Radioactive ion beam transportation for the fundamental symmetry study with laser-trapped atoms

Arikawa, H.; Ando, S.; Aoki, T.; Ezure, S.; Harada, K.; Hayamizu, T.; Inoue, Takeshi; Ishikawa, Tetsuya; Itoh, Masatoshi; Kawamura, H.; Kato, K.; Kato, Toyoaki; Uchiyama, A.; Furukawa, T.; Hatakeyama, A.; Hatanaka, K.; Murakami, T.; Nataraj, H. S.; Sato, Tomoya; Shimizu, Yasuhiro; Wakasa, T.; Yoshida, H. P.; Sakemi, Y.

doi:10.1063/1.4852218

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…The Fr ion is injected to the target, yttrium (Y) that has the work function smaller than the ionization potential of Fr. The injected Fr ion becomes a neutral atom and it will be desorbed from the target surface when the Y target is heated [9,10]. The MOT glass cell is attached to the neutralizer directly as shown in Fig.…”

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

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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

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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

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Francium: Tool for Fundamental Symmetry Investigations

Dammalapati¹,

Harada²,

Hayamizu³

et al. 2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

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Ultra-cold radioactive atomic isotopes produced using laser cooling and trapping methods have been in use for nuclear β-decay studies, atomic parity non conservation and for searches of a permanent electric dipole moment of a fundamental particle in atoms. Among atoms, francium, a radioactive heavy alkali atom has been identified as a promising candidate to search for an electron permanent electric dipole moment. In this context, a laser cooled francium factory is being setup at CYRIC, Tohoku University for the measurement of an electron EDM. We report on the status of the experiment and various stages of the facility such as production of francium isotopes, extraction and transportation of francium ions and conversion to atoms and finally laser cooling and trapping of francium atoms.

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Fundamental Physics with Cooled Radioactive Atoms

Sakemi

Harada

Itoh

et al. 2021

Proceedings of 10th International Conference on Nuclear Physics at Storage Rings (STORI’17)

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The electric dipole moment (EDM) for an elementary particle can be used to study physics beyond the Standard Model. A non-zero EDM leads to CP violation, which is important for understanding the mater-antimatter asymmetry in the Universe. In heavy paramagnetic atoms, due to relativistic effects, the electron EDM results in an atomic EDM that is enhanced by a factor K equal to the 3rd power of the nuclear charge. The heaviest alkali element francium (Fr) has the largest K value of about 895. At present, we are developing a high-intensity laser-cooled Fr factory at the Cyclotron and Radioisotope Center (CYRIC) at Tohoku University in an attempt to evaluate the EDM of Fr to an accuracy of 10 -29 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.

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Radioactive ion beam transportation for the fundamental symmetry study with laser-trapped atoms

Cited by 3 publications

References 12 publications

Fundamental physics with cold radioactive atoms

Fundamental physics with cold radioactive atoms

Francium: Tool for Fundamental Symmetry Investigations

Fundamental Physics with Cooled Radioactive Atoms

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