Joint Study on Non-Accelerator Physics [LVD+LMD]

非加速器物理联合研究 [LVD LMD]

• 批准号: 08044086
• 负责人: WADA Tomonori
• 金额: $ 4.16万
• 依托单位: Okayama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044086/
• 关键词: Large Volume Detector(LVD); Liquid Scintillator; Undeground Laboratory; Thermoluminesent sheet; Stellar collapse neutrino; Gut momopole; Large Maasive Detector(LMD); Super-slow heavy particles; 熱ルミネッセンスシート; TLシート; ニュートリノ現象

1. The Large Volume Detector (LVD) Experiment in the Gran Sasso underground Laboratory is a multipurpose detector consisting of a large volume of liquid scintillator interleaved with limited streamer tubes in a compact 3-dimensional geometry. A major purpose of the LVD neutrino observatory is to search for stellar collapses. The first tower (368 tons per one tower) was turn on in June 1992 and the second tower also in 1997. The current neutrino events are 500/(10 min. ) and muon ones 40/(10 min. ). This mass of liquid scintillator makes the two towers the largest super novae neutrino observatories in the world and the largest one based on liquid scintillator. The third tower is under construction. The LVD group presented the power of LVD to study low-energy neutrinos, the results of a search for stellar collapse signals in our Galaxy during this initial period and the first results of the combined measurements of the EAS-TOP (at the surface) and LVD (deep underground) detectors operating as a combined telescope in the study of the cosmic ray primary composition. The measured depth-angular distribution of muon intensities analyzed and the values of the upper limit on the ratio of prompt muon flux to that of pions have been obtained during 21804 hours of operation of the first LVD tower.2. The Large Massive Detector (LMD) Experiment : The thermoluminescent (TL) sheet stacks and its readout system have been developed for the detection of super-slow heavy particles (for example, GUT monopoles). The TL-Sheet stack (TLS) is consists of five TL sheets and eight medical X-ray films with double vacuum package. The TLS of the 25 mィイD12ィエD1 were set on LVD tanks in August 1996 at lower background sate of radio activities than Mont Blanc tunnel. These stack shall be analyzed for studying the search of super-slow heavy particles and alpha particle production by muon-nuclei interactions in Gran Sasso tunnel walls.

1. 格兰萨索地下实验室的大体积探测器（LVD）实验是一个多用途探测器，由大量的液体闪烁体与有限的流光管交织在紧凑的三维几何结构中组成。LVD中微子天文台的一个主要目的是寻找恒星坍缩。第一座塔（每塔368吨）于1992年6月启用，第二座塔也于1997年启用。目前的中微子事件是500/（10分钟），μ子事件是40/（10分钟）。大量的液体闪烁体使这两座塔成为世界上最大的超新星中微子观测站，也是基于液体闪烁体的最大的观测站。第三座塔正在建设中。LVD小组展示了LVD研究低能中微子的能力，在这个初始阶段在我们的银河系中搜索恒星坍缩信号的结果，以及easa - top（在地表）和LVD（地下深处）探测器联合测量的第一个结果，这些探测器作为联合望远镜在研究宇宙射线的主要成分。分析了第一台LVD塔运行21804小时时所测得的μ子强度的深角分布和瞬发μ子通量与介子通量之比的上限值。大型质量探测器（LMD）实验：开发了热释光（TL）片堆及其读出系统，用于检测超慢速重粒子（如GUT单极子）。TL- sheet stack （TLS）是由5张TL片和8张医用x射线片组成的双层真空封装。1996年8月，在比勃朗峰隧道更低的背景辐射安全条件下，在LVD坦克上设置了25 m的TLS。为了研究在Gran Sasso隧道壁上寻找超慢重粒子和通过介子-原子核相互作用产生α粒子，需要对这些叠加进行分析。

项目成果

M. Aglietta: "The high energy muon spectrum in extensive air showers : First data from LVD and EAS-TOP at Gran Sasso"Proc. 25^<th> Int. Conf. on Cosmic Rays, Durban, South Africa. 6. 353-356 (1997)

M. Aglietta：“广泛空气簇射中的高能 μ 子谱：来自 Gran Sasso 的 LVD 和 EAS-TOP 的第一个数据”Proc。

M. Aglietta: "Upper limit on the prompt muon flux from the LVD data"Proc. 25^<th> Int. Conf. on Cosmic Rays, Durban, South Africa. 6. 341-344 (1997)

M. Aglietta：“来自 LVD 数据的即时 μ 子通量的上限”Proc。

M. Aglietta: "Study of neutrinos from stellar collapses with the LVD experiment in the Gran Sasso Laboratory"Proc. 25ィイD1thィエD1 Int. Conf. on Cosim Rays, Durban, South Africa. Vol.7. 33-36 (1997)

M. Aglietta：“利用格兰萨索实验室的 LVD 实验研究中微子”，Cosim Rays 会议，第 7 卷，1997 年。

M. Aglietta: "Study of neutrinos from stellar collapses with the LVD experiment in the Gran Sasso Laboratory"Proc. 25^<th> Int. Conf. on Cosmic Rays, Durban, South Africa. 7. 33-36 (1997)

M. Aglietta：“通过格兰萨索实验室的 LVD 实验研究恒星塌缩产生的中微子”Proc。

M.Aglietta: "Large TeV and GeV muon multiplicities in EAS : separation of P and heavy primaries at 10^<15> eV" Proc.25th Int.Conf.of Cosmic Rays,Durban,South Africa. 6. 165-168 (1997)

M.Aglietta：“EAS 中的大 TeV 和 GeV muon 多重性：10^<15> eV 处 P 和重初级的分离”Proc.25th Int.Conf.of Cosmic Rays，南非德班。