hamon
Online ISSN : 1884-636X
Print ISSN : 1349-046X
ISSN-L : 1349-046X
Volume 31, Issue 3
Displaying 1-6 of 6 articles from this issue
  • Jun Sugiyama
    2021 Volume 31 Issue 3 Pages 107-112
    Published: August 10, 2021
    Released on J-STAGE: December 01, 2022
    JOURNAL FREE ACCESS

    Although a positive muon spin rotation and relaxation (μ+SR) technique is commonly used for materials science, its counterpart technique, μ-SR, has been less common due to its very limited availability and a very slow counting rate. However, a combination between an intense pulsed muon beam, such as, J-PARC and ISIS, and the development of a multi-channel counter system enables us to utilize μ-SR for studying a small nuclear magnetic field in solids. Here, we summarize the advantage and disadvantage of the two μSR techniques and propose μ±SR as a novel tool to identify diffusing species and clarify the ion diffusive nature in battery materials.

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  • Izumi Umegaki
    2021 Volume 31 Issue 3 Pages 113-116
    Published: August 10, 2021
    Released on J-STAGE: December 01, 2022
    JOURNAL FREE ACCESS

    We have used muons for an analysis of battery to improve its safety and performance in two ways; one is muon spin rotation and relaxation (μSR) with positive muons to study the diffusion of lithium (Li) in Li-ion battery materials. The dynamics of Li ion can be investigated through the response of muons to the internal magnetic field provided by the nuclear moment of the Li ion. The other is a non-destructive observation using negative muons. Since the muon-characteristic X-rays generated by negative muon irradiation have about 200 times higher energy than fluorescent X-rays, muonic X-rays from Li can penetrate from its housing. Recently, this technology has been successfully applied to the detection of metallic Li in a battery, and we hope that it will be further utilized for safety.

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  • Takahito Osawa
    2021 Volume 31 Issue 3 Pages 117-120
    Published: August 10, 2021
    Released on J-STAGE: December 01, 2022
    JOURNAL FREE ACCESS

    Muonic X-ray analysis is an elemental analysis method by detecting characteristic X-rays emitted from muonic atoms and has various advantages, for example, it can detect light elements such as carbon non-destructively. Our research group has been studying to apply this new analytical method to the sample of the asteroid Ryugu brought back by the asteroid explorer Hayabusa2. This paper outlines the research conducted at J-PARC muon facility so far and the preparation status of the experiment on Ryugu samples scheduled to be conducted from June to July 2021. To make this experiment successful, a device with a glove box has been developed that can analyze microsamples in a helium atmosphere, achieving very low background levels.

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  • Yasuhiro Inamura
    2021 Volume 31 Issue 3 Pages 121-127
    Published: August 10, 2021
    Released on J-STAGE: December 01, 2022
    JOURNAL FREE ACCESS

    In the Materials and Life science experimental Facility (MLF) of J-PARC, the computing group, named “Denno-han”, has been developed, managed and operated the MLF standard software and the computing infrastructures, which are widely covering the neutron event-recording data acquisition (DAQ) system, the device control software framework, data processing software and data management for neutron experimental instruments in MLF. In this article, I introduce the organization of MLF computing group and technical information of a series of MLF standard software as follows: DAQ middleware; IROHA2 instrument control; Manyo library and Utsusemi software. In addition, I report the policies on data management and the remote access from outside of J-PARC.

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  • Taro Nakajima, Daichi Kawana
    2021 Volume 31 Issue 3 Pages 128-131
    Published: August 10, 2021
    Released on J-STAGE: December 01, 2022
    JOURNAL FREE ACCESS

      Neutron scattering is one of the most powerful technique to probe structures and dynamics of matters in the momentum-energy (Q-E) space. However, it is not straightforward to calculate accessible Q-E regions from the specs of each instrument, in particular in the case of time-of-flight neutron scattering instruments with a pulsed neutron source. We have thus developed JavaScript-based web applications for the HRC instrument in BL12 of the Materials and Life science experimental Facility in J-PARC. These applications enable us to simulate neutron Laue diffraction patterns, relationships between resolution and flux, and accessible Q-E range for inelastic scattering experiments, which will improve usability of the HRC instrument.

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