersion Relations","authors":"A. Hemmdan, M. A. Hassanain","doi":"10.1007/s13538-026-02073-z","DOIUrl":"10.1007/s13538-026-02073-z","url":null,"abstract":"<div>\u0000 \u0000 The elastic scattering of ³²S + ⁴⁰Ca has been analyzed at laboratory energies from 90 to 151 MeV using the double-folding model with five different M3Y-Reid-based effective interactions: the density-independent M3Y-ZR, the density-dependent zero range DDM3Y-ZR, the density- dependent finite range (DDM3Y-FR and CDM3Y6-FR), and the explicit Pauli-correlated M3Y-P interaction. The resulted angular distribution cross sections successfully reproduced the experimental data over the full energy range. The extracted optical model parameters show that the real volume integrals exhibits weak energy dependence, while the imaginary volume integral and reaction cross section increase smoothly with energy. The calculations of the dispersion-relation show a moderate dispersive contribution to the real volume integral, consistent with a weak threshold anomaly behavior. The results constitute clear microscopic evidence that Pauli blocking in the knock-on exchange term is a key mechanism stabilizing the real potential in heavy-ion scattering with subdued dynamic polarization effects.\u0000 </div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147796891","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