The European Physical Journal Plus最新文献

Dusty plasma sheath with non-extensive electrons and an inhomogeneous magnetic field 尘埃飞扬的等离子体鞘层，有不广泛的电子和不均匀的磁场

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-05-19 DOI: 10.1140/epjp/s13360-025-06368-z

Zakariae Eljabiri, Omar El Ghani, Ismael Driouch, Hassan Chatei

{"title":"Dusty plasma sheath with non-extensive electrons and an inhomogeneous magnetic field","authors":"Zakariae Eljabiri, Omar El Ghani, Ismael Driouch, Hassan Chatei","doi":"10.1140/epjp/s13360-025-06368-z","DOIUrl":"10.1140/epjp/s13360-025-06368-z","url":null,"abstract":"<div>In this paper, we analyze the impact of the non-uniform magnetic field in the sheath of a complex plasma within the framework of a non-extensive distribution of electrons ((qne 1)). Our analysis reveals that the evolution of the magnetic field profile plays a significant role in the sheath formation by influencing the electric potential, density, and velocity of plasma species, as well as the dynamics of dust particles within the sheath. Through a careful comparison of simulation data from one-dimensional fluid models between two configurations: the inhomogeneous magnetic field and the uniform one, under various values of the q-parameter, we demonstrate the necessity of considering the inhomogeneity of the magnetic field in fluid models to accurately describe the structure of the sheath. In particular, the results show that when a non-uniform magnetic field is considered, the structure of the sheath changes significantly when (q<1). For instance, the inhomogeneous magnetic field, especially at low q values, demonstrates the ability to control and confine ions within the plasma sheath, while also reducing the presence of dust grains.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 5","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

A new neutron area monitor with extended energy range 一种扩展能量范围的新型中子面积监测仪

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-05-18 DOI: 10.1140/epjp/s13360-025-06348-3

L. Russo, R. Bedogni, M. A. Caballero-Pacheco, A. I. Castro-Campoy, F. L. Frigi, A. Pietropaolo, A. Calamida, J. M. Gomez-Ros, S. Turchi, A. Allaoua, Q. Ducasse, N. Magalotti, F. Pozzi

{"title":"A new neutron area monitor with extended energy range","authors":"L. Russo, R. Bedogni, M. A. Caballero-Pacheco, A. I. Castro-Campoy, F. L. Frigi, A. Pietropaolo, A. Calamida, J. M. Gomez-Ros, S. Turchi, A. Allaoua, Q. Ducasse, N. Magalotti, F. Pozzi","doi":"10.1140/epjp/s13360-025-06348-3","DOIUrl":"10.1140/epjp/s13360-025-06348-3","url":null,"abstract":"<div>Radiation protection monitoring in installations producing high-energy neutrons requires dedicated instrumentation, called extended range neutron area monitors (ERNAM). With the main purpose of increasing the sensitivity of this class of instrument, while keeping a good degree of isotropy, a new portable device called neutron extended counter for high energy (NECH) was prototyped. NECH is based on a Helium-3 proportional counter placed in the center of a cylindrical polyethylene moderator with truncated cone ends, embedding a lead insert to promote the detection of neutrons above 20 MeV. NECH responds nearly isotropically, in terms of ambient dose equivalent H*(10), up to GeV neutrons. Its sensitivity is about three times larger than common commercial instruments of the same class. This novel instrument was fully simulated with Monte Carlo N-Particle (MCNP) and calibrated in radionuclide-based reference neutron fields at IRSN Cadarache and ENEA Frascati. Workplace testing was performed around the ENEA Frascati Neutron Generator operating at 2.5 MeV and, for the high-energy domain, at the CERN-EU high-energy Reference Field facility (CERF). This work presents the instrument, the simulated and measured dose equivalent response and the results of the workplace testing. The performance is compared with that of commercial ERNAMs.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 5","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

An algebraic approach to gravitational quantum mechanics 引力量子力学的代数方法

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-05-18 DOI: 10.1140/epjp/s13360-025-06335-8

Won Sang Chung, Georg Junker, Hassan Hassanabadi

引用次数: 0

Optimization of heat engines with fixed heat fluxes at the hot or the cold side 热侧或冷侧固定热流通量的热机优化

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-05-16 DOI: 10.1140/epjp/s13360-025-06395-w

J. J. Fernández

引用次数: 0

Higgs decay to (Zgamma ) in the minimal supersymmetric standard model and its nonholomorphic extension 最小超对称标准模型及其非全纯扩展中的希格斯衰变到(Zgamma )

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-05-16 DOI: 10.1140/epjp/s13360-025-06401-1

S. Israr, M. Rehman

{"title":"Higgs decay to (Zgamma ) in the minimal supersymmetric standard model and its nonholomorphic extension","authors":"S. Israr, M. Rehman","doi":"10.1140/epjp/s13360-025-06401-1","DOIUrl":"10.1140/epjp/s13360-025-06401-1","url":null,"abstract":"<div>Recent measurements of ( h rightarrow Z gamma ) from CMS and ATLAS indicate an excess over standard model (SM) predictions, suggesting the presence of new physics. In this work, we investigate the ( h rightarrow Z gamma ) decay within the minimal supersymmetric standard model (MSSM) and its nonholomorphic extension, the NHSSM. Calculations are performed using the FeynArts/FormCalc setup, utilizing the pre-existing model file for MSSM and generating the NHSSM model file with the support of SARAH. For the parameter space examined in this study, MSSM contributions to ( h rightarrow Z gamma ) can significantly surpass SM predictions reaching to the value (Gamma (h rightarrow Z gamma )= 9.77 times 10^{-6} ,, textrm{GeV}), thereby bringing ( Gamma (h rightarrow Z gamma ) ) closer to the experimental value. The SM-predicted value deviates from the experimental value by (1.7 sigma ). However, the MSSM contributions can reduce this deviation to less than (1 sigma ). In contrast, NHSSM contributions remain negligible and do not produce sizable corrections to the ( h rightarrow Z gamma ) decay width.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 5","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Modeling the effects of psychological fear, media-induced awareness, and sanitation efforts on the dynamics of bacterial diseases 模拟心理恐惧、媒体诱导的意识和卫生努力对细菌疾病动态的影响

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-05-16 DOI: 10.1140/epjp/s13360-025-06337-6

Kuldeep Kumar Tripathi, Maitri Verma, Arvind Kumar Misra

{"title":"Modeling the effects of psychological fear, media-induced awareness, and sanitation efforts on the dynamics of bacterial diseases","authors":"Kuldeep Kumar Tripathi, Maitri Verma, Arvind Kumar Misra","doi":"10.1140/epjp/s13360-025-06337-6","DOIUrl":"10.1140/epjp/s13360-025-06337-6","url":null,"abstract":"<div>Bacterial diseases significantly impact human health and the economy, posing serious challenges to societal well-being. Psychological fear of infection motivates behavioral changes to reduce contacts with infected individuals. Awareness campaigns play a crucial role in educating the public about precautionary measures, thereby reducing the likelihood of bacteria ingestion from contaminated sources. Furthermore, individuals who are informed through such campaigns often implement sanitation practices that help to reduce bacterial density in the environment. This study develops a nonlinear mathematical model to analyze the effects of psychological fear, media-induced awareness, and sanitation practices on bacterial disease dynamics. The model considers infection transmission through direct contacts with infected individuals and indirect exposure to environmental bacteria, assuming bacterial density increases proportional to the infected population. Results show that psychological fear, media-driven awareness, and sanitation play crucial roles in shaping bacterial disease dynamics. A higher growth rate of media advertisements induces limit cycle oscillations in the system via Hopf-bifurcation. However, these oscillations diminish when psychological fear surpasses a threshold. Furthermore, it is found that increasing efficacy of media advertisements in promoting precautionary behaviors and enhancing the depletion rate of bacteria through sanitation efforts by aware individuals can reduce disease prevalence. However, these measures may also induce periodic oscillations by lowering the Hopf-bifurcation threshold for media advertisements growth. An increase in the depletion rate of bacteria due to sanitation efforts can also lead to stability switch via double Hopf-bifurcation, underscoring the need for balanced sanitation strategies to prevent oscillations while ensuring effective disease control.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 5","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Neutrino mass and mixing from a novel scenario with (A_4) symmetry 中微子质量和混合从一个新的场景与(A_4)对称

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-05-16 DOI: 10.1140/epjp/s13360-025-06346-5

V. V. Vien

{"title":"Neutrino mass and mixing from a novel scenario with (A_4) symmetry","authors":"V. V. Vien","doi":"10.1140/epjp/s13360-025-06346-5","DOIUrl":"10.1140/epjp/s13360-025-06346-5","url":null,"abstract":"<div>We propose a standard model (SM) extension with (A_4) symmetry giving rise to the desired neutrino mass matrix structure with the suitable correlation ((M_nu )_{22}= -2 (M_nu )_{13}) by the contributions of the Weinberg-type operators and the type-I seesaw mechanism. We find the parameters of the model that can predict the sum of neutrino masses, the effective neutrino mass, the Dirac and Majorana CP phases for both the normal ordering (NO) and the inverted ordering (IO). Our analysis reveals a narrow range for the sum of neutrino masses, approximately 131 meV for NO and 157 for IO, two mass squared differences (Delta m_{21}^2in (52.390, 99.390), mathrm{meV}^2) and (Delta m_{31}^2in (2.528, 2.570)10^3,mathrm{meV}^2) for NO, while (Delta m_{21}^2in (52.500, 99.350), mathrm{meV}^2) and (Delta m_{31}^2in (-2.475, -2.426)10^3,mathrm{meV}^2) for IO, and the Dirac phase (s_delta in (-0.289, -0.146)) for IO and (s_delta in (-0.970, -0.968)) for IO. Utilizing these constraints, we determine the effective Majorana mass, two Majorana phases and the lightest neutrino mass for both NO and IO. Finally, we estimate the magnitude of the Yukawa-like couplings which can naturally account for the charged-lepton and neutrino mass hierarchies.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 5","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Wave modes and gravitational instability in degenerate quantum plasmas including radiation pressure and viscoelastic effects 简并量子等离子体中的波模和引力不稳定性，包括辐射压力和粘弹性效应

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-05-16 DOI: 10.1140/epjp/s13360-025-06344-7

Ravinder Bhambhu, Jyoti Turi, Ram Prasad Prajapati

{"title":"Wave modes and gravitational instability in degenerate quantum plasmas including radiation pressure and viscoelastic effects","authors":"Ravinder Bhambhu, Jyoti Turi, Ram Prasad Prajapati","doi":"10.1140/epjp/s13360-025-06344-7","DOIUrl":"10.1140/epjp/s13360-025-06344-7","url":null,"abstract":"<div>The wave modes and linear Jeans instability in the ultra-relativistic degenerate strongly coupled quantum plasma have been studied using the quantum hydrodynamic fluid description considering the influence of radiation pressure, Ohmic diffusivity and uniform rotation. The modified equation of state is considered in the fluid model, which includes the effects of radiation pressure of weakly coupled, degenerate, and ultra-relativistic electrons and non-degenerate strongly coupled ions. The general dispersion relation is analytically derived using the normal mode analysis and examined in the transverse and longitudinal modes of propagation in hydrodynamic and kinetic limits. The Jeans instability criterion depends upon the characteristic wave speed of the system modified due to radiation pressure, electron degeneracy pressure, and ion gas pressure. For an infinitely conducting fluid, the Alfvén speed is observed to intervene in the instability condition and modify the critical Jeans wavenumber in transverse propagation. The graphical illustrations show that the growth rate of Jeans instability in the kinetic limit is significantly reduced due to the prominent role of radiation pressure, compressional viscoelastic effects, electron degeneracy pressure, fluid rotation, and quantum corrections. The dispersion properties of wave modes and linear instabilities are analyzed in various limiting cases of interest. The present theoretical results have been applied to understand the gravitational collapse of white dwarfs, and it is observed that perturbations of wavelength larger than the Jeans length ({lambda _{text{J}}} simeq 1.7 times {10^5};{text{km}}) make white dwarfs gravitationally unstable.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 5","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Modeling and managing chaos: a fear-affected discretized prey–predator system with Allee Effect 混沌的建模与管理：一个具有Allee效应的恐惧影响的离散捕食-捕食系统

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-05-15 DOI: 10.1140/epjp/s13360-025-06354-5

Manisha Yadav, Pradeep Malik, Md. Jasim Uddin, Nehad Ali Shah

引用次数: 0

Correction: Effects of selected physical parameters on the gamma-ray-induced EPR signal of glycine dosimeter 修正：选定物理参数对甘氨酸剂量计γ射线诱发EPR信号的影响

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-05-15 DOI: 10.1140/epjp/s13360-025-06133-2

E. Aboelezz, M. A. Sharaf

引用次数: 0