Charge-parity (CP) violation in the tau-charm energy region is a promising area for sensitive tests of Standard Model (SM) predictions and searches for new, beyond the SM physics. A future Tau-Charm Facility that operates at center-of-mass energies between 2.0 and 7.0 GeV, with a peak luminosity of 0.5×1035 cm−2 s−1, would provide huge numbers of hadrons and tau (τ) leptons that are produced in low-background environments and with well understood kinematic properties. In this report, prospects for unique studies of CP violation in the decay of charmed hadrons, and in the production and decay of hyperons and τ leptons at a next-generation tau-charm facility are discussed. In addition, opportunities for improved tests of CPT invariance test in K0−K̄0 mixing are presented.
Tri-structural isotropic nuclear fuel (TRISO), commonly used in high-temperature reactors is known for its exceptional durability. However, during neutron irradiation in the reactor core, under both normal and accidental conditions, damage can occur to the TRISO particle’s coating layers. In the context of fuel quality classification, TRISO particles should be examined both before and after fuel irradiation. To examine the inner layers of the spherical TRISO fuel, particles should be polished in order to reveal their mid-plane. Polished samples can then be thoroughly analysed using various tools. Although the polishing procedure for TRISO particles is relatively straightforward, using unsuitable materials can mechanically damage the surface of the coating layers. This study offers a detailed step-by-step guide for polishing TRISO particles in both cold and hot laboratories.
Medium-entropy alloys (MEAs) are emerging materials known for their remarkable mechanical properties. This study employs molecular dynamics simulations to investigate the deformation mechanisms of face centered cubic structure NiCoFe MEAs with a typical < 111 > orientation. The mechanical response is evaluated under various indentation velocities to understand the influence of the deformation rate on the mechanical behavior. The results show that the strain rate significantly influences deformation behavior. In single crystals, lower strain rates promote extensive Shockley partial dislocation and prismatic dislocation loop formation, while higher strain rates limit dislocation nucleation due to reduced relaxation time. In polycrystalline samples, grain boundaries (GBs) impede dislocation glide, leading to heterogeneous plastic deformation and increased residual stress at higher velocities. Smaller GBs enhance strain localization, resembling a Hall-Petch-like effect. These behaviors are governed by thermally activated dislocation interactions that are sensitive to indentation velocity, highlighting the critical role of strain rate in controlling the plastic response of NiCoFe MEAs. These findings advance our understanding of plastic deformation in MEAs and provide insights for designing alloys with improved strength and rate-sensitive performance.
We present GATE version 10, a major evolution of the open-source Monte Carlo simulation application for medical physics, built on Geant4. This release marks a transformative evolution, featuring a modern Python-based user interface, enhanced multithreading and multiprocessing capabilities, the ability to be embedded as a library within other software, and a streamlined framework for collaborative development. In this Part 1 paper, we outline GATE's position among other Monte Carlo codes, the core principles driving this evolution, and the robust development cycle employed. We also detail the new features and improvements. Part 2 will focus on the architectural innovations and technical challenges. By combining an open, collaborative framework with cutting-edge features, such a Monte Carlo platform supports a wide range of academic and industrial research, solidifying its role as a critical tool for innovation in medical physics.
We investigate the perturbative structure of the proper time renormalization group flow in scalar and Yang-Mills theories. Although the proper time flow does not belong to the class of exact functional renormalization group equations, we show that it correctly reproduces the universal coefficients of the /3 functions at one and two loops. For the O(N) scalar theory, we derive the one- and two-loop contributions to the running quartic coupling and also confirm the expected anomalous dimension. For the SU(N) YangMills theory, using the background field method, we compute the gauge coupling renormalization recovering the correct two-loop /3 function without generating any gauge-symmetry-violating terms. These results highlight that, despite its limitations for reconstructing the full effective action, the proper time flow retains the essential universal content of renormalization, accounting for its reliability in diverse applications ranging from statistical models to quantum gravity.
