Publications (20)
High-precision, reference-free measurements of 2p 1s transitions in boron-like sulfur and argon
Louis Duval, Emily Lamour, Stéphane Macé +6
We have measured several 2p 1s transition energies in core-excited boron-like ions of sulfur and argon. The measurements are reference-free, with an accuracy of a few…
Coulomb dissociation of N
Marko Röder, Tatsuya Adachi, Yulia Aksyutina +120
Neutron-rich light nuclei and their reactions play an important role for the creation of chemical elements. Here, data from a Coulomb dissociation experiment on N are rep…
Direct Experimental Constraints on the Spatial Extent of a Neutrino Wavepacket
Joseph Smolsky, Kyle G Leach, Ryan Abells +35
Despite their high relative abundance in our Universe, neutrinos are the least understood fundamental particles of nature. They also provide a unique system to study quantum cohere…
The helion charge radius from laser spectroscopy of muonic helium-3 ions
The CREMA Collaboration, Karsten Schuhmann, Luis M. P. Fernandes +37
Hydrogen-like light muonic ions, in which one negative muon replaces all the electrons, are extremely sensitive probes of nuclear structure, because the large muon mass increases t…
Aluminum-Based Superconducting Tunnel Junction Sensors for Nuclear Recoil Spectroscopy
Spencer L. Fretwell, Connor Bray, Inwook Kim +31
The BeEST experiment is searching for sub-MeV sterile neutrinos by measuring nuclear recoil energies from the decay of Be implanted into superconducting tunnel junction (STJ) s…
Towards Precision Spectroscopy of Antiprotonic Atoms for Probing Strong-field QED
Gonçalo Baptista, Shikha Rathi, Michael Roosa +26
PAX (antiProtonic Atom X-ray spectroscopy) is a new experiment with the aim to test strong-field quantum electrodynamics (QED) effects by performing high-precision x-ray spectrosco…
MMC Array to Study X-ray Transitions in Muonic Atoms
Daniel Unger, Andreas Abeln, Thomas Elias Cocolios +19
The QUARTET collaboration aims to significantly improve the precision of the absolute nuclear charge radii of light nuclei from Li to Ne by using an array of metallic magnetic calo…
A Bayesian Approach for Strong Field QED Tests with He-like Ions
César Godinho, Jorge Machado, Nancy Paul +3
Detailed comparisons between theory and experiment for quantum electrodynamics (QED) effects in He-like ions have been performed in the literature to search for hints of new physic…
Nuclear Charge Radius of Be from Muonic Atom Spectroscopy Using a Microcalorimeter
Ofir Eizenberg, Shikha Rathi, Andreas Abeln +34
The authors measured the 2p→1s transition energy in muonic 9Be with a metallic magnetic calorimeter, obtaining a nuclear charge radius of 2.5506 fm with unprecedented precision, su…
Quantum interference effects in laser spectroscopy of muonic hydrogen, deuterium, and helium-3
Pedro Amaro, Beatrice Franke, Julian J. Krauth +9
Quantum interference between energetically close states is theoretically investigated, with the state structure being observed via laser spectroscopy. In this work, we focus on hyp…
Toward a Public and Secure Generative AI: A Comparative Analysis of Open and Closed LLMs
Jorge Machado
Generative artificial intelligence (Gen AI) systems represent a critical technology with far-reaching implications across multiple domains of society. However, their deployment ent…
Towards Precision Muonic X-Ray Measurements of Charge Radii of Light Nuclei
Ben Ohayon, Andreas Abeln, Silvia Bara +20
We propose an experiment to measure the nuclear charge radii of light elements with up to 20~times higher accuracy. These are essential both for understanding nuclear physics at lo…
Improved X-ray detection and particle identification with avalanche photodiodes
Marc Diepold, Luis M. P. Fernandes, Jorge Machado +36
Avalanche photodiodes are commonly used as detectors for low energy x-rays. In this work we report on a fitting technique used to account for different detector responses resulting…
Signal processing and spectral modeling for the BeEST experiment
Inwook Kim, Connor Bray, Andrew Marino +35
The Beryllium Electron capture in Superconducting Tunnel junctions (BeEST) experiment searches for evidence of heavy neutrino mass eigenstates in the nuclear electron capture decay…
Generative AI as a catalyst for democratic Innovation: Enhancing citizen engagement in participatory budgeting
Italo Alberto do Nascimento Sousa, Jorge Machado, Jose Carlos Vaz
This research examines the role of Generative Artificial Intelligence (AI) in enhancing citizen engagement in participatory budgeting. In response to challenges like declining civi…
Relativistic evaluation of the two-photon decay of the metastable ${1s}^{2} 2s 2p~^3\mbox{P}_0$ state in berylliumlike ions with an active-electron model
Pedro Amaro, Filippo Fratini, Laleh Safari +4
The two-photon ${1s}^{2} 2s 2p~^3\mbox{P}_0 \rightarrow {1s}^{2} {2s}^2$ $^1\mbox{S}_0$ transition in berylliumlike ions is theoretically investigated within a full relativistic fr…
Theoretical ab initio Evolution of Satellite Intensity near Threshold for Cu K-shell transitions
Daniel Pinheiro, Gonçalo Baptista, César Godinho +9
In this work, we have investigated the evolution of satellite intensity near the ionization threshold for Cu K-shell transitions through theoretical methods. Employing standard sta…
Shake-up and shake-off spectra in the electron capture decay of atomic Be
Mauro Guerra, Inwook Kim, Stephan Friedrich +33
The most stringent laboratory-based experimental limits on the existence of sub-MeV sterile neutrinos are currently set by decay spectroscopy of radioactive Be embedded into su…
Exploring AI Capabilities in Participatory Budgeting within Smart Cities: The Case of Sao Paulo
Italo Alberto Sousa, Mariana Carvalho da Silva, Jorge Machado +1
This research examines how Artificial Intelligence (AI) can improve participatory budgeting processes within smart cities. In response to challenges like declining civic participat…
Laser Spectroscopy of Muonic Atoms and Ions
Randolf Pohl, François Nez, Luis M. P. Fernandes +44
Laser spectroscopy of the Lamb shift (2S-2P energy difference) in light muonic atoms or ions, in which one negative muon is bound to a nucleus, has been performed. The measu…