728 papers
The subatomic world is a realm where matter behaves in ways that defy our everyday intuition, and this category explores the fundamental building blocks of our universe. From the intricate dance of quarks inside a proton to the strange properties of electrons, these studies reveal the deep rules that govern everything from the smallest particles to the largest stars.
At Gist.Science, we track every new preprint in this field as it appears on arXiv, ensuring you stay ahead of the curve. For each discovery, we provide both a clear, plain-language explanation of the core ideas and a detailed technical summary for those who want to dive deeper into the mathematics and methodology.
Below are the latest papers in Atom-Ph, offering fresh insights into the structure and behavior of the atomic scale.
This paper theoretically and experimentally demonstrates that optimizing the phase modulation of the coupling beam in a hot Rydberg atom-based RF receiver significantly enhances its detection bandwidth, enabling the bridging of a 166 MHz gap between Rydberg transitions and outperforming conventional protocols for signals detuned by more than a few MHz.
This contribution proposes and demonstrates that the utilization of cascade decay pathways via nuclear excitation by inelastic electron scattering (NEIES) and nuclear excitation by electron capture (NEEC) in storage rings and electron beam ion traps can significantly increase the production yield of the Th isomer, thereby facilitating its application in nuclear clocks and precision metrology.
This paper investigates the isotopic dependence of collisional widths and shifts for the Hg clock transition perturbed by cold Rb atoms across a wide temperature range, demonstrating how shape resonances and reduced mass variations significantly influence collisional line shape parameters through both full quantum and semi-classical scattering calculations.
This paper presents a delay-programmable two-color femtosecond source based on a chirped-seed noncollinear optical parametric amplifier that enables flexible generation of independently tunable pulses with adjustable timing, which was successfully demonstrated in a COLTRIMS experiment on trapped lithium atoms to reveal delay-dependent multiphoton ionization pathways.
This paper presents a unified quantum-field-based theoretical framework that consistently describes both time-resolved x-ray and ultrafast electron diffraction, enabling a systematic comparison of these techniques and their application to simulating laser-driven electron dynamics in graphene.
This paper introduces MuDirac 1.3.0, a sustainable and efficient open-source software tool that enables the negative muon community to accurately calculate nuclear properties, such as the charge radius, by modeling muonic X-ray transition energies under a two-parameter Fermi distribution.
Using coupled-channel calculations on a Rb+KRb prototype model, the study reveals that near-threshold bound states with strong long-range character and weak short-range coupling can persist deep below thresholds, exhibiting long lifetimes and the potential to induce narrow Feshbach resonances while remaining largely immune to chaotic short-range dynamics and laser-induced destruction.
This paper reports a successful two-month international comparison of seven optical clocks across four European metrology institutes via a fiber network, achieving frequency ratio uncertainties as low as and providing critical data for the future redefinition of the SI second.
This paper demonstrates that subharmonic excitation of a quantum harmonic oscillator enables radio-frequency electric field measurements with precision surpassing the standard quantum limit while maintaining long coherence times through the use of classical input states.
This paper reports high-precision absolute frequency measurements of 2S-nS (n=8, 9, 10) two-photon transitions in cryogenic atomic hydrogen, yielding a proton charge radius of 0.8433(31) fm and a Rydberg frequency that align well with CODATA 2022 recommendations.