低圧の混合ガス試料(H<sub>2</sub>+CO, H<sub>2</sub>+CO<sub>2</sub>)中でのミュオン転移における化学効果 Chemical Environmental Effects on Muon Transfer Process in Low Pressure Mixture Gases; H<sub>2</sub>+CO and H<sub>2</sub>+CO<sub>2</sub>

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Abstract

陽子と負ミュオンからなるミュオン水素原子は,核電荷がキャンセルされた中性の粒子のように振る舞い,他の原子の原子核近傍まで接近し,ミュオン転移過程と呼ばれるミュオンの移動反応を起こす。今回,我々はCOとCO<sub>2</sub>の2つの化合物に対しミュオン転移過程の観察を行い,ミュオン特性X線の測定からミュオン原子形成過程の化合物による変化を調べた。今回の実験条件では化合物による転移過程の違いについて,統計的に有意な差は見いだせなかったが,転移によるミュオンの捕獲比など,捕獲されたミュオンの初期状態について詳細なテータを得ることができた。

A muonic hydrogen atom, which consists of a negative muon and a proton, behaves as an electrically neutral particle. As such, it can approach another nucleus without Coulomb repulsion, allowing the muon to be directly transferred to inner muon levels of the nucleus and form a muonic atom. We studied muonic atom formation via this muon transfer process in two chemical environments; CO and CO<sub>2</sub> (CO has one oxygen atom and one triple bond, and CO<sub>2</sub> has two oxygen and two double bond), to examine the effects of the environments on muonic atom formation. The muon capture probability and intensity pattern of muonic Xrays for carbon and oxygen atoms were determined through measurement of muonic Xrays emitted after muonic atom formation. By comparing the results of CO and CO<sub>2</sub> to each other, we found that the muon capture probabilities and initial muon quantum levels for carbon and oxygen atoms resulting from the muon transfer process do not depend on the chemical environment, though a significant effect of the chemical environmental was observed for the direct muon capture process. The effect of the chemical environmental in muonic atom formation via the muon transfer process is too small to detect statistically significant in our experimental system.

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 65(3), 113-118, 2016

    Japan Radioisotope Association

Codes

  • NII Article ID (NAID)
    130005137586
  • NII NACSIS-CAT ID (NCID)
    AN00351589
  • Text Lang
    ENG
  • ISSN
    0033-8303
  • NDL Article ID
    027206154
  • NDL Call No.
    Z15-20
  • Data Source
    NDL  J-STAGE 
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