Fundamental cosmology from ANDES precision spectroscopy
Sign Up to like & getrecommendations! Published in 2023 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stad1359
Abstract: Fundamental cosmology observations, such as the detection of the redshift drift and tests of the universality of physical laws, are key science and design drivers of the ArmazoNes high Dispersion Echelle Spectrograph (ANDES), an Extremely… read more here.
Keywords: spectroscopy; andes precision; cosmology andes; cosmology ... See more keywords
Precision Spectroscopy of the Pionic Helium-4.
Sign Up to like & getrecommendations! Published in 2022 at "Physical review letters"
DOI: 10.1103/physrevlett.128.183001
Abstract: The transition frequency of (n,ℓ)=(17,16)→(16,15) in pionic helium-4 is calculated to an accuracy of 4 ppb (parts per billion), including relativistic and quantum electrodynamic corrections up to O(R_{∞}α^{5}). Our calculations significantly improve the recent theoretical values… read more here.
Keywords: spectroscopy pionic; spectroscopy; pionic helium; precision spectroscopy ... See more keywords
Spectral narrowing of x-ray pulses for precision spectroscopy with nuclear resonances
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DOI: 10.1126/science.aan3512
Abstract: Spectral narrowing of x-rays Modern photon factories typically provide x-ray pulses that are orders of magnitude broader in frequency space than the corresponding atomic or nuclear resonances to be probed. For many spectroscopic applications, however,… read more here.
Keywords: nuclear resonances; spectral narrowing; ray pulses; precision spectroscopy ... See more keywords