X-ray Spectrocopy of Kaonic Atoms
Kaonic 原子的 X 射线光谱
基本信息
- 批准号:05044038
- 负责人:
- 金额:$ 4.16万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for international Scientific Research
- 财政年份:1993
- 资助国家:日本
- 起止时间:1993 至 1994
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Strong interaction at low energy was studied by measuring X-rays of kaonic hydrogen atoms. The experiment was set up at the 12 GeV proton synchrotron of KEK.The importance of this experiment has long been recognized, and there were 3 previous trialsin late 70's and early 80's. However, due to experimental difficulties and due also to the small flux of kaon beam, nobody has succeeded in the observation of the kaonic hydrogen X-rays.In order to overcome difficulties, due to the large background caused by beam particles, and also to the small X-ray yields, we developed novel methods to suppress the X-ray background, and to enhance the signal to noise ratio.Namely, background was suppressedby i) measuring the reaction vertex, and by selecting the events originating from the hydrogen target, and ii) by applying event tagging to select events with 2 charged pions in the final state. We also developed a novel X-ray detector system consisting of 60 Si (Li) crystals, operating in a low-temperature hydrogen gas. The use of gas target, instead of liquid, should help improve signal to background ratio.In the first year, we concentrated on the detector development and construction. The Japanese group worked mostly on the hydrogen target, beam counters, Si (Li) detectors, and on the infrastructure in general. The Canadian team worked on the development and construction of the cylindrical vertex chambers and water Cherenkov detectors, both of which were essential in reducing the background. The completed detectors were transported to KEK,and were assembled there.In 1994, we started to debug the system using the kaon beam, and by the end of 1994 we started to take data. Preliminary analysis exhibited that we have succeeded in observing the kaonic hydrogen X-rays, although we need to collect higher statistics in order to draw final conclusions.
通过对K介子氢原子的X射线测量,研究了低能强相互作用。该实验是在KEK的12GeV质子同步加速器上进行的,其重要性早已得到公认,在70年代末和80年代初曾进行过3次实验。然而,由于实验上的困难和K介子束流的小通量,K介子氢X射线的观测一直没有成功,为了克服束粒子产生的大背景和X射线产额小的困难,我们发展了新的方法来抑制X射线背景,提高信噪比,即:通过i)测量反应顶点,并通过选择源自氢靶的事件,和ii)通过应用事件标记以选择在最终状态中具有2个带电π介子的事件,来抑制背景。我们还开发了一种新型的X射线探测器系统,由60 Si(Li)晶体组成,在低温氢气中工作。使用气体靶代替液体靶,有助于提高信号背景比。第一年,我们专注于探测器的开发和建设。日本小组主要从事氢靶、束流计数器、硅(锂)探测器和一般基础设施的工作。加拿大小组致力于开发和建造圆柱形顶点室和水切伦科夫探测器,这两个探测器对减少本底都至关重要。1994年,我们开始利用K介子束调试系统,并于1994年底开始采集数据。初步分析表明,我们已经成功地观察到K介子氢X射线,但我们需要收集更高的统计数据,以得出最终的结论。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
S.N.Nakamura: "Study of hadronic atoms" Thesis (Doctor of Science, University of Tokyo, 1995). (1995)
S.N.Nakamura:“强子原子研究”论文(东京大学理学博士,1995 年)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
M.Iwasaki et al.: "Kaonic Hydrogen X-ray Experiment at KEK" Nuclear Physics. (in press).
M.Iwasaki 等人:“KEK 的 Kaonic 氢 X 射线实验”核物理。
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- 影响因子:0
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HAYANO Ryugo其他文献
HAYANO Ryugo的其他文献
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{{ truncateString('HAYANO Ryugo', 18)}}的其他基金
Precision measurement of fundamental physical constants using exotic-atom spectroscopy
使用奇异原子光谱精确测量基本物理常数
- 批准号:
20002003 - 财政年份:2008
- 资助金额:
$ 4.16万 - 项目类别:
Grant-in-Aid for Specially Promoted Research
Spectroscopy of Antihydrogen
反氢光谱
- 批准号:
15002005 - 财政年份:2003
- 资助金额:
$ 4.16万 - 项目类别:
Grant-in-Aid for Specially Promoted Research
Study of eta and omega meson mass shift in nuclei using recoil-less reactions
利用无反冲反应研究原子核中的 eta 和 omega 介子质量转移
- 批准号:
11440073 - 财政年份:1999
- 资助金额:
$ 4.16万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Physics using ultra low-energy pulsed antiprotons
使用超低能量脉冲反质子的物理学
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09044061 - 财政年份:1997
- 资助金额:
$ 4.16万 - 项目类别:
Grant-in-Aid for international Scientific Research
Development of detectors for antiprotonic atom spectroscopy with pulsed antiproton beam
脉冲反质子束反质子原子光谱探测器的开发
- 批准号:
09554018 - 财政年份:1997
- 资助金额:
$ 4.16万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Study of deeply-bound pionic atoms
深度结合的π离子原子的研究
- 批准号:
09440100 - 财政年份:1997
- 资助金额:
$ 4.16万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Studies of Anomalously Long-Lived Hadronic Atoms
异常长寿强子原子的研究
- 批准号:
06044045 - 财政年份:1994
- 资助金额:
$ 4.16万 - 项目类别:
Grant-in-Aid for international Scientific Research
Experimental study of Deeply-bound Pionic Atoms
深层束缚π原子的实验研究
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02044032 - 财政年份:1990
- 资助金额:
$ 4.16万 - 项目类别:
Grant-in-Aid for international Scientific Research
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