Magneto-optical trapping of radioactive atoms for test of the fundamental symmetries

Kawamura, H.; Ando, S.; Aoki, T.; Arikawa, H.; Harada, K.; Hayamizu, T.; Inoue, Takeshi; Ishikawa, Tetsuya; Itoh, Masatoshi; Kato, K.; Köhler, Laura; Mathis, John E.; Sakamoto, Kenkichi; Uchiyama, A.; Sakemi, Y.

doi:10.1007/s10751-015-1193-1

Cited by 9 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The radioactive Fr atoms, whose enhancement factor is 895, trapped by laser cooling and trapping techniques are one of the strongest candidates for measuring the eEDM. The first manipulation of Fr atom with the magneto-optical trap (MOT) begins in 1996 at University of New York and more recently in Japan. − When atoms and ions are trapped together, the ions attract the atoms by their static electric field and sometimes lead to inelastic collisions. So far, charge-exchange collisions have been studied in ultracold atom-ion hybrid systems .…”

Section: Introductionmentioning

confidence: 99%

Non-Relativistic Electronic-Structure Computation of Neutral and Cationic Systems [Fr₂, Fr–AEM⁺ (AEM= Ca, Sr, Ba)]

Jellali

Habli

2022

J. Phys. Chem. A

View full text Add to dashboard Cite

The experimental field of ultracold ion-atom mixtures including an alkali-metal atom and an alkaline-earthmetal ion as well as of homonuclear alkali dimers has paved the way for creating and manipulating the ultracold molecules. The present paper is focused on a study of molecules such us francium dimer and a comparative spectroscopic investigation of the cationic systems Fr−(Ca + , Sr + , Ba + ). We adopt a computational scheme without spin−orbit coupling reposed on the full configuration interaction and semi-empirical pseudo-potential theory of the atomic cores Fr + , Ca 2+ , Sr 2+ , and Ba 2+ with extended and optimized basis sets. We have determined the adiabatic potentials with their relative spectroscopic constants, the electric dipole moments and the vibrational levels spacings for the 1,3 Σ u,g + and 1,3 Σ + electronic states for Fr 2 and Fr−AEM + , respectively, correlated toward {Fr(7s) + Fr(7s, 7p, 6d, 8s, 8p)}, {Ca(4s 2 , 4s4p, 4s3d), Sr(5s 2 , 5s5p, 5s4d), Ba(6s 2 , 6s6p, 6s5d) + Fr + }, and {Ca + (4s, 3d), Sr + (5s, 4d), Ba + (6s, 5d) + Fr(7s, 7p)}. The accuracy and reliability of the current results are discussed by comparing with theoretical data available in the literature. The occurrence of some avoided crossings between the neighboring electronic states is leading to a charge or excitation transfer for atom−ion collisions in the diverse charge or excited states. The Σ + −Σ + transitions are determined in order to evaluate the future radiative lifetimes of vibrational states serving the direct laser cooling.

show abstract

Section: Introductionmentioning

confidence: 99%

Non-Relativistic Electronic-Structure Computation of Neutral and Cationic Systems [Fr₂, Fr–AEM⁺ (AEM= Ca, Sr, Ba)]

Jellali

Habli

2022

J. Phys. Chem. A

View full text Add to dashboard Cite

show abstract

“…The Fr atom is considered as a potential system to search for the electron electric dipole moment (EDM) and the corresponding magneto-optical trap experiment is under preparation in Japan [1][2][3]. The nonzero value of the electron EDM implies manifestation of effects which violate both time-reversal (T) and spatial parity (P) symmetries.…”

Section: Introductionmentioning

confidence: 99%

Scalar-pseudoscalar interaction in the francium atom

2017

View full text Add to dashboard Cite

Fr atom can be successively used to search for the atomic permanent electric dipole moment (EDM) [Hyperfine Interactions 236, 53 (2015); Journal of Physics: Conference Series 691, 012017 (2016)]. It can be induced by the permanent electron EDM predicted by modern extensions of the standard model to be nonzero at the level accessible by the new generation of EDM experiments. We consider another mechanism of the atomic EDM generation in Fr. This is caused by the scalar-pseudoscalar nucleus-electron neutral current interaction with the dimensionless strength constant, kT,P . Similar to the electron EDM this interaction violates both spatial parity and timereversal symmetries and can also induce permanent atomic EDM. It was shown in [Phys. Rev. D 89, 056006 (2014)] that the scalar-pseudoscalar contribution to the atomic EDM can dominate over the direct contribution from the electron EDM within the standard model. We report highaccuracy combined all-electron and two-step relativistic coupled cluster treatment of the effect from the scalar-pseudoscalar interaction in the Fr atom. Up to the quadruple cluster amplitudes within the the coupled cluster method with single, double, triple, and noniterative quadruple amplitudes, CCSDT(Q), were included in correlation treatment. This calculation is required for the interpretation of the experimental data in terms of kT,P . The resulted EDM of the Fr atom expressed in terms of kT,P is dFr = kT,P · 4.50 · 10 −18 e · cm, where e is the charge of the electron. The value of the ionization potential of the 2 S 1/2 ground state of Fr calculated within the same methods is in very good agreement with the experimental datum.

show abstract

“…3. The trapping efficiency is less than 1% at present, due to the loss of the atoms by sticking to the inner wall of the tube connected from the neutralizer to the MOT cell, and the velocity of the atoms are too fast compared to the capture range of the MOT [11]. The trapping efficiency can be improved by the transverse cooling to collimate the Fr beam and by longitudinal laser cooling for the deceleration of the velocity (Zeeman slower).…”

Section: Magneto-optical Trap Of Neutral Fr Atomsmentioning

confidence: 99%

Fundamental physics with cold radioactive atoms

Sakemi

Aoki

Calabrese

et al. 2021

Proceedings of the 14th Asia-Pacific Physics Conference

Self Cite

View full text Add to dashboard Cite

The fundamental symmetries, charge conjugation (C), parity (P) and time reversal (T), play a significant role in the Standard Model (SM) of elementary particle physics. Of these, T symmetry and the combined CP symmetry are the least well understood, and they hold valuable clues for unraveling the secrets of nature. All subatomic particles are postulated to possess an intrinsic property known as a permanent electric dipole moment (EDM). The EDM of an atom is a combination of those of each constituent particle and also CP-violating interactions between the particles. Being manyparticle systems, atoms and molecules are ideal candidates for probing a rich variety of both T-and CP-violating interactions. Paramagnetic atoms, which have a single valence electron in their outer shell, are sensitive to subtle signals associated with CP violations in the leptonic sector, i.e., the EDM of the electron. At present, we are developing a highintensity laser-cooled Fr factory at RIKEN accelerator facility in an attempt to evaluate the EDM of Fr to an accuracy of 10 -30 ecm. Laser cooling is important for achieving highly accurate EDM measurements, since it allows long interaction times using an optical lattice. The current status of the laser-cooled Fr EDM experiments is presented in this paper. PHYSICS MOTIVATIONSSince an electron is a point particle with a non-zero spin, it may possess an intrinsic EDM, although the electron EDM (e-EDM) is predicted to be very small by many particle physics models. The magnetic dipole moment of the electron has been measured to a precision of just a few parts in a hundred trillion, which is the most accurate verification of a quantum electrodynamics prediction in the history of physics. However, its counterpart, the e-EDM, is still speculative. If the e-EDM was identified, it could be used to indirectly investigate particles with masses of tera electron Volts or higher, which are beyond the reach of even planned high-energy particle colliders. The mass hierarchy of super-symmetry (SUSY) particles could also be studied [1]. Experimental searches for the e-EDM are currently being carried out using neutral atoms such as thallium(Tl) and francium(Fr), molecules such as ytterbium monofluoride(YbF) and thorium monoxide(ThO) [2], and solid-state materials. Although no conclusive result has yet been obtained, some upper limits have been established.The magnitude of the coupling constant is so small that the current experimental sensitivity about 10 -29 ecm needs to be improved by almost ten orders of magnitude to test the prediction of the SM (10 -38 ecm), which appears

show abstract

Magneto-optical trapping of radioactive atoms for test of the fundamental symmetries

Cited by 9 publications

References 16 publications

Non-Relativistic Electronic-Structure Computation of Neutral and Cationic Systems [Fr₂, Fr–AEM⁺ (AEM= Ca, Sr, Ba)]

Non-Relativistic Electronic-Structure Computation of Neutral and Cationic Systems [Fr₂, Fr–AEM⁺ (AEM= Ca, Sr, Ba)]

Scalar-pseudoscalar interaction in the francium atom

Fundamental physics with cold radioactive atoms

Contact Info

Product

Resources

About

Magneto-optical trapping of radioactive atoms for test of the fundamental symmetries

Cited by 9 publications

References 16 publications

Non-Relativistic Electronic-Structure Computation of Neutral and Cationic Systems [Fr2, Fr–AEM+ (AEM= Ca, Sr, Ba)]

Non-Relativistic Electronic-Structure Computation of Neutral and Cationic Systems [Fr2, Fr–AEM+ (AEM= Ca, Sr, Ba)]

Scalar-pseudoscalar interaction in the francium atom

Fundamental physics with cold radioactive atoms

Contact Info

Product

Resources

About

Non-Relativistic Electronic-Structure Computation of Neutral and Cationic Systems [Fr₂, Fr–AEM⁺ (AEM= Ca, Sr, Ba)]

Non-Relativistic Electronic-Structure Computation of Neutral and Cationic Systems [Fr₂, Fr–AEM⁺ (AEM= Ca, Sr, Ba)]