Development of neutron in-beam Mossbauer spectroscopy

中子束内穆斯堡尔谱的发展

• 批准号: 15550057
• 负责人: SAKAI Yoichi
• 金额: $ 2.43万
• 依托单位: Daido Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15550057/
• 关键词: highly excited state; solid-phase hot-atom chemistry; ^<56>Fe(n,γ)^<57>Fe reaction; non-destructive analysis; reactor neutron-beam; in-beam Mossbauer spectroscopy; parallel mate avalanche counter; iron disulfide; キャラクタリゼーション; 高励起状態化学種; in situ観察

A number of researches have been so far reported on the chemical effects of nuclear transformations, i.e., hot-atom chemistry abbreviated by HAC. Hot atoms are in highly excited states because of nuclear recoil. It is a research goal of solid-phase HAC to make clear as to what happens in solid immediately after the nuclear event. However, it has been expected that the distribution of radiochemical products measured in conventional solid-phaseHAC should be seriously affected in solid during dissolution and chemical analysis. By emission Mossbauer spectroscopy we could obtain information non-destructively on the chemical effects associated with a nuclear decay of Mossbauer transition. If the emission Mossbauer spectrum is measured for the source system fed through a nuclear reaction, that is, in an in-beam Mossbauer spectroscopic work, the chemical effects of the combination of the nuclear reaction and the subsequent prompt decays to Mossbauerr level should appear in the spectrum. The co … More ntribution to HAC effects is assumed to be much greater from the nuclear reaction than from the following Mossbauer decay because of their recoil energies.In the present project, we did the neutron in-beam ^<57>Fe Mossbauer spectroscopic investigations for iron compounds such as iron sulfide, allowing us to obtain non-destructively the information with the time scale of 100 ns, which much shorter than that in the conventional HAC techniques. Our research attention and interest were paid to the chemical effects associated with the ^<56>Fe(n, γ)^<57>Fe reaction, such as chemical-bond rupture and change of iron oxidation-state as the hot-atom effects. Another important aim of our study was to establish the in-beam Mossbauer spectroscopy in neutron facilities, by which we present the experimental results on the chemical behaviors of neutron-induced hot-atoms in solid. Mossbauer measurements were carried out using a parallel plate avalanche counter (PPAC) at the prompt γ-ray analysis setup at the neutron beam hall of the JRR-3M reactor of Japan Atomic Energy Research Institute. The PPACs were fabricated and improved in the present work. The in-beam emission Mossbauer spectrum of pyrite showed two doublets. One component corresponding to pyrite occupied 1/3 of the total peak area, and the other major component was tentatively assumed as Fe^<3+> at the interstitial site of pyrite. The emission spectrum of marcasite was also composed of two doublets : one corresponding to marcasite, and the other doublet. In both iron disulfides, it was revealed that recoil of the cascade γ-ray emission promptly after the neutron capture reaction produced one new species distinguishable from the original target compound by in-beam ^<57>Fe Mossbauer spectroscopy. Less

迄今为止，已经报道了许多关于核转变的化学效应的研究，即，热原子化学简称HAC由于核反冲，热原子处于高度激发状态。固相HAC的一个研究目标是弄清楚核事件发生后固体中发生了什么。然而，人们已经预料到，在常规固相HAC中测量的放射化学产物在固体中的分布在溶解和化学分析过程中会受到严重影响。通过发射穆斯堡尔谱，我们可以非破坏性地获得与穆斯堡尔跃迁的核衰变有关的化学效应的信息。如果发射穆斯堡尔谱是对通过核反应馈送的源系统测量的，即在束内穆斯堡尔谱工作中，核反应和随后的穆斯堡尔能级的瞬发衰变的组合的化学效应应该出现在谱中。的co ...更多信息 在本项目中，我们<57>对铁化合物（如硫化铁）进行了中子束中~（16）Fe穆斯堡尔谱研究，使我们能够在100 ns的时间尺度上无损地获得信息，这比传统的HAC技术要短得多。我们的研究重点和兴趣是与^<56>Fe（n，γ）^<57>Fe反应有关的化学效应，如化学键断裂和铁氧化态的变化等热原子效应。本研究的另一个重要目的是建立在中子装置上的在束穆斯堡尔谱，并利用该谱研究固体中中子感生热原子的化学行为。在日本原子能研究所JRR-3 M反应堆中子束大厅的瞬发γ射线分析装置上，用平行板雪崩计数器（PPAC）进行了穆斯堡尔谱测量。本工作制备并改进了PPAC。黄铁矿的在束发射穆斯堡尔谱显示为两条双峰。其中一种组分对应于黄铁矿，占总峰面积的1/3，另一种主要组分初步假定为位于黄铁矿间隙位的Fe^&lt;3+&gt;。白铁矿的发射光谱也由两个双峰组成：一个对应于白铁矿，另一个双峰。在这两种二硫化铁中，中子俘获反应后级联γ射线发射的反冲立即产生了一种新的物种，通过束内^ Fe穆斯堡尔谱可以与原始目标化合物区分<57>开来。少

项目成果

Development of in-Beam Neutron Mossbauer Spectroscopy

束内中子穆斯堡尔能谱的发展

• 发表时间: 2004
• 期刊: KURRI-KR 160
• 作者: M.K.Kubo;Y.Kobayashi;W.Sato;Y.Yamada;T.Saito;Y.Nemoto;Y.Sakai;H.Shoji;C.Yonezawa;H.Matsue;M.Nakada
• 通讯作者: M.Nakada

Reactions of ^<57>Mn implanted in solid oxygen

^<57>Mn注入固体氧中的反应

• 发表时间: 2004
• 期刊: RIKEN Accel.Prog.Rep. 37
• 作者: Y.Yamada;Y.Kobayashi;H.Ueno;K.M.Kubo;H.Watanabe;A.Yoshimi;H.Miyoshi;D.Kameda;K.Asahi
• 通讯作者: K.Asahi

Neutron in-beam Mossbauer spectroscopy with a parallel plate avalanche counter

使用平行板雪崩计数器的中子束内穆斯堡尔谱

• 发表时间: 2005
• 期刊: Industrial Applications of the Mossbauer Effect, American Institute of Physics, Conference Proceedings 765
• 作者: M.K.Kubo;Y.Kobayashi;Y.Yamada;Y.Nemoto;T.Saito;Y.Sakai;H.Shoji;C.Yonezawa;H.Matsue;M.Nakada
• 通讯作者: M.Nakada

Application of Doppler broadening of neutron-Induced prompt γ-rays to analytical sciences

中子诱发瞬发γ射线的多普勒展宽在分析科学中的应用

• 发表时间: 2004
• 期刊: Bunseki 2004-1
• 作者: Y.Yamada;Y.Kobayashi;H.Ueno;K.M.Kubo;H.Watanabe;A.Yoshimi;H.Miyoshi;D.Kameda;K.Asahi;Y.Sakai
• 通讯作者: Y.Sakai

久保謙哉, 酒井陽一 他8名: "中性子インビームメスバウアー分光法の開発"日本放射化学会誌別冊. 4巻. 77-77 (2003)

Kenya Kubo、Yoichi Sakai 等 8 人：“中子束内穆斯堡尔光谱的发展”，日本放射化学学会杂志，第 4 卷，77-77（2003 年）。