Liquid Ar Ionization Chamber for Isotope Identification of heavy ions with the energy of 100 MeV/n

用于能量 100 MeV/n 重离子同位素识别的液体氩电离室

基本信息

  • 批准号:
    06554005
  • 负责人:
  • 金额:
    $ 3.14万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
  • 财政年份:
    1994
  • 资助国家:
    日本
  • 起止时间:
    1994 至 1995
  • 项目状态:
    已结题

项目摘要

Until recently, it has been considered that liquid Ar is not suitable as detector medium of ionization chamber for heavy ions because high density of electron-ion pairs were produced along a heavy ion track and a considerable fraction of the electron-ion pairs recombines even if some electric field is applied. In the recombination, however, many vacuum ultra violet (VUV) photons are produced. therefore, if liquid Ar includes a small amount of organic molecules which have high photo-ionization cross section, the emitted VUV photons are absorbed by the molecules and new electron-ion pairs are produced by photo-ionization effect of the excited molecules. As a result, the electron collection yield in liquid Ar ionization chamber increases even for heavy ions. From this view-point, the response of a small allene doped liquid Ar ionization chamber were measured for O,Al and Xe of the energy of 23-34 MeV/n. The result shows that the energy resolutions for O and Al ions are better than 1% but … More that for Xe ions is 1.7%. The latter value is considered to be caused by the energy loss fluctuation in passing of Xe ions through the window material. On the basis of this experiment, we have been constructed an allene doped liquid Ar gridded ionization chamber with a sensitive volume of 4.8cm * 4.8cm * 4.0cm and its performances were investigated for O,Ne, Ar and Ca ions with the energy of -100 MeV/n. The results are described by classifying into three following parts.i) Ar and Ca ions :As expected, the energy resolution of 0.5% (FWHM) was obtained for Ar and Ca ions. The energy resolution deteriorates with increase in counting rate but it is small compared with that for O and Ne ions which will be described later. For Ar and Ca ions, the 0.5% resolution is kept until about 100 counts per second.ii) O and Ne ions :The best energy resolution for these ions was 1% (FWHM) and its counting rate dependency was much larger than that for O and Ne ions. To realize the energy resolution of 1%, the counting rate should be less than 10 counts per second. This counting rate dependence can be explained by reduction of the effective electric field due to space charge effect of positive ions remained in the sensitive region.iii) Bragg Curve Spectrometry for O and Ne ions :The wave shape of an anode signal obtained by the amplification system with a small differntial time constant should give a Bragg Curve for an incident ion. In fact, we could obtain such wave shapes for O and Ne ions when the counting rate is less than 10 counts per sec. It was experimentally shown that the identification of element or isotope of ions is possible for O and Ne ions. Less
直到最近,人们一直认为液体Ar不适合作为重离子电离室的探测介质,因为即使在外加电场的情况下,沿着重离子轨迹产生高密度的电子-离子对,并且相当一部分电子-离子对发生复合。然而,在复合过程中,会产生许多真空紫外线(VUV)光子。因此,如果液态Ar中含有少量具有高光离截面的有机分子,发射的VUV光子会被分子吸收,激发分子的光离效应会产生新的电子-离子对。结果表明,即使对于重离子,液体Ar电离室中的电子收集产额也会增加。从这一角度出发,测量了一个小型掺烯液态Ar电离室对能量为23-34 MeV/n的O、Al、Xe的响应,结果表明,除…外,O、Al离子的能量分辨率均优于1%更多的是Xe离子的1.7%。后者被认为是由于Xe离子通过窗口材料时的能量损失起伏引起的。在此基础上,我们搭建了灵敏体积为4.8 cm*4.8 cm*4.0 cm的掺烯液态Ar格栅电离室,并对能量为-100 MeV/n的O、Ne、Ar和Ca离子进行了研究,结果分为三个部分:i)Ar和Ca离子:如预期的那样,对Ar和Ca离子的能量分辨率为0.5%(FWHM)。能量分辨率随计数率的增加而降低,但与O离子和Ne离子的能量分辨率相比要小,后面将对其进行描述。对于Ar和Ca离子,0.5%的分辨率保持到大约每秒100次。ii)O和Ne离子:这些离子的最佳能量分辨率为1%(FWHM),其对计数率的依赖性远远大于O和Ne离子。要实现1%的能量分辨率,计数速率应小于10次/秒。这种计数速率依赖关系可以用保留在敏感区的正离子的空间电荷效应引起的有效电场的降低来解释。iii)O和Ne离子的布拉格曲线光谱:由放大系统获得的具有小的微分时间常数的阳极信号的波形应该给出入射离子的布拉格曲线。事实上,当计数速率小于10次/秒时,我们就可以得到O离子和Ne离子的这种波形。实验表明,对O、Ne离子进行元素或同位素鉴定是可能的。较少

项目成果

期刊论文数量(12)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A.Hitachi, T.Doke, et al.: "Energy resolution of allene doped liquid argon detectors for ions of energy 23-34 MeV/n" Nucl.Instr. & Meth.A340. 540-550 (1994)
A.Hitachi、T.Doke 等人:“能量分辨率为 23-34 MeV/n 的离子的丙二烯掺杂液氩探测器”Nucl.Instr。
  • DOI:
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  • 影响因子:
    0
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  • 通讯作者:
A. Hitachi, H. Ichinose, J. Kikuchi, T. Doke, K. Masuda and E. Shibamura: "Photoionization quantum yields of organic molecules in liquid argon and xenon" Phis. Rev. B. 55. 5742-5748 (1997)
A. Hitachi、H. Ichinose、J. Kikuchi、T. Doke、K. Masuda 和 E. Shibamura:“液态氩和氙中有机分子的光电离量子产率”Phis。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
A. Hitach, J. A. La Verne, J. J. Kolata and T. Doke: "Energy resolution of allene doped liquid argon detectors for ions of energy 23-34 MeV/n" Nucl. Instr. & Meth.A340. 540-550 (1994)
A. Hitach、J. A. La Verne、J. J. Kolata 和 T. Doke:“能量分辨率为 23-34 MeV/n 离子的丙二烯掺杂液氩探测器”Nucl。
  • DOI:
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  • 影响因子:
    0
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  • 通讯作者:
A. Yunoki, T. Doke, et al.: "Allene doped liquid argon chamber for heavy ions with the energy of 〜100 MeV/n : II O and Ne ions" Nucl. Instr. & Meth.(submitted).
A. Yunoki、T. Doke 等人:“用于能量约为 100 MeV/n 的重离子的丙二烯掺杂液氩室:II O 和 Ne 离子”Nucl。
  • DOI:
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  • 期刊:
  • 影响因子:
    0
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  • 通讯作者:
M.Satoh, T.Doke, et al.: "Attenuation length of drifting electrons in allene-doped liquid argon." Nucl.Instr. & Meth.A348. 435-438 (1997)
M.Satoh、T.Doke 等人:“掺杂丙二烯的液氩中漂移电子的衰减长度。”
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DOKE Tadayoshi其他文献

DOKE Tadayoshi的其他文献

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{{ truncateString('DOKE Tadayoshi', 18)}}的其他基金

Development of automatic system for precise analysis of massive data in glass track detectors
玻璃轨道探测器海量数据精准分析自动化系统开发
  • 批准号:
    14350042
  • 财政年份:
    2002
  • 资助金额:
    $ 3.14万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
"SEARCH FOR NEW NEUTRON RICH NUCLEI BY USING ALLENE-DOPED-LIQUlD ARGON CALORIMETER"
“使用丙二烯掺杂液氩热量计寻找新的富中子核”
  • 批准号:
    06640413
  • 财政年份:
    1994
  • 资助金额:
    $ 3.14万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Liquid Xe Homogeneous Shower Calorimeter with Excellent Energy Resolution in the GeV Region
液态 Xe 均质簇射热量计,在 GeV 区域具有出色的能量分辨率
  • 批准号:
    03554005
  • 财政年份:
    1991
  • 资助金额:
    $ 3.14万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
Construction of 3.3 Ktons Liquid Argon Time Projection Chamber
3.3吨液氩时间投影室建造
  • 批准号:
    63044138
  • 财政年份:
    1988
  • 资助金额:
    $ 3.14万
  • 项目类别:
    Grant-in-Aid for international Scientific Research
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