Takao Kojima
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View article: Mass measurements of neutron-rich <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>A</mml:mi><mml:mo>≈</mml:mo><mml:mn>90</mml:mn></mml:mrow></mml:math> nuclei constrain element abundances
Mass measurements of neutron-rich nuclei constrain element abundances Open
Atomic masses of the neutron-rich isotopes 83,84Ga, 82–86Ge, 82–89As, 82,84–91Se, 85,86,89–92Br, 89,91,92Kr, and 91Rb have been measured with high precision and accuracy using the multi-reflection time-of-flight mass spectrograph at the RI…
View article: Development of Anticoincidence Detector Specializing in Small-Angle Compton Scattering Gamma Rays for Boron Neutron Capture Therapy
Development of Anticoincidence Detector Specializing in Small-Angle Compton Scattering Gamma Rays for Boron Neutron Capture Therapy Open
View article: Study of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>32</mml:mn></mml:mrow></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>34</mml:mn></mml:math> Shell Gap for Ti and V by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI
Study of the and Shell Gap for Ti and V by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI Open
The atomic masses of ^{55}Sc, ^{56,58}Ti, and ^{56-59}V have been determined using the high-precision multireflection time-of-flight technique. The radioisotopes have been produced at RIKEN's Radioactive Isotope Beam Factory (RIBF) and del…
View article: Development of Semiconductor Preamplifier with Radiation Hardness
Development of Semiconductor Preamplifier with Radiation Hardness Open
大線量放射線をモニターする放射線検出器の半導体プリアンプを開発している。半導体素子の大半は放射線に弱く，特に集積回路化された素子は100 Gy程度の照射しか堪えられないとされてきた。本研究では，放射線に強い接合型電界効果トランジスタ（J-FET）を用い，さらに放射線照射の影響を軽減するために回路的な工夫を加えた。この結果，100 kGy以上のγ線照射でも使用可能な半導体プリアンプとなった。
View article: Conceptual study on parasitic low-energy RI beam production with in-flight separator BigRIPS and the first stopping examination for high-energy RI beams in the parasitic gas cell
Conceptual study on parasitic low-energy RI beam production with in-flight separator BigRIPS and the first stopping examination for high-energy RI beams in the parasitic gas cell Open
An in-flight separator performs the important role of separating a single specific radioactive isotope (RI) beam from the thousands of RI beams produced by in-flight fission as well as projectile fragmentation. However, when looking at ``s…
View article: Development of intense gamma-ray source monitoring system in water for radiation safety
Development of intense gamma-ray source monitoring system in water for radiation safety Open
View article: Active discharging method for stable sub-micron sized beams of slow highly charged ions using tapered glass capillary with electrodes
Active discharging method for stable sub-micron sized beams of slow highly charged ions using tapered glass capillary with electrodes Open
Stable transmission of a 0.75 μm-sized Ar8+ beam of 10–100-keV energy through glass tandem optics was achieved. The optics consisted of a 4-electrode tapered capillary and a sub-μm-sized tapered capillary tip, arranged in series. To active…
View article: Optical trapping of nanoparticles on a silicon subwavelength grating and their detection by an ellipsometric technique
Optical trapping of nanoparticles on a silicon subwavelength grating and their detection by an ellipsometric technique Open
A method and setup are proposed for trapping and detecting nanoparticles dispersed in a nanocomposite solution using periodically localized light generated by a subwavelength transmission grating. By numerical simulations, it is shown that…
View article: Interaction of living cells with a high dose proton microbeam
Interaction of living cells with a high dose proton microbeam Open
We present current experiments studying the interaction of living cells to a high dose proton microbeam at the RIKEN capillary cell irradiation setup.