Y. Sakemi
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View article: Conception, modelling, and characterization of a fiber amplifier with a simple and easy-to-repair configuration intended for the use in harsh environments
Conception, modelling, and characterization of a fiber amplifier with a simple and easy-to-repair configuration intended for the use in harsh environments Open
We have developed a Yb-doped fiber amplifier (YDFA) using fusion splicing, and characterized its performance with numerical simulation, achieving a continuous output of above $10~{\mathrm{W}}$ of $1064~{\mathrm{nm}}$ light. The devic…
View article: Measurement of the charge-to-mass ratio of particles trapped by the Paul trap for education
Measurement of the charge-to-mass ratio of particles trapped by the Paul trap for education Open
Paul traps are devices that confine particles using an alternating electric field and have been used in undergraduate experimental classes at universities. Owing to the requirement of a high voltage ($> 10^3$ V), Paul traps are not used in…
View article: Experimental study of (<i>p</i>, 2<i>p</i>) reactions at 197 MeV on 12C, 16O, 40,48Ca, and 90Zr nuclei leading to low-lying states of residual nuclei
Experimental study of (<i>p</i>, 2<i>p</i>) reactions at 197 MeV on 12C, 16O, 40,48Ca, and 90Zr nuclei leading to low-lying states of residual nuclei Open
We have measured the differential cross section and analyzing power for (p, 2p) reactions that lead to discrete states of residual nuclei at an incident energy of 197 MeV for five kinds of target nuclei, 12C, 16O, 40,48Ca, and 90Zr. The da…
View article: An accelerator experiment for junior and senior high school students to improve students’ involvement in fundamental physics
An accelerator experiment for junior and senior high school students to improve students’ involvement in fundamental physics Open
In Japan, research activities by junior and senior high school students show an upward trend. However, there are limited examples of research activities in the field of elementary particles and atoms. This is due to the difficulty associat…
View article: Development of a Laser Frequency Stabilization and an Optical Transmission System for the Francium Electric Dipole Moment Search
Development of a Laser Frequency Stabilization and an Optical Transmission System for the Francium Electric Dipole Moment Search Open
We developed a laser frequency stabilization and an optical fiber transmission system for the the francium electric dipole moment search. The absolute accuracy of a laser frequency stabilization scheme using a state-of-the-art commercial w…
View article: Quantum sensing of the electron electric dipole moment using ultracold entangled Fr atoms
Quantum sensing of the electron electric dipole moment using ultracold entangled Fr atoms Open
We propose a method to measure the electron electric dipole moment (eEDM) using ultracold entangled francium (Fr) atoms trapped in an optical lattice, yielding an uncertainty below the standard quantum limit. Among the alkali atoms, Fr off…
View article: Towards CP Violation Studies on Superheavy Molecules: Theoretical and Experimental Perspective
Towards CP Violation Studies on Superheavy Molecules: Theoretical and Experimental Perspective Open
Molecules containing superheavy atoms can be artificially created to serve as sensitive probes for study of symmetry-violating phenomena. Here, we provide a detailed theoretical study for diatomic molecules containing the superheavy lawren…
View article: Systematic studies of rubidium-exposed surfaces by X-ray photoelectron spectroscopy and light-induced atom desorption
Systematic studies of rubidium-exposed surfaces by X-ray photoelectron spectroscopy and light-induced atom desorption Open
We systematically investigated various types of surfaces on which rubidium (Rb) atoms were deposited by X-ray photoelectron spectroscopy (XPS) and measured the light-induced atom desorption (LIAD) from those surfaces. The main surfaces of …
View article: Fundamental physics with cold radioactive atoms
Fundamental physics with cold radioactive atoms Open
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 u…
View article: Experimental study of (<i>p</i>, 2<i>p</i>) reactions at 392 MeV on 12C, 16O, 40Ca and 208Pb nuclei leading to low-lying states of residual nuclei
Experimental study of (<i>p</i>, 2<i>p</i>) reactions at 392 MeV on 12C, 16O, 40Ca and 208Pb nuclei leading to low-lying states of residual nuclei Open
We have measured the differential cross-sections and analyzing powers for ($p,2p$) reactions at an incident energy of 392 MeV on $^{12}$C, $^{16}$O, $^{40}$Ca, and $^{208}$Pb nuclei, leading to discrete states of the residual nuclei. The d…
View article: Analysis of an Optical Lattice Methodology for Detection of Atomic Parity Nonconservation
Analysis of an Optical Lattice Methodology for Detection of Atomic Parity Nonconservation Open
We present an extension and a deepened analysis of a suggested experimental scheme for detecting atomic parity violation, previously published in Phys. Rev. A 2019, 100, 050101. The experimental concept is described in more detail and we c…
View article: Optical-lattice-based method for precise measurements of atomic parity violation
Optical-lattice-based method for precise measurements of atomic parity violation Open
We propose a method for measuring parity violation in neutral atoms. It is an\nadaptation of a seminal work by Fortson [Phys. Rev. Lett. {\\bf 70}, 2383\n(1993)], proposing a scheme for a single trapped ion. In our version, a large\nsample…
View article: Thermal surface neutralization of Fr ions with metal foils for magneto-optical trapping of radioisotopes
Thermal surface neutralization of Fr ions with metal foils for magneto-optical trapping of radioisotopes Open
We investigate neutralization processes (especially thermal surface neutralization), which are required for the magneto-optical trapping of radioactive atoms. A variety of neutralization methods are first summarized: neutral beam injection…
View article: Alkali ion-to-neutral atom converter for the magneto-optical trap of a radioactive isotope
Alkali ion-to-neutral atom converter for the magneto-optical trap of a radioactive isotope Open
We have developed a unique neutralizer device that uses an yttrium target surrounded by a platinum wall to magneto-optically trap radioactive atoms. In general, the radioactive nucleus produced in a nuclear reaction is extracted and transp…
View article: Development of a Dual Isotope Co-Magnetometer Using Laser Cooled Rubidium Toward Electron Electric Dipole Moment Measurement Using Francium
Development of a Dual Isotope Co-Magnetometer Using Laser Cooled Rubidium Toward Electron Electric Dipole Moment Measurement Using Francium Open
We have developed a dual-rubidium-isotope magneto-optical tap (MOT) for a dual species co-magnetometer used in measurements of the electron electric dipole moment (EDM) using laser-cooled francium atoms. The EDM measurement using atoms in …
View article: Current status of plasma spectroscopic experiments with Hyper-ECR ion source at CNS, University of Tokyo
Current status of plasma spectroscopic experiments with Hyper-ECR ion source at CNS, University of Tokyo Open
During operations of the Hyper-ECR ion source at the Center for Nuclear Study, University of Tokyo, an observation of plasma light intensities by a monochromator was made. Various gaseous and metal ions are produced, then extracted, and in…
View article: Two-dimensional Beam Profile Monitor for Alpha Emitter
Two-dimensional Beam Profile Monitor for Alpha Emitter Open
We developed two-dimensional beam profile monitors for alpha-emitters along with other larger number of ions to measure the permanent electric dipole moment of the electron using francium atoms at CYRIC in Tohoku university. Francium is pr…
View article: Effective multiple sideband generation using an electro-optic modulator for a multiple isotope magneto-optical trap
Effective multiple sideband generation using an electro-optic modulator for a multiple isotope magneto-optical trap Open
Herein, we report an effective method for the generation of radio-frequency (RF) sidebands in an electro-optic modulator for the simultaneous magneto-optical trapping of two isotopes. This is achieved by switching the RF signals alternatel…
View article: Frequency Measurement of Tellurium Lines Near Calcium
Frequency Measurement of Tellurium Lines Near Calcium Open
We report measurement of frequencies of tellurium lines with respect to atomic calcium employing a 423 nm commercial violet laser diode placed in an extended cavity. Doppler-free saturated absorption spectroscopy of molecular tellurium is …
View article: Measurement of the 3-α decay from the Hoyle and the broad 10 MeV states in<sup>12</sup>C
Measurement of the 3-α decay from the Hoyle and the broad 10 MeV states in<sup>12</sup>C Open
The measurements of the 3-α decay from the Hoyle and the broad 10 MeV state in12C have been performed using an inverse kinematic method of the12C(12C,3α)12C reaction at E12C = 110 MeV. In the measurement of the Hoyle state, the upper limit…
View article: Magic and tune-out wavelengths for atomic francium
Magic and tune-out wavelengths for atomic francium Open
The frequency dependent polarizabilities of the francium atom are calculated from the available data of energy levels and transition rates. Magic wavelengths for the state insensitive optical dipole trapping are identified from the calcula…
View article: Development of a Magneto-Optical Trap System of Francium Atoms for the Electron Electric-Dipole-Moment Search
Development of a Magneto-Optical Trap System of Francium Atoms for the Electron Electric-Dipole-Moment Search Open
The finite value of an electron electric dipole moment (eEDM) provides the direct evidence for the violation of time reversal symmetry. Fr atoms, whose enhancement factor is 895, trapped by laser cooling and trapping techniques are one of …
View article: Development of Neutron Polarization Measurement System for Studying <i>NN</i> interaction in Nuclear Medium
Development of Neutron Polarization Measurement System for Studying <i>NN</i> interaction in Nuclear Medium Open
We have developed the neutron polarization measurement system to perform the first polarization-transfer measurement for the exclusive [Formula: see text] reaction. For the neutron polarization measurement, we have reconstructed the neutro…