Construction of the PHOBOS Time-of-Flight Wall

建造一个用于相对论重离子实验的探测器。探测器将被安置在布鲁克海文国家实验室的相对论重离子对撞机上。这台名为PHOBOS的探测器将首次观察物质在极端能量密度下的行为和衰变，这种能量密度将在质量中心系统中以100GeV/核子的能量对金碰撞中产生。这项工作的目的是描述假想的夸克-胶子等离子体，这种等离子体是在这种高能碰撞中产生的，夸克和胶子被认为是被定义的，与普通强子物质的情况不同。PHOBOS探测器与当前活动相关的特定元素包括粒子识别系统，该系统将允许分别识别来自夸克-胶子等离子体衰变的不同介子，这对于表征等离子体的特性非常重要。PHOBOS收集的数据将把我们对物质的认识扩展到能量和密度，这些物质被认为只存在于早期宇宙的最初微秒。美国国家科学基金会/美国能源部核科学咨询委员会在其1996年的长期计划中确定了这一主题，这是美国核科学领域的一个高度优先事项。培养学生和博士后是这个实验项目的重要组成部分。

Construction of a detector for use in relativistic heavy ion experiments will be carried out. The detector will be sited at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. The detector, known as PHOBOS, will provide a first look at the behavior and decay of matter at the extreme energy densities that will be created in gold-on-gold collisions with energies of 100GeV/nucleon in the center-of-mass system. This work is aimed at characterizing the hypothesized quark-gluon plasma which is created in such energetic collisions, and in which quarks and gluons are thought to be deconfined, unlike the case in normal hadronic matter. Specific elements of the PHOBOS detector associated with the present activity include the particle identification system which will permit the different mesons coming from decay of the quark-gluon plasma to be separately identified, which is important to characterizing the properties of the plasma. The data gathered by PHOBOS will extend our knowledge of matter to energies and densities thought to have existed only in the first microseconds of the early universe. This topic is a high priority within US nuclear science, as established by the joint NSF/DOE Nuclear Science Advisory Committee in its 1996 Long Range Plan. Education of students and postdocs is a strong component of this experimental program.