Article
Physics, Particles & Fields
M. Beccaria, S. Giombi, A. A. Tseytlin
Summary: This article investigates the superconformal index Z of the 6d (2,0) theory on S5 x S1 and describes it using the quantum M2 brane theory in the large N limit. By studying M2 branes in a twisted product of thermal AdS7 and S4, the leading non-perturbative term at large N is shown to be reproduced by the 1-loop partition function of an instanton M2 brane wrapped on S1 x S2 with S2 c S4. Similarly, the partition function of a defect M2 brane wrapped on thermal AdS3 c AdS7 reproduces the BPS Wilson loop expectation value in the (2,0) theory. The article also comments on the analogy of these results with similar computations in the quantum M2 brane partition function in AdS4 x S7/DOUBLE-STRUCK CAPITAL Zk, which reproduced the corresponding localization expressions in the ABJM 3d gauge theory.
Article
Instruments & Instrumentation
S. A. Wotton
Summary: The hadron particle identification provided by LHCb's RICH system is crucial for the success of the experiment, and it will continue to play a significant role in Upgrade II. To maintain the current excellent particle identification performance, substantial improvements in the precision of measuring the space and time coordinates of detected photons in the RICH and in the resolution of the reconstructed Cherenkov angle are required.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
Giacomo Volpe
Summary: The ALICE collaboration is proposing a new apparatus, ALICE 3, to investigate the Quark Gluon Plasma (QGP) properties. In this context, conceptual studies for the development of a RICH detector for ALICE 3 are ongoing. The proposed baseline layout is a proximity-focusing RICH, using aerogel as Cherenkov radiator and Silicon Photomultipliers for photon detection. The detector specifications and performance obtained by Monte Carlo simulation are presented, along with the R&D challenges related to the design.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
V. V. Haurylavets, V. K. Ivanov, A. V. Korol, A. V. Solov'yov
Summary: Computational modeling of high-energy electron passage through crystalline media is conducted using relativistic molecular dynamics. The results show good agreement with experimental data, demonstrating the accuracy of the simulations. Minor discrepancies between theory and experiment are discussed.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
Zhanguo Zong, Norihito Ohuchi, Masanori Kawai, Kazuyuki Aoki, Toshiyuki Oki, Xudong Wang, Yasushi Arimoto, Yoshinari Kondou, Kanae Aoki, Shu Nakamura, Hiroshi Yamaoka
Summary: This paper presents the designs of the cryostats and cryogenic systems for cooling SC magnets in the SuperKEKB accelerator. The cryostats are equipped with independent cryogenic systems using a 250 W refrigerator to supply subcooled LHe and maintain stable cryogenic conditions. The cryogenic systems are designed to provide a subcooled LHe flow of -20 g/s and to handle refrigeration and liquefaction loads. The paper also discusses the operation modes, cooldown and quench of the SC magnets, and evaluates the heat leaks.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
K. Ogren, D. Henzlova, J. Longo, C. Rael
Summary: The INCC software is crucial in nuclear safeguards and nuclear material control and accounting measurements. The upgraded version, INCC6, offers new capabilities and advanced analysis tools. This paper presents the first demonstration of data acquisition and analysis using INCC6 and ALMM, along with validation against INCC5 and traditional hardware.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
Mattia Soldani, Fahad Alharthi, Laura Bandiera, Nicola Canale, Gianluca Cavoto, Iryna Chaikovska, Robert Chehab, Vincenzo Guidi, Viktar Haurylavets, Andrea Mazzolari, Riccardo Negrello, Gianfranco Paterno, Marco Romagnoni, Alexei Sytov, Victor Tikhomirov
Summary: This work presents the most recent simulation results obtained on the development of a hybrid positron source for the FCC-ee, focusing on the features of both the crystalline radiator and the amorphous converter.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
Giovanni Della Casa, Nicola Zampa, Daniela Cirrincione, Simone Monzani, Marco Baruzzo, Riccardo Campana, Diego Cauz, Marco Citossi, Riccardo Crupi, Giuseppe Dilillo, Giovanni Pauletta, Fabrizio Fiore, Andrea Vacchi
Summary: The HERMES Pathfinder mission aims to develop a constellation of nanosatellites for studying astronomical transient sources. This study presents the results of using a novel inorganic scintillator to describe the persistent luminescence of a scintillating crystal after irradiation with high energy protons and ultraviolet light. The study demonstrates the suitability of this scintillator for the HERMES Pathfinder nanosatellites based on its low contribution to the detector's input current.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
A. L. Conley, B. Kelly, M. Spieker, R. Aggarwal, S. Ajayi, L. T. Baby, S. Baker, C. Benetti, I. Conroy, P. D. Cottle, I. B. D'Amato, P. Derosa, J. Esparza, S. Genty, K. Hanselman, I. Hay, M. Heinze, D. Houlihan, M. I. Khawaja, P. S. Kielb, A. N. Kuchera, G. W. Mccann, A. B. Morelock, E. Lopez-Saavedra, R. Renom, L. A. Riley, G. Ryan, A. Sandrik, V. Sitaraman, E. Temanson, M. Wheeler, C. Wibisono, I. Wiedenhover
Summary: We present a highly selective experimental setup for particle-γ coincidence experiments using fast CeBr3 scintillators for γ-ray detection at the Super-Enge Split-Pole Spectrograph (SE-SPS) of the John D. Fox Superconducting Linear Accelerator Laboratory at Florida State University (FSU). The characterization tests of the first five CeBr3 scintillation detectors of the CeBr3 Array (CeBrA) regarding energy resolution and timing characteristics are reported. The results of the first particle-γ coincidence experiments successfully performed with the CeBrA demonstrator and the FSU SE-SPS are also presented. It is demonstrated that the new setup allows for very selective measurements of γ-decay branching ratios and particle-γ angular correlations using narrow excitation energy gates, facilitated by the excellent particle energy resolution of the SE-SPS. Moreover, the determination of nuclear level lifetimes in the nanoseconds regime is highlighted by measuring the time difference between particle detection with the SE-SPS focal-plane scintillator and γ-ray detection with the fast CeBrA detectors. The selective excitation energy gates with the SE-SPS exclude any feeding contributions to these lifetimes.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
M. H. Kushoro, M. Angelone, D. Bozzi, G. Gorini, F. La Via, E. Perelli Cippo, M. Pillon, M. Tardocchi, M. Rebai
Summary: This paper presents the characterization of a series of SiC detectors operated with partial polarization, achieving excellent energy resolution and detection characteristics for both alpha particles and neutrons. The results demonstrate the potential of SiC detectors for fast neutron detection in fusion experiments. The limitations and challenges for manufacturing thick SiCs in the future are also discussed.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
A. Bravar, A. Buonaura, S. Corrodi, A. Damyanova, Y. Demets, L. Gerritzen, C. Grab, C. Martin Perez, A. Papa
Summary: This paper presents the development of a compact scintillating fiber detector for the Mu3e experiment. The detector aims to achieve accurate time measurements at very high particle rates. Different types of scintillating fibers were evaluated, and various assembly procedures were tested to achieve the best performance. The developed detector has a very thin thickness, high time resolution, and spatial resolution.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Instruments & Instrumentation
Jinlu Ruan, Liang Chen, Pengxiao Xu, Yapeng Zhang, Xue Du, Hongqiao Yin, Shiyi He, Fangbao Wang, Xun Zhang, Xiaoping Ouyang
Summary: A new SiC detector with a faster time response was developed to improve the temporal response of SiC-HPMTs. The improved SiC-HPMT showed significantly enhanced temporal response compared to the previous SiC-HPMT, and it can accurately measure the time information of fast pulsed radiation fields.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2024)
Article
Astronomy & Astrophysics
Bart Horn
Summary: We investigate asymptotic symmetries that preserve the Bondi gauge conditions but do not preserve the asymptotic falloff conditions for the metric near the null boundary and their connection to soft graviton theorems for scattering amplitudes.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
D. Dalmazi
Summary: Modern massive gravity theories address the historical tension between the absence of mass discontinuity and the absence of ghosts by introducing a fine-tuned gravitational potential and a sophisticated screening mechanism. Linearized nonlocal theories with exponential terms offer a solution to these issues and can be further extended to non-linear completions.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Wojciech Krynski
Summary: This study focuses on dispersionless Lax systems and proposes a systematic method for deriving new integrable systems from existing ones. Several examples, including the dispersionless Hirota equation, the generalized heavenly equation, and equations related to Veronese webs, are provided to demonstrate the effectiveness of the proposed method.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Jose P. S. Lemos, Oleg B. Zaslavskii
Summary: In this study, we investigate a black hole surrounded by a hot self-gravitating thin shell in the canonical ensemble. Using the Euclidean path integral approach, we derive the quantum statistical mechanics partition function of this matter-black hole system and obtain the thermodynamics of the system. We find that the total entropy is solely determined by the gravitational radius of the system and is not affected by the black hole inside the shell. We also determine the free energy, thermodynamic energy, and the temperature stratification along the system. Additionally, we establish the first law of thermodynamics and analyze the thermodynamic stability of the system through the calculation of the heat capacity.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Fawzi Aly, Dejan Stojkovic
Summary: In this study, we investigate the behavior of perturbation waves in the Teukolsky equation using horizon-penetrating coordinates. We find that the radial functions satisfy physical boundary conditions and the Hertz-Weyl scalar equations preserve their characteristics in these coordinates. Using the angular equation, we construct the metric perturbation for a perturber orbiting a black hole in Kerr spacetime in a horizon-penetrating setting and provide an explicit formula for the metric perturbation.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Robert Monjo
Summary: This paper proposes a modified gravity model that can explain the excess rotation of galaxies and mass-discrepancy acceleration, and it adjusts well to experimental data.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Ashkan Alibabaei, Philip K. Schwartz, Domenico Giulini
Summary: This study investigates the Dirac equation coupled to an external electromagnetic field in a four-dimensional curved spacetime with a given timelike worldline representing a classical clock. By using generalised Fermi normal coordinates and performing expansions, a weak-gravity post-Newtonian expression for the Pauli Hamiltonian of a spin-half particle in an external electromagnetic field is derived.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Gabriel Menezes
Summary: Multi-messenger astronomy provides us with the possibility of discovering phenomenological signatures of quantum-gravity effects. Feasible explorations within the effective field theory (EFT) treatment of general relativity have been discussed. Current techniques borrowed from modern amplitude methods were used to calculate leading quantum corrections to the classical radiated momentum and spectral waveforms. The results highlight the potential applications of the EFT approach in gravitational-wave physics. Furthermore, possible phenomenological surveys from the perspective of a UV completion for quantum gravity employing quadratic gravity were examined, revealing a deviation from the standard general-relativity prediction.
CLASSICAL AND QUANTUM GRAVITY
(2023)
