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Development of an intense oxygen-15 radioactive ion beam using low energy protons.

机译:使用低能质子开发强氧15放射性离子束。

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摘要

The Tri-University Meson Facility (TRIUMF) located in Vancouver, Canada has an extensive nuclear astrophysics program which aims to study rates of key nuclear reactions that take place in explosive stellar environments. Many of these experiments involve short-lived isotopes, therefore methods involving the use of radioactive ion beams (RIBS) must be employed.; At present there are several experiments at TRIUMF-ISAC which require high intensity 15O (half-life = 122.2 s) and 14O (half-life = 70 s) radioactive ion beams for the measurement of the rates of reactions such as 15O(alpha,gamma)19Ne and 14O(alpha,p)17F, respectively. The facility has been unable to produce a high intensity radioactive oxygen beam using a high-energy (500 MeV) proton beam and spallation techniques.; The goal of the work presented in this thesis is to explore alternative methods for the production of such oxygen beams at ISAC using low energy proton or deuteron beams.; A number of proof-of-principle radiochemical experiments were conducted making use of resources readily available. First the 14N(d,n) 15O reaction was investigated as a source of 15O to test the various transfer efficiencies of both 15O-labelled water and carbon monoxide, as well as conversion efficiencies of the radiolabelled water to carbon monoxide. Further experiments were conducted to produce 14O via the 14N(p,n)14O nuclear reaction. The results of the 14N(p,n)14O experiments can also be extrapolated in order to determine the projected RIB intensity that could be achieved using an enriched 15N gas target for the production of 15O via the 15N(p,n) reaction.
机译:位于加拿大温哥华的三大学介子设施(TRIUMF)拥有广泛的核天体物理学计划,旨在研究爆炸性恒星环境中发生的关键核反应的速率。这些实验中有许多涉及寿命短的同位素,因此必须采用涉及使用放射性离子束(RIBS)的方法。目前,在TRIUMF-ISAC上进行了几项实验,需要高强度的15O(半衰期= 122.2 s)和14O(半衰期= 70 s)放射性离子束来测量反应速率,例如15O(alpha, γ)19Ne和14O(alpha,p)17F。该设施无法使用高能(500 MeV)质子束和散裂技术产生高强度放射性氧束。本文提出的工作目标是探索使用低能质子或氘核束在ISAC上生产这种氧束的替代方法。利用可利用的资源进行了许多原理性放射化学实验。首先,研究了14N(d,n)15O反应作为15O的来源,以测试15O标记的水和一氧化碳的各种转移效率,以及放射性标记的水向一氧化碳的转化效率。进行了进一步的实验,以通过14N(p,n)14O核反应生产14O。 14N(p,n)14O实验的结果也可以外推,以确定通过使用15N(p,n)反应产生15O的富集15N气体靶可以达到的预计RIB强度。

著录项

  • 作者

    Lapi, Suzanne.;

  • 作者单位

    Simon Fraser University (Canada).;

  • 授予单位 Simon Fraser University (Canada).;
  • 学科 Physics Nuclear.; Chemistry Nuclear.
  • 学位 M.Sc.
  • 年度 2003
  • 页码 80 p.
  • 总页数 80
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;无机化学;
  • 关键词

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