STUDY OF A HIGH RESOLUTION GERMANIUM ION CHAMBER FOR DOUBLE beta DECAYS

双β衰变高分辨率锗离子室的研究

• 批准号: 02452018
• 负责人: YUTA Haruo
• 金额: $ 3.52万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452018/
• 关键词: Elementary Particle; beta-decay; Particle Detector; Neutrino; electron; Ion Chamber; Calorimeter; ベ-タ-崩壊; ニュ-トリノ; イオン・チェンバ-; カロリメ-タ-

For the purpose of studying double beta decays, we have investigated possibility of constructing a high resolution (energy) warm liquid ionization chamber which contains Tetramethyl germanium (TMG). TMG contains 7.6% of possible double beta decay source of ^<76>Ge. Thus, if the high resolution ionization chamber filled with TMG is constructed, then the chamber will be a good detector for observing the neutrinoless double beta decays. However, high resolution in energy is essential for the observation.For this purpose, we first constructed a purification system for TMG and an ionization chamber with two parallel plates and succeeded in observing a signal from 976KeV conversion electrons from ^<207>Bi. Then, we made a new chamber with a grid between the cathode and the anode and compared the energy resolutions for (1) without using the grid and (2) with using the grid. The results were : sigma/E-19% for (1) and 17% for (2) for the liquid with electron lifetime of 4musec, indicating some improvement in the energy resolution. However, the further improvement in the energy resolution can be expected for the liquid with a longer lifetime.

为了研究双β衰变，我们研究了建立一个高分辨（能量）四甲基锗（TMG）温液电离室的可能性。TMG含有7.6%的^ Ge双β衰变源<76>。因此，如果建造一个充满TMG的高分辨电离室，它将是一个很好的无中微子双β衰变探测器。为此，我们首先建立了TMG的净化系统和两平行板电离室，并成功地观测到了976 KeV的^ Bi转换电子信号<207>。然后，我们制作了一个在阴极和阳极之间带有栅格的新腔室，并比较了（1）不使用栅格和（2）使用栅格的能量分辨率。结果是：对于电子寿命为4 μ sec的液体，σ/E-对于（1）为19%，对于（2）为17%，表明能量分辨率有所改善。然而，对于具有较长寿命的液体，可以预期能量分辨率的进一步改善。

项目成果

H.Yuta,K.Abe,K.Hasegawa et al: "Signal obserbation from a pulsed Ionization chamber Filled with Tetramethyl Germanium" JAPP Letters. 30. 525-527 (1991)

H.Yuta、K.Abe、K.Hasekawa 等人：“来自充满四甲基锗的脉冲电离室的信号观测”JAPP Letters。

T.Kitagaki,H.Yuta etal,: "study of νd→μ^-PPs and νd→μ^-△^<++>(1232)n_s using the BNL 7ーfoot deuteriumーfilled bubble chamber" Physical Review D. 42. 1331-1338 (1990)

T.Kitagaki、H.Yuta 等人：“使用 BNL 7 英尺充满氘的气泡室研究 νd→μ^-PPs 和 νd→μ^-△^<++>(1232)n_s” 物理评论 D 42. 1331-1338 (1990)

B.Aubert、湯田 他20名: "Componsation studies of a Lead/TMP Calorimeter" Nuclear Instrument and Method. A313. 357-366 (1992)

B.Aubert、Yuda 和其他 20 人：“铅/TMP 热量计的成分研究”核仪器和方法，357-366 (1992)。

D.Aston,阿部,長谷川,末包,湯田,他38名: "Production of 400 Mirrors with High VUV Reflectivity for Use in the SLD Cerenkov Ring Imaging Detector" Nuclear Instrument and Method. A300. 501-510 (1991)

D.Aston、Abe、Hasekawa、Sueba、Yuda 和其他 38 人：“用于 SLD Cerenkov 环形成像探测器的 400 个高 VUV 反射镜的生产”核仪器和方法 (1991)。

湯田,阿部,長谷川,末包,増田,他7名: "Signal Observation from a pulsed Ionization Chamber Filled with Tetramethyl Germanicum" Journal of Japanese Applied Physics. 30. 525-527 (1991)

Yuda、Abe、Hasekawa、Suekane、Masuda 和其他 7 人：“充满四甲基锗的脉冲电离室的信号观察”《日本应用物理学杂志》30. 525-527 (1991)。