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10 pages, 746 KiB

Open AccessCommunication

Three Particle Muon-Electron Bound Systems in Quantum Electrodynamics

by Alexey V. Eskin, Vladimir I. Korobov, Alexei P. Martynenko and Fedor A. Martynenko

Atoms 2023, 11(2), 25; https://doi.org/10.3390/atoms11020025 - 31 Jan 2023

Cited by 3 | Viewed by 2921

The muonic 2P-2S Lamb shift in muon-electron atoms and ions of helium, lithium, beryllium, and boron with the electron in the ground state was calculated by the perturbation theory using the fine structure constant and the electron-muon mass ratio. The corrections of first- and second-orders of perturbation theory on the Coulomb interaction and nucleus recoil were taken into account. The obtained analytical results were validated numerically using calculations within the variational method. Full article

(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)

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8 pages, 413 KiB

Open AccessCommunication

Classical Dynamics of Rydberg States of Muonic-Electronic Helium and Helium-Like Ions in a Weak Electric Field: Counter-Intuitive Linear Stark Effect

by Eugene Oks

Dynamics 2021, 1(1), 1-8; https://doi.org/10.3390/dynamics1010001 - 23 Mar 2021

Viewed by 2672

Abstract

According to the existing paradigm, helium atoms and helium-like ions (hereafter, heliumic systems) in a relatively weak external static electric field do not exhibit the linear Stark effect—in distinction to hydrogen atoms and hydrogen-like ions. In the present paper we consider the classical dynamics of a muonic-electronic heliumic system in Rydberg states–starting from the concept from our previous paper. We show that there are two states of the system where the averaged electric dipole moment is non-zero. Consequently, in these states the heliumic system should exhibit the linear Stark effect even in a vanishingly small electric field, which is a counter-intuitive result. We also demonstrate the possibility of controlling the overall precession of the electronic orbit by an external electric field. In particular, we show the existence of a critical value of the external electric field that would “kill” the precession and make the electronic orbit stationary. This is another counter-intuitive result. We calculate analytically the value of the critical field and show that it is typically smaller or even much smaller than 1 V/cm. Full article

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5 pages, 350 KiB

Open AccessProceeding Paper

Overview on Heavy-Flavour at RHIC and LHC

by Andrea Dubla

Proceedings 2019, 10(1), 29; https://doi.org/10.3390/proceedings2019010029 - 16 Apr 2019

Viewed by 1576

Abstract

The PHENIX and STAR Collaborations at the Relativistic Heavy-Ion Collider and ALICE, CMS, ATLAS and LHCb Collaborations at the Large Hadron Collider have measured the production of charmonium and bottonium states as well as open heavy flavor hadrons via their hadronic and semi-leptonic decays at mid-rapidity and in the semi-muonic decay channel at forward rapidity in pp, p–A and A–A collisions in an energy domain that ranges from

\sqrt{s}

= 0.2 TeV to

\sqrt{s}

= 13 TeV in pp collisions and from

\sqrt{s_{NN}}

= 0.2 TeV to

\sqrt{s_{NN}}

= 5.02 TeV in A–A collisions. In this contribution the latest experimental results will be reviewed. Full article

(This article belongs to the Proceedings of Hot Quarks 2018—Workshop for Young Scientists on the Physics of Ultrarelativistic Nucleus-Nucleus Collisions)

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8 pages, 294 KiB

Open AccessArticle

The Possibility of Measuring Nuclear Shapes by Using Spectral Lines of Muonic Ions

by Eugene Oks

Atoms 2018, 6(2), 14; https://doi.org/10.3390/atoms6020014 - 1 Apr 2018

Cited by 6 | Viewed by 3267

Abstract

We analytically calculated the shift of spectral lines of hydrogenlike ions for non-spherical nuclear shapes, such as the oblate or prolate ellipsoid of revolution. We show that the allowance for the ellipsoidal nuclear shape can change the shift of spectral lines of muonic hydrogenlike ions by several times compared to the corresponding shift for spherical nuclei. This can serve as an additional method for the experimental determination of the quadrupole moment of nuclei and of the standard beta-parameter related to the quadrupole moment. Full article

(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)

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