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21 papers · 2 filters
Asymptotic behavior of photoionization cross section in a central field. Ionization of the states
E. G. Drukarev, A. I. Mikhailov
We continue our studies of the high energy nonrelativistic asymptotics for the photoionization cross section of the systems bound by a central field . We consider the bound s…
Accurate Evaluation of ,-odd Faraday Effect in Atoms of Xe and Hg
D. V. Chubukov, L. V. Skripnikov, L. N. Labzowsky +2
Accurate evaluation of the ,-odd Faraday effect (rotation of the polarization plane for the light propagating through a medium in presence of an external…
Interference between and transition amplitudes on the to transition in ThO
A. N. Petrov, L. V. Skripnikov
Calculations of Stark interference between and transition amplitudes on the to transition in ThO is performed. Calculations are required for estimations o…
HfF as a candidate to search for the nuclear weak quadruple moment
L. V. Skripnikov, A. N. Petrov, A. V. Titov +1
Nuclei with a quadrupole deformation such as Hf have enhanced weak quadrupole moment which induces the tensor weak electron-nucleus interaction in atoms and molecules. Corr…
Hyperfine induced transitions 1S0 - 3D1 in Yb
M. G. Kozlov, V. A. Dzuba, V. V. Flambaum
Parity violation experiment in Yb is made on the strongly forbidden M1 transition 6s^2 1S0 \to 5d6s 3D1. The hyperfine mixing of the 5d6s 3D1 and 5d6s 3D2 levels opens E2 channel,…
Ionization-excitation of helium-like ions at Compton scattering
A. I. Mikhailov, A. V. Nefiodov
Ionization of helium-like ions with simultaneous excitation of the ns-states due to photon scattering is considered. The differential and total cross sections of the process are ca…
Many body study of -factor in boron-like argon
Daniel E. Maison, Leonid V. Skripnikov, Dmitry A. Glazov
Highly accurate measurements of the -factor of boronlike Ar are currently implemented within the ARTEMIS experiment at GSI (Darmstadt, Germany) and within the ALPHATRAP experime…
Dynamic polarizability measurements in Lu
K. J. Arnold, R. Kaewuam, T. R. Tan +3
We measure the differential polarizability of the Lu -to- clock transition at multiple wavelengths. This experimentally characterizes the differential…
Nobelium energy levels and hyperfine structure constants
S. G. Porsev, M. S. Safronova, U. I. Safronova +2
Advances in laser spectroscopy of superheavy () elements enabled determination of the nuclear moments of the heaviest nuclei, which requires high-precision atomic calculatio…
Optical clock comparison test of Lorentz symmetry
Christian Sanner, Nils Huntemann, Richard Lange +4
Questioning the presumably most basic assumptions about the structure of space and time has revolutionized our understanding of Nature. State-of-the-art atomic clocks make it possi…
Evaluation of CP-violation in HfF
A. N. Petrov, L. V. Skripnikov, A. V. Titov +1
CP violation effects produced by the nuclear magnetic quadrupole moment (MQM), electron electric dipole moment (EDM) and scalarpseudoscalar nucleuselectron neutral current (S…
Sensitivity coefficients to variation of fundamental constants
M. G. Kozlov, D. Budker
Atoms and molecules can serve as sensitive probes of a possible variation of the fine structure constant and electron-to-proton mass ratio . Two types of sensitivity coeffic…
Nuclear charge radii of Th from isotope and isomer shifts
M. S. Safronova, S. G. Porsev, M. G. Kozlov +5
The isotope Th is unique in that it possesses an isomeric state of only a few eV above the ground state, suitable for nuclear laser excitation. An optical clock based on th…
Clock-related properties of Lu+
S. G. Porsev, U. I. Safronova, M. S. Safronova
The singly-ionized lutetium has a number of fortuitous properties well suited for a design of an optical clock and corresponding applications. In this work, we study Lu+ properties…
Calculation of francium hyperfine anomaly
E. A. Konovalova, Yu. A. Demidov, M. G. Kozlov +1
The Dirac-Hartree-Fock plus many-body perturbation theory (DHF+MBPT) method has been used to calculate hyperfine structure constants for Fr. Calculated hyperfine structure anomaly…
Enhanced nuclear spin dependent parity violation effects using the 199HgH molecule
A. J. Geddes, L. V. Skripnikov, A. Borschevsky +3
Electron interactions with the nuclear-spin-dependent (NSD) parity non-conserving (PNC) anapole moment are strongly enhanced within heteronuclear diatomic molecules. A novel, low-e…
Highly charged ions: optical clocks and applications in fundamental physics
M. G. Kozlov, M. S. Safronova, J. R. Crespo López-Urrutia +1
Recent developments in frequency metrology and optical clocks have been based on electronic transitions in atoms and singly charged ions as references. These systems have enabled r…
New Nuclear Magnetic Moment of Bi - Resolving the Bismuth Hyperfine Puzzle
Leonid V. Skripnikov, Stefan Schmidt, Johannes Ullmann +9
A recent measurement of the hyperfine splitting in the ground state of Li-like Bi has established a "hyperfine puzzle" -- the experimental result exhibits a 7 de…
Photoionization of the bound systems at high energies
E. G. Drukarev, A. I. Mikhailov
We consider photoionization of a system bound by the central potential . We demonstrate that the high energy nonrelativistic asymptotics of the photoionization cross section…
Two clock transitions in neutral Yb for the highest sensitivity to variations of the fine-structure constant
M. S. Safronova, S. G. Porsev, Christian Sanner +1
We propose a new frequency standard based on a transition in neutral Yb. This transition has a potential for high stability and acc…
Constraints on exotic spin-dependent interactions between matter and antimatter from antiprotonic helium spectroscopy
Filip Ficek, Pavel Fadeev, Victor V. Flambaum +4
Heretofore undiscovered spin-0 or spin-1 bosons can mediate exotic spin-dependent interactions between standard-model particles. Here we carry out the first search for semileptonic…