| |
DUNE Collaboration(Abud, A. A. et al), Amar Es-Sghir, H., Amedo, P., Antonova, M., Barenboim, G., Benitez Montiel, C., et al. (2025). Performance of a Modular Ton-Scale Pixel-Readout Liquid Argon Time Projection Chamber. Instrum., 8(3), 41–45pp.
Abstract: The Module-0 Demonstrator is a single-phase 600 kg liquid argon time projection chamber operated as a prototype for the DUNE liquid argon near detector. Based on the ArgonCube design concept, Module-0 features a novel 80k-channel pixelated charge readout and advanced high-coverage photon detection system. In this paper, we present an analysis of an eight-day data set consisting of 25 million cosmic ray events collected in the spring of 2021. We use this sample to demonstrate the imaging performance of the charge and light readout systems as well as the signal correlations between the two. We also report argon purity and detector uniformity measurements and provide comparisons to detector simulations.
|
|
Domcke, V., Garcia-Cely, C., & Lee, S. M. (2025). Gravitational wave scattering on magnetic fields. J. Cosmol. Astropart. Phys., 11(11), 016–48pp.
Abstract: The conversion of gravitational to electromagnetic waves in the presence of background magnetic fields is known as the inverse Gertsenshtein effect, analogous to the in the far-field regime of a magnetized region, we derive the angular distribution of the intensity and polarization of the emitted electromagnetic waves. We discuss the interplay of the internal structure of the magnetic field, the polarization of the gravitational wave and the scattering angle, demonstrating for example that a dipolar field can convert an unpolarized stochastic gravitational wave background into polarized electromagnetic emission, with peak emission intensity along the equator. We moreover outline how to incorporate medium effects in this framework, necessary for a realistic 3D description of gravitational wave to photon conversion in the magnetosphere of neutron stars.
|
|
KM3NeT Collaboration(Adriani, O. et al), Alves Garre, S., Bariego-Quintana, A., Calvo, D., Cecchini, V., Garcia Soto, A., et al. (2025). Ultrahigh-Energy Event KM3-230213A within the Global Neutrino Landscape. Phys. Rev. X, 15(3), 031016–13pp.
Abstract: On February 13th, 2023, the KM3NeT/ARCA telescope detected a neutrino candidate with an estimated energy in the hundreds of PeV. In this article, the observation of this ultrahigh-energy neutrino is discussed in light of null observations above tens of PeV from the IceCube and Pierre Auger observatories. Performing a joint fit of all experiments under the assumption of an isotropic E-2 flux, the best-fit single-flavor flux normalization is E-2 Phi(1f)(nu+(nu) over bar) = 7.5 x 10(-10) GeV cm(-2) s(-1) sr(-1) in the 90% energy range of the KM3NeT event. Furthermore, the ultrahigh-energy data are then fit together with the IceCube measurements at lower energies, either with a single power law or with a broken power law, allowing for the presence of a new component in the spectrum. A slight preference for a break in the PeV regime is found for one of the three investigated IceCube samples and no such preference for the other two. In all cases, the observed tension between KM3NeT and other datasets is mild to moderate (1.6s-2.9s), and increased statistics are required to resolve this apparent tension and better characterize the neutrino landscape at ultrahigh energies.
|
|
n_TOF Collaboration(Michalopoulou, V. et al), Balibrea-Correa, J., Domingo-Pardo, C., Ladarescu, I., Lerendegui-Marco, J., & Tarifeño-Saldivia, A. (2025). Measurement of the 235U fission cross section relative to the standard 10B(n, α) reaction at the CERN n_TOF facility: Results for En < 2 eV. Appl. Radiat. Isot., 226, 112063–7pp.
Abstract: The neutron induced fission of U-235 is a very important reaction for nuclear technology applications and for the design of future systems to produce clean and safe energy. In addition, it is used as a reference reaction for neutron cross-section measurements, thus, its cross section is needed with a high accuracy over a wide energy range. In this work, the measurement for the U-235(n,f) reaction was carried out at the n_TOF facility located at CERN, at experimental area EAR-2. The standard B-10(n, alpha) reaction was used as reference, while a setup based on the gaseous Micromegas detectors was implemented for the detection of the fission fragments and alpha and 7Li-particles of the two reactions, respectively. In order to determine the thickness of the B-10 sample NRA measurements were carried out at the National Center for Scientific Research ''Demokritos''.
|
|
Lima Junior, H. C. D., Magalhaes, R. B., Olmo, G. J., & Rubiera-Garcia, D. (2025). On the resolution of space-time singularities in spherically symmetric black holes: geodesic completeness, curvature scalars, and tidal forces. Class. Quantum Gravity, 42(22), 225004–34pp.
Abstract: The existence of black holes in the Universe is nowadays established on the grounds of a blench of astrophysical observations, most notably those of gravitational waves from binary mergers and the imaging of supermassive objects at the heart of M87 and Milky Way galaxies. However, this success of Einstein's general relativity (GR) to connect theory of black holes with observations is also the source of its doom, since Penrose's theorem proves that, under physically sensible conditions, the development of a space-time singularity (as defined by the existence of a focal point for some geodesic paths in finite affine time) within black holes as described by GR is unavoidable. In this work, we thoroughly study how to resolve space-time singularities in spherically symmetric black holes. To do it so we find the conditions on the metric functions required for the restoration of geodesic completeness without any regards to the specific theory of the gravitational and matter fields supporting the amended metric. Our discussion considers both the usual trivial radial coordinate case and the bouncing radial function case and arrives to two mechanisms for this restoration: either the focal point is displaced to infinite affine distance or a bounce prevents the focusing of geodesics. Several explicit examples of well known (in)complete space-times are given. Furthermore, we consider the connection of geodesic (in)completeness with another criterion frequently used in the literature to monitor singular space-times: the blow up of (some sets of) curvature scalars and the infinite tidal forces they could bring with them, and discuss the conditions required for the harmlessness upon physical observers according to each criterion.
|
|
|
