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Emulsion Chamber Joint Experiment at Mt. Chacaltaya

查卡尔塔亚山乳化室联合实验

基本信息

批准号：
02044139
负责人：
FUJIMOTO Yoichi
金额：
$ 8.32万
依托单位：
Science and Engineering Research Laboratory, Waseda University.
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
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

项目摘要

(1) The emulsion chambers of the following types were constructed at Chacaltaya Observatory (5,200m, Bolivia) on 7-22 Mar.1991.Disassemblage of the chambers was made on 6-16 Oct. 1992, and the photographic processing of X-ray films was made on 26 Oct. - 13 Nov. in Campinas University in Brasil. X-ray films after the development were distributed to the participating institutions, and the measurement of the showers in the observed families is under way.Air shower array, located so as to surround the emulsion chamber, was operated simultaneously and therefore the data of air showers, accompanying the families, are available for high energy events.(2) The international workshop on 'Super-High Energy Hadron Interactions' was held in Tokyo on 8-12 Oct. 1991, under the auspices of this program. The goals of the workshop were to summarize the present status of the studies on high energy nuclear interactions, to discuss the meaning of cosmic-ray exotic events (see below) and to discuss the dire … More ction of future cosmic-ray experiments to study nuclear interactions.More than 50 participants (including 12 from abroad among whom 8 were supported by this program) in the fields of cosmic-ray, high energy and elementary particle physics attended the workshop.(3) The following are the main points on high energy nuclear interactions, which were made clear through the activity of this program..strong break-down of Feynman scaling law in the forward region in pion multiple production,.steady accumulation of candidates of cosmic-ray exotic events,.rapid energy dissipation in nuclear interactions, observed by the experiment to operate the emulsion chamber and air shower arry simultaneously.The cosmic-ray exotic events of Centauro, etc., which were observed by emulsion chamber experiments at Mt. Chacaltaya, are assumed tentatively to be the multiple production of non-pionic particles, and can be classified into several types experimentally. The facts listed above indicate that there is a change of the characteristics in nuclear interactions at high energy. To explain all of these facts in a unified way, we propose as a working hypothesis that in the energy region exceeding 10^<16> eV there exists a new channel which transmutes ordinary hadrons (h) into exotic hadrons (h') via quark-gluon plasma phase. And exotic hadrons have several states corresponding to the several types of cosmic-ray exotic events. Less

(1)1991年3月7-22日在玻利维亚Chacaltaya天文台(5200米)建造了下列类型的乳胶室。1992年10月6-16日在巴西坎皮纳斯大学进行了乳胶室的拆解，并于10月26日-11月13日在巴西坎皮纳斯大学进行了X光片的照相冲洗。显影后的X光胶片分发给参与机构，并正在对被观测家庭的簇射进行测量。位于乳胶室周围的空气簇射阵列同时运行，因此可以获得伴随家庭的空气簇射数据，用于高能事件。(2)在该计划的赞助下，1991年10月8-12日在东京举行了国际超高能强子相互作用研讨会。研讨会的目的是总结高能核相互作用的研究现状，讨论宇宙线奇异事件的意义(见下文)，并讨论Dre…。未来宇宙线实验更多地用于研究核相互作用。宇宙线、高能和基本粒子物理领域的50多名与会者(其中12人来自国外，其中8人得到本计划的支持)参加了研讨会。(3)以下是关于高能核相互作用的主要观点，这些要点通过本计划的活动得到了阐明。介子多重产生前进区费曼标度定律的强烈破坏，宇宙线奇异事件候选者的稳定积累，核相互作用中的快速能量耗散，通过乳胶室实验观察到乳胶室与空气簇射同时进行，通过乳胶室实验观察到半人马座宇宙线奇特事件等。Chacaltaya，暂定为非离子粒子的多重产物，实验上可分为几种类型。上述事实表明，高能核相互作用的特征发生了变化。为了统一地解释所有这些事实，我们提出了一个工作假设，即在超过10^&lt；16&gt；ev的能区，存在一个新的通道，它通过夸克-胶子等离子体相将普通强子(H)转变为奇异强子(h‘)。而奇异强子有几种状态与几种类型的宇宙射线奇异事件相对应。较少