Article
Physics, Particles & Fields
Carlos Silva
Summary: This paper explores the nature of spacetime in quantum gravity based on a new version of the holographic principle that establishes a connection between string theory and polymer holonomy structures. The research findings suggest that, for this relationship to hold, spacetime must be perceived as emerging from a fundamental structure with degrees of freedom corresponding to quantum correlations only.
Article
Instruments & Instrumentation
Bharti Rohila, S. R. Abhilash, Diwanshu, Chetan Sharma, Devinder Mehta, Ashok Kumar
Summary: Self-supporting and Au backed Ag-107 targets have been fabricated using a combination of cold rolling and e-beam melting technique. The method is efficient, resulting in targets without significant material loss or major contamination. Various techniques have been used for thickness measurements and characterizations, and one of the fabricated targets has been successfully used in a nuclear physics experiment.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Physics, Particles & Fields
Bogdan Damski
Summary: In this paper, we discuss the dynamics of field configurations in the Proca theory of the real massive vector field, specifically focusing on a certain class of electric (magnetic) dipole-charged states. We construct these states to ensure that the long-distance structure of the mean electromagnetic field is initially set by the formula describing the electromagnetic field of the electric (magnetic) dipole. We analyze the evolution of this mean electromagnetic field over time and observe the phenomena of harmonic oscillations of the electric (magnetic) dipole moment far from the center of the initial field configuration, as well as the emergence of a spherical shock wave propagating at the speed of light near the center. Additionally, we discover a unique axisymmetric mean electric field configuration accompanying the mean magnetic field in magnetic dipole-charged states.
Review
Astronomy & Astrophysics
Federico Cattorini, Bruno Giacomazzo
Summary: This article presents recent numerical advances in the theoretical characterization of massive binary black hole (MBBH) mergers in astrophysical environments. These systems are significant sources of gravitational waves (GWs) and promising candidates for multimessenger astronomy. Coincident detection of GWs and electromagnetic (EM) signals from merging MBBHs is a leading area of study in contemporary astrophysics. The scarcity of strong predictions for EM signals before, during, and after merger poses a major challenge in observational efforts. To address this, significant theoretical work has focused on characterizing EM counterparts that accompany GW signals. Full general relativistic modeling using Einstein's field equations coupled with magnetohydrodynamics equations has been key in producing accurate EM predictions. This review explores numerical investigations into the astrophysical manifestations of MBBH mergers and their potentially observable EM signatures.
ASTROPARTICLE PHYSICS
(2024)
Article
Instruments & Instrumentation
Jinhua Li, Zhaoyi Qu, Weiwei Xu
Summary: The AMS detector has developed a new vertex reconstruction algorithm for studying the polarization of gamma-rays, which significantly improves the efficiency of vertex reconstruction and reduces the fake rate.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Astronomy & Astrophysics
Michael Maziashvili, Vakhtang Tsintsabadze
Summary: Coupled models of quintessence are introduced to avoid or mitigate the parameter fine-tuning problem and also should avoid the fine-tuning problem related to the initial conditions. Coupled models can explain the timescale of the coincidence between dark energy and matter energy densities, as well as the transition of dark energy dominance. Studying the mass varying neutrino model of dark energy with inverse power-law potential helps to understand its naturalness.
ASTROPARTICLE PHYSICS
(2024)
Article
Instruments & Instrumentation
M. G. Mazarakis, E. Jongewaard, J. Ellsworth
Summary: This report presents experimental data and a step-by-step technique for evaluating the work functions of thermionic cathodes. The experiments were conducted using small-sized thermionic cathodes provided by Spectra-Mat corporation. The cathode electron current emission work function is emphasized as a crucial parameter for selecting cathodes in various applications.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
M. Loyd, A. Khaplanov, V. Sedov, J. Beal, T. Visscher, C. Donahue, C. Montcalm, G. Warren, R. Butz, C. Boone, C. Hart, R. Riedel, Y. Diawara
Summary: Thermal and cold neutron beamlines require detector systems with high efficiency, large active area, and good spatial resolution. This study presents a new design of Anger camera using silicon photomultipliers (SiPMs) instead of photomultiplier tubes (PMTs), offering better resolution, less distortion, and more compactness. The use of SiPMs also enables the camera to be used in strong magnetic fields, providing additional experimental capabilities.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
Hamza Ezzaoui Rahali, Mohammad Mehdi Rahimifar, Charles-Etienne Granger, Zhehui Wang, Audrey C. Therrien
Summary: This study proposes a compression scheme for X-ray image using machine learning and sparse coding to address the challenge of large data throughputs in imaging systems. The proposed scheme achieves a high compression ratio and image quality, and demonstrates low power and low latency edge data compression on FPGA.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
Rafaella Eleni Kotitsa
Summary: The FASER experiment at the LHC aims to search for new, long-lived fundamental particles. The development of a W-Si preshower detector based on a new monolithic silicon pixel sensor is expected to enhance the experiment's discovery potential. Initial tests of the sensor's components have shown positive results.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Physics, Particles & Fields
A. Senol, H. Denizli, C. Helveci
Summary: This study investigates new physics using a Monte Carlo method, and the results show stronger limitations on anomalous quartic gauge couplings compared to previous experiments.
Article
Instruments & Instrumentation
Lingyun Gong, Zhijun Wang, Weiping Dou, Weilong Chen, Chi Feng, Yue Tao, Chenxing Li, Yuan He, Shuhui Liu, Zhouli Zhang, Jianqiang Wu, Huan Jia, Yu Du, Yimeng Chu
Summary: This study developed a radio frequency quadrupole (RFQ) accelerator capable of accelerating particles with a mass-to-charge ratio up to 3. Through careful design and simulation analysis, the RFQ achieved strong transverse focusing strength and high-quality beam output at a high frequency. Experimental results from beam commissioning showed good agreement with the simulations.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Instruments & Instrumentation
Jin-wei Wang, Jun-nan Liu, Li-min Jin, Song Xue, Wan-qian Zhu, Jia-hua Chen
Summary: The performance of a gas attenuator with argon as the working medium was simulated and investigated using numerical simulation. The study obtained the temperature and density distribution of the gas inside the attenuator, demonstrating the density depression effect and attenuation results. The study provides valuable reference for performance prediction and optimization design of gas attenuators.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
Mohammad S. Sabra
Summary: In this study, the predictions of SAPTON, Geant4 models QGSP-INCLXX, and SHIELDING for the 16O + Al reaction have been validated with experimental data. It was found that SAPTON shows better agreement with the data compared to Geant4 models.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
X. He
Summary: Excellent particle identification is crucial for future Electron Ion Collider experiments. A compact modular ring imaging Cherenkov (mRICH) detector has been developed using ring imaging Cherenkov and ultra-fast time-of-flight techniques, providing K /pi separation over a wide momentum range. The detector's performance was validated through the third beam-test.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
Huynh Dinh Chuong, Nguyen Huynh Duy Khang, Le Thi Ngoc Trang, Nguyen Thi Truc Linh, Truong Thanh Sang, Nguyen Thanh Dat, Hoang Duc Tam
Summary: This paper presents a comparative study of three models, including virtual point detector (VPD), curve fitting (CF), and machine learning (ML), in determining the full-energy peak efficiency (FEPE) of HPGe detector. The study found that the ML model outperforms VPD and CF models in terms of accuracy.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
