Seiji Hosoya

National Institutes for Quantum and Radiological Science and Technology

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Kimikazu Sasa

University of Tsukuba

Tsutomu Takahashi

Japan Agency for Marine-Earth Science and Technology

Keisuke Sueki

University of Tsukuba

Tetsuya Matsunaka

Kanazawa University

Masumi Matsumura

University of Tsukuba

Hongtao Shen

Guangxi Normal University

Maki Honda

Japan Atomic Energy Agency

K. Takano

Iwate University

Y. Ochiai

Tokyo University of Science

Aya Sakaguchi

University of Tsukuba

Cooperative Institutions

University of Tsukuba

Guangxi Normal University

Japan Atomic Energy Agency

National Institutes for Quantum and Radiological Science and Technology

Takasaki Advanced Radiation Research Institute

Advanced Science Research Center

The University of Tokyo

Guangxi University

Chinese Academy of Sciences

China Institute of Atomic Energy

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Development of the fast determination method for Strontium-90 by accelerator mass spectrometry

Atomic Energy Society of Japan (2018)

Kimikazu Sasa Seiji Hosoya Maki Honda Tsutomu Takahashi Yukihiko Sato

Accelerator mass spectrometry

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Investigation of isobar separation methods and performance evaluation in accelerator mass spectrometry for high sensitive measurement of 10 Be and 36 Cl

Atomic Energy Society of Japan (2017)

Seiji Hosoya

Isobar

Accelerator mass spectrometry

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An ultra sensitive method for hard-to-measure nuclide 41 Ca by Accelerator Mass Spectrometry

Atomic Energy Society of Japan (2016)

Seiji Hosoya

Accelerator mass spectrometry

Nuclide

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Investigating ultralow-emittance nanobeam formation using a Coulomb crystal

Progress of Theoretical and Experimental Physics (2025)

Yosuke Yuri Nobumasa Miyawaki K. Hosaka Yasuyuki Ishii Seiji Hosoya

Abstract Ultraprecise single-ion irradiation is practically of interest for the application of research and development of quantum materials and devices. To achieve this, a single-ion irradiation system, consisting of a linear Paul trap (LPT) and electrostatic bipotential lenses, is being developed at Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology. In this paper, we conduct detailed multiparticle simulations on the controlled ejection of single ions from a two-component Coulomb crystal generated in the LPT, followed by the bipotential lens for strong focusing and acceleration of ejected cold ions, to investigate the feasibility of nanobeam formation. Two different schemes, which employ any of a string, planar, or shell crystal, are considered for selective single-ion ejection from the LPT. The present numerical results show that, in both ion ejection schemes, silicon ions sympathetically cooled through laser-cooled calcium ions can be ejected selectively from the LPT with an ultralow-emittance of the order of 10−15 m·rad or less and focused below 10 nm on the target after bipotential acceleration to 100 keV. The ion dynamics and focusing characteristics of the lens system are discussed.

Crystal (programming language)

10.1093/ptep/ptaf019

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Isobar suppression for 36Cl accelerator mass spectrometry at the University of Tsukuba

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2018)

Seiji Hosoya Kimikazu Sasa Tsutomu Takahashi Tetsuya Matsunaka Masumi Matsumura

Accelerator mass spectrometry

Isobar

Tandem accelerator

Isobaric process

Nuclide

10.1016/j.nimb.2018.07.001

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Citations (7)

Optimization of aΔE-Edetector for 41 Ca AMS

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2017)

Seiji Hosoya Kimikazu Sasa Tetsuya Matsunaka Tsutomu Takahashi Masumi Matsumura

Accelerator mass spectrometry

Pelletron

Nuclide

Tandem accelerator

10.1016/j.nimb.2017.03.161

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Citations (7)

The Site Investigation Of Low-Level Radioactive Waste For Sub-Surface Disposal Facility In Japan

AGUFM (2006)

Seiji Hosoya Takayuki Sasaki

High-level waste

waste disposal

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Radiocarbon dating of Chinese Ancient Tea Trees

Radiocarbon (2019)

Jia Chen Hongtao Shen Kimikazu Sasa Haihui Lan Tetsuya Matsunaka

ABSTRACT The jungles of Linyun and Longlin Autonomous Prefecture, located in the heart of the southwestern Guangxi Zhuang Autonomous Region of China, are home to the oldest tea trees ( Camellia sinensis ) in the world. In the absence of regular annual rings, radiocarbon ( 14 C) dating is one of the most powerful tools that can assist in the determination of the ages and growth rates of these plants. In this work, cores were extracted from large ancient tea trees in a central Longlin rain forest; extraction of carbon was performed with an automated sample preparation system. The 14 C levels in the tree cores were measured using accelerator mass spectrometry (AMS) at the University of Tsukuba. These measurements indicated that contrary to conventional views, the ages of trees in these forests range up to ~700 years, and the growth rate of this species is notably slow, exhibiting a long-term radial growth rate of 0.039±0.006 cm/yr. It was demonstrated that 14 C analyses provide accurate determination of ages and growth rates for subtropical wild tea trees.

Accelerator mass spectrometry

Annual growth %

Absolute dating

10.1017/rdc.2019.117

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Citations (5)

Radiocarbon measurement using a gas/solid hybrid ion source and an automated sample preparation system at the University of Tsukuba

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2019)

Tetsuya Matsunaka Kimikazu Sasa Seiji Hosoya Hongtao Shen Tsutomu Takahashi

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Accelerator mass spectrometry

Sample Preparation