Production of radioactive beams of francium

Stancari, G.; Veronesi, S.; Corradi, L.; Atutov, S. N.; Calabrese, R.; Dainelli, A.; Mariotti, E.; Moi, L.; Sanguinetti, S.; Tomassetti, L.

doi:10.1016/j.nima.2005.11.193

Cited by 16 publications

(7 citation statements)

References 22 publications

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“…The yield is drastically increased at 970 degree, which is around the melting point of the gold 1064 degree. This similar feature was also observed at other institutes such as SUNY [6] and LNL [7], and also we observed that the extraction time of the Fr ions became short when the thermal ionizer was operated at the temperature higher than the melting point. The stable production yield of 210 Fr with ~10 6 Fr + /sec was achieved successfully with the primary beam 18 O intensity of 200 nA.…”

Section: Resultssupporting

confidence: 89%

Search for a permanent EDM using laser cooled radioactive atom

Sakemi¹,

Harada²,

Hayamizu³

et al. 2011

J. Phys.: Conf. Ser.

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Abstract. An Electric Dipole Moment (EDM) of the elementary particle is a good prove to observe the phenomena beyond the Standard Model. A non-zero EDM shows the violation of the time reversal symmetry, and under the CPT invariance it means the CP violation. In paramagnetic atoms, an electron EDM results in an atomic EDM enhanced by the factor of the 3rd power of the charge of the nucleus due the relativistic effects. A heaviest alkali element francium (Fr), which is the radioactive atom, has the largest enhancement factor K ~ 895. Then, we are developing a high intensity laser cooled Fr factory at Cyclotron and Radioisotope Center (CYRIC), Tohoku University to perform the search for the EDM of Fr with the accuracy of 10 -29 e・cm. The important points to overcome the current accuracy limit of the EDM are to realize the high intensity Fr source and to reduce the systematic error due to the motional magnetic field and inhomogeneous applied field. To reduce the dominant component of the systematic errors mentioned above, we will confine the Fr atoms in the small region with the Magneto-Optical Trap and optical lattice using the laser cooling and trapping techniques. The construction of the experimental apparatus is making progress, and the new thermal ionizer already produces the Fr of ~10 6 ions/s with the primary beam intensity 200 nA. The developments of the laser system and optical equipments are in progress, and the present status and future plan of the experimental project is reported. IntroductionTo explore the mechanism responsible for the generation of observed matter-antimatter asymmetry in the Universe, the research on fundamental symmetry violations and various fundamental interactions using the laser cooled and trapped atoms is being promoted. The understanding of how the symmetry between the matter and antimatter was broken during the evolution of the early universe requires laboratory experiments which search for symmetry violations in the elementary particles such as quarks and leptons; one such phenomenon of our interest is the intrinsic electric dipole moment (EDM) of either elementary or composite systems. The non-zero observation of EDM provides the direct and conclusive signatures of the violation of time-reversal symmetry. The study of EDM also paves a way for the continuing quest for the ultimate theory of the Universe and it has a great potential in uncovering many mysteries which have been puzzling the mankind for ages such as the very survival of ourselves amidst many cosmic catastrophes such as a complete annihilation of matter and antimatter in the Universe. Using the extreme quantum states of matter at the low-energy scales we study the high-energy physics related to the phenomena which are thought to have happened in various epochs in the very early Universe.

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Section: Resultssupporting

confidence: 89%

Search for a permanent EDM using laser cooled radioactive atom

Sakemi¹,

Harada²,

Hayamizu³

et al. 2011

J. Phys.: Conf. Ser.

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“…Note also that our assignment is in fact consistent with pre-existing crossa e-mail: George.Dracoulis@anu.edu.au section measurements for the ( 16 O, xn) reactions (see, for example, refs. [6][7][8][9]). Some information on the still lighter range of isotopes, [205][206][207] Fr, has also recently been reported [10].…”

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confidence: 99%

Assignment of levels in 208Fr and 10- isomers in the odd-odd isotones 206At and 208Fr

et al. 2009

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Nuclei above the Z = 82 closed proton shell and below the N = 126 closed neutron shell provide an important region for testing shell model structures, defining residual interactions and probing possible transitions to non-spherical shapes. The francium isotopes (Z = 87) are known in some detail from the closed neutron shell at N = 126 down to the N = 124 isotope 211 Fr [1,2]. Information on the lighter isotopes, however, is more limited.

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“…Of these, few are short-lived, such as, 208 Fr (τ = 85.3 s) and 209 Fr (τ = 72.9 s), while others are long-lived, such as, 210 Fr (τ = 275.3 s) and 211 Fr (τ = 268.3 s) [13]. In addition, long-lived daughter isotopes of Fr [14] can be detected from both SSD and BPMs. Thus, the estimated lifetime from this measurement is the mixed lifetime of these isotopes.…”

Section: Lifetimes Of Fr Isotopesmentioning

confidence: 99%

Two-dimensional beam profile monitor for the detection of alpha-emitting radioactive isotope beam

Tanaka,

Dammalapati,

Harada

et al. 2021

Preprint

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Ions with similar charge-to-mass ratios cannot be separated from existing beam profile monitors (BPMs) in nuclear facilities in which low-energy radioactive ions are produced due to nuclear fusion reactions. In this study, we developed a BPM using a microchannel plate and a charge-coupled device to differentiate the beam profiles of alpha-decaying radioactive isotopes from other ions (reaction products) produced in a nuclear reaction. This BPM was employed to optimize the low-energy radioactive francium ion (Fr + ) beam developed at the Cyclotron and Radioisotope Center (CYRIC), Tohoku University, for electron permanent electric dipole moment (e-EDM) search experiments using Fr atoms. We demonstrated the performance of the BPM by separating the Fr + beam from other reaction products produced during the nuclear fusion reaction of an oxygen ( 18 O) beam and gold ( 197 Au) target. However, as the mass of Au is close to that of Fr, separating the ions of these elements using a mass filter is a challenge, and a dominant number of Au + renders the Fr + beam profile invisible when using a typical BPM. Therefore, by employing the new BPM, we could successfully observe the Fr + beam and other ion beams distinctly by measuring the alpha decay of Fr isotopes. This novel technique to monitor the alpha-emitting radioactive beam covers a broad range of lifetimes, for example, from approximately 1 s to 10 min, and can be implemented for other alpha-emitter beams utilized for medical applications.

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Production of radioactive beams of francium

Cited by 16 publications

References 22 publications

Search for a permanent EDM using laser cooled radioactive atom

Search for a permanent EDM using laser cooled radioactive atom

Assignment of levels in 208Fr and 10- isomers in the odd-odd isotones 206At and 208Fr

Two-dimensional beam profile monitor for the detection of alpha-emitting radioactive isotope beam

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