Article
Astronomy & Astrophysics
Anibal D. Medina, Nicolas I. Mileo, Alejandro Szynkman, Santiago A. Tanco
Summary: The study focuses on the weakly interacting massive particle (WIMP) paradigm and investigates a specific Dirac fermion candidate for dark matter. The research finds that there are still unexplored regions in the parameter space and collider experiments may improve the current constraints. However, detecting the anomalous interactions between the Z' and the electroweak gauge bosons proves to be extremely challenging.
Article
Physics, Nuclear
A. Adamczak, A. Antognini, N. Berger, T. E. Cocolios, N. Deokar, Ch. E. Duellmann, A. Eggenberger, R. Eichler, M. Heines, H. Hess, P. Indelicato, K. Kirch, A. Knecht, J. J. Krauth, J. Nuber, A. Ouf, A. Papa, R. Pohl, E. Rapisarda, P. Reiter, N. Ritjoho, S. Roccia, M. Seidlitz, N. Severijns, K. von Schoeler, A. Skawran, S. M. Vogiatzi, N. Warr, F. Wauters
Summary: Muonic atom spectroscopy is a method used to measure the x rays emitted during the formation of a muonic atom, which provides information about the shape and size of nuclei. A new method has been developed that allows for the use of less target material while still maintaining efficiency. This method has been successfully demonstrated with the measurement of muonic x rays from a small gold target.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Multidisciplinary Sciences
Takuma Yamashita, Yasushi Kino, Kenichi Okutsu, Shinji Okada, Motoyasu Sato
Summary: This article introduces a new kinetics model of muon catalyzed fusion, which includes three roles: changing isotopic population, producing epi-thermal muonic atoms, and inducing fusion in-flight. The model reproduces experimental observations under a wide range of conditions in high-temperature gas targets and can be tested through measurements of radiative dissociation X-rays.
SCIENTIFIC REPORTS
(2022)
Article
Astronomy & Astrophysics
Andrea Caputo, Georg Raffelt, Edoardo Vitagliano
Summary: This research focuses on deriving supernova bounds on muon-philic bosons, considering factors like scalar phi and pseudoscalar a, as well as the generic two-photon coupling implied by a muon triangle loop. The results show that SN arguments become interesting mainly for larger boson masses, and constraints are derived based on SN 1987A gamma rays and the diffuse cosmic gamma-ray background. The study also discusses the implications on boson emission in different scenarios like escaping freely from the SN core or being in the trapping regime.
Article
Materials Science, Multidisciplinary
Tal Zaharoni, Dan Yunger, Neeraj Mishra, Inbal Gavish Segev, Arik Kraisel, Eyal Yahel, Guy Makov
Summary: The study found that high-energy proton irradiation can result in increased hardness and volume expansion in tantalum, with hydrogen occupying mainly interstitial sites in the Ta lattice and extensive diffusion observed in the material. No blistering was observed, suggesting that tantalum is a promising structural material in proton radiation environments.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Physics, Nuclear
Bijaya Acharya, Vadim Lensky, Sonia Bacca, Mikhail Gorchtein, Marc Vanderhaeghen
Summary: This study combines the dispersive relation approach and the ab initio method in nuclear physics to compute nuclear structure corrections to the Lamb shift in muonic deuterium, testing the validity of chiral effective field theory. The research shows that an improved accuracy is obtained by applying this hybrid method compared to using available experimental data in the analysis.
Article
Optics
X. M. Tong, D. Kato, T. Okumura, S. Okada, T. Azuma
Summary: We have developed a method using relativistic density-functional theory with a self-interaction correction that is simple, fast, and reasonably accurate. Comparisons with measured Kα lines and their hypersatellites for different atoms revealed that the relativistic local density approximation is suitable for Kα lines, while the relativistic local spin density approximation with a self-interaction correction is better for Khα hypersatellites. The relativistic effect was found to be significant, even for middle-Z atoms like Cu, with a difference of about 100 eV compared to nonrelativistic density-functional theory. The paper also discusses the screening effects and conduction band from inner shell to outer shell. Overall, the present paper provides a comprehensive understanding of the transition lines of muonic atoms and their implications for experimental measurements.
Article
Chemistry, Multidisciplinary
Yan-Hua Fu, Zhen Wang, Kai Wang, Guang-Bin Shen, Xiao-Qing Zhu
Summary: This study investigates and compares the antioxidant abilities of five bioactive antioxidants in chemical reactions, finding that iAscH(-) is the best hydrogen atom donor both thermodynamically and kinetically. It demonstrates the feasibility of accurately predicting the antioxidant abilities of antioxidants using thermo-kinetic parameters.
Article
Materials Science, Multidisciplinary
A. Makarochkin, E. Yahel, G. Makov
Summary: Tungsten and tungsten alloys are used as structural materials in nuclear facilities due to their excellent mechanical and thermal properties. Blistering, as a primary failure mechanism, may shorten the erosion lifetime of components. Recent studies have found larger blisters formed from MeV proton irradiation compared to keV irradiation. A model of blister growth under irradiation, combining plate bending and crack propagation mechanisms, is developed. The model is evaluated by comparing with experimental results from MeV proton irradiation on tungsten. The effect of irradiation on material properties is discussed in the context of the model and experimental results.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Physics, Multidisciplinary
Yihao Hu, Peng Kuang, Chong Li, Fuyan Liu, Haibiao Wu, Detao Xiao, Peng Zhang, Baoyi Wang, Xingzhong Cao, Long Wei
Summary: In this study, the simulation of muonic atoms in multi-elemental targets using Geant4 Monte Carlo software toolkit is performed, and a method for reconstructing the production sites of muonic atoms from the momentum of mu-X rays is proposed. The imaging results show a high spatial resolution of 0.1 mm and an increased detection efficiency compared to the 3-mm pinhole imaging technique. Moreover, analysis of the image quality index reveals superior image quality for elements with high and medium atomic numbers. The proposed method has the potential to become an accurate and efficient technique for determining the distribution of elements.
Article
Physics, Multidisciplinary
Yevgeny Stadnik
Summary: Ultralight scalar dark matter may cause apparent oscillations in the muon mass, which can be directly detected through temporal shifts in the spectra of muonium and muonic atoms. Current datasets and ongoing spectroscopy measurements can test the interactions between scalar muons with a stringency up to 12 orders of magnitude higher than astrophysical limits. Ongoing free-fall experiments can probe forces associated with the exchange of virtual ultralight scalar bosons between muons and particles in the standard model, offering a sensitivity improvement of up to 5 orders of magnitude compared to laboratory and astrophysical limits.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Maxim Perelstein, Yik Chuen San
Summary: The proposed model suggests a new quantum force between muons and nucleons mediated by dark matter particle exchanges, resolving the proton charge radius puzzle and accommodating the discrepancy in the measured anomalous magnetic moment of the muon and the Standard Model prediction. Additionally, the thermal relic abundance of the dark matter candidate is consistent with observations, with the dark matter particle mass being in the MeV range. The model is shown to be consistent with various experimental and observational constraints.
Article
Physics, Nuclear
Vadim Lensky, Franziska Hagelstein, Vladimir Pascalutsa
Summary: We present a study of the two-photon-exchange corrections to the S-levels in muonic and ordinary deuterium. The calculation is done within the pionless effective field theory and proceeds up to next-to-next-to-next-to-leading order in the expansion. Our findings suggest a larger elastic 2 γ-exchange contribution in muonic deuterium compared to other recent calculations. We also identify a correlation between the deuteron charge and Friar radii, which helps to assess the accuracy of a form factor parametrization. Higher-order 2 γ-exchange contributions are evaluated and their uncertainty is quantified using a Bayesian approach. The extracted deuteron charge radius from different observables is found to be in perfect agreement when taking into account the respective 2 γ-exchange effects.
EUROPEAN PHYSICAL JOURNAL A
(2022)
Article
Multidisciplinary Sciences
Julian J. Krauth, Karsten Schuhmann, Marwan Abdou Ahmed, Fernando D. Amaro, Pedro Amaro, Francois Biraben, Tzu-Ling Chen, Daniel S. Covita, Andreas J. Dax, Marc Diepold, Luis M. P. Fernandes, Beatrice Franke, Sandrine Galtier, Andrea L. Gouvea, Johannes Goetzfried, Thomas Graf, Theodor W. Haensch, Jens Hartmann, Malte Hildebrandt, Paul Indelicato, Lucile Julien, Klaus Kirch, Andreas Knecht, Yi-Wei Liu, Jorge Machado, Cristina M. B. Monteiro, Francoise Mulhauser, Boris Naar, Tobias Nebel, Francois Nez, Joaquim M. F. dos Santos, Jose Paulo Santos, Csilla I. Szabo, David Taqqu, Joao F. C. A. Veloso, Jan Vogelsang, Andreas Voss, Birgit Weichelt, Randolf Pohl, Aldo Antognini, Franz Kottmann
Summary: The energy levels of hydrogen-like atomic systems can be calculated with great precision, which can be used to study nuclear structure. Through measuring the root-mean-square charge radius of the proton and comparing it with the value from electron scattering, it provides a benchmark for few-nucleon theories, lattice quantum chromodynamics, and electron scattering. The agreement also constrains several beyond-standard-model theories proposed to explain the proton-radius puzzle, establishing spectroscopy of light muonic atoms and ions as a precise tool for studies of nuclear properties.
Article
Physics, Multidisciplinary
C. Pizzolotto, A. Sbrizzi, A. Adamczak, D. Bakalov, G. Baldazzi, M. Baruzzo, R. Benocci, R. Bertoni, M. Bonesini, H. Cabrera, D. Cirrincione, M. Clemenza, L. Colace, M. Danailov, P. Danev, A. de Bari, C. De Vecchi, M. De Vincenzi, E. Fasci, F. Fuschino, K. S. Gadedjisso-Tossou, L. Gianfrani, K. Ishida, C. Labanti, V Maggi, R. Mazza, A. Menegolli, E. Mocchiutti, S. Monzani, L. Moretti, G. Morgante, J. Niemela, A. Pullia, R. Ramponi, L. P. Rignanese, M. Rossella, M. Stoilov, L. Stoychev, J. J. Suarez-Vargas, L. Tortora, E. Vallazza, A. Vacchi
Summary: The study measured the temperature dependence of muon transfer rate from muonic hydrogen to oxygen for the first time, with results showing an increase in transfer rate with temperature in the range of 104-300 K. The 2018 experiment expanded the measurement towards lower and higher temperatures, confirming the temperature dependence observed in 2016 and providing a solid foundation for comparison with theoretical predictions.