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Revisiting Thomson's model with multiply charged superfluid helium nanodroplets.
J Chem Phys
December 2024
Departament FQA, Facultat de Física, Universitat de Barcelona, Av. Diagonal 645, 08028 Barcelona, Spain.
We study superfluid helium droplets multiply charged with Na+ or Ca+ ions. When stable, the charges are found to reside in equilibrium close to the droplet surface, thus representing a physical realization of Thomson's model. We find the minimum radius of the helium droplet that can host a given number of ions using a model whose physical ingredients are the solvation energy of the cations, calculated within the helium density functional theory approach, and their mutual Coulomb repulsion energy.
View Article and Find Full Text PDFDeciphering the Instability of the Black Hole Ringdown Quasinormal Spectrum.
Phys Rev Lett
November 2024
Department of Theoretical Physics and Gravitational Wave Science Center, 24 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland.
The spectrum of the quasinormal modes of the gravitational waves emitted during the ringdown phase following the merger of two black holes is of primary importance in gravitational astronomy. However, the spectrum is extremely sensitive to small disturbances of the system, thus potentially jeopardizing the predictions of the gravitational-wave observables. We offer an analytical and intuitive explanation of such an instability and its properties based on the transfer matrix approach of quantum mechanics.
View Article and Find Full Text PDFSearch for an eV-Scale Sterile Neutrino Using Improved High-Energy ν_{μ} Event Reconstruction in IceCube.
Phys Rev Lett
November 2024
Department of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Article Synopsis
- * The study introduces enhanced modeling techniques for neutrino flux and detector response, and it distinguishes between starting (inside) and throughgoing (outside) neutrino interaction events to improve energy resolution.
- * The findings indicate a best-fit point for the 3+1 model with sin²(2θ_{24})=0.16 and Δm_{41}²=3.5 eV², supporting previous studies while showing consistency with no evidence of sterile neutrinos, as reflected
Assessment of forensic medicine education impact on medical students' knowledge and specialisation attitudes: a multicenter analysis from Italian universities.
Int J Legal Med
November 2024
Department of Health Surveillance and Bioethics, Section of Legal Medicine, Università Cattolica del Sacro Cuore, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito, 1, 00168, Rome, Italy.
Introduction: This study aimed to assess students' knowledge, awareness, and attitudes regarding forensic-medicine concepts taught during a Medicine and Surgery degree program at eight Italian universities. Additionally, the study aimed to evaluate the impact of the course on students' knowledge and attitudes toward choosing medical residency.
Materials And Methods: A cross-sectional study was conducted through an anonymous web-based survey of medical students at eight italian universities.
Uniqueness of glasses prepared via x-ray induced yielding.
Rep Prog Phys
November 2024
Department of Physics and Astronomy 'Galileo Galilei', University of Padova, Via F. Marzolo, 8 - 35131 Padova, Italy.
Article Synopsis
- The yield point indicates when a solid starts to deform plastically under stress, which can also happen through x-ray irradiation.
- We studied the effects of x-ray irradiation on GeSe chalcogenide glasses with varying disorder levels, focusing on thermodynamics and structural dynamics.
- After prolonged irradiation at room temperature, the glasses reached a consistent yield state, showing increased disorder and higher energy compared to annealed glass, resembling properties of glass quenched from a significantly higher temperature.
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