US-Federal Republic of Germany Cooperative Research: Bombarding Energy Dependence of Multi-fragmentation

美德合作研究：轰炸多碎片能量依赖性

• 批准号: 8922454
• 负责人: William Lynch
• 金额: $ 1.18万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-01 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8922454&HistoricalAwards=false
• 关键词: US; Federal; Republic; Germany; Cooperative

This award supports Drs. William G. Lynch, C. Konrad Gelbke and others of Michigan State University to collaborate in physics research with Drs. Uli Lynen, W. Trautmann and J. Pochodzalla of the University of Frankfurt and the Gesellschaft fuer >Schwerionenforschung (GSI) at Darmstadt, FRG. They are >investigating the properties of multifragment breakup mechanisms in order to obtain information about the equation of state and liquid.gas phase transition of dilute nuclear matter. MSU has a compact and highly granular intermediate mass fragment detection array, the MINIBALL. Measurements with this device require small halo.free Krypton beams at an energy level and quality not available in the U.S. Such beams will be available in the near future at GSI, which will be the best facility of its kind in the world; however, there is no array similar to MINIBALL at GSI. The collaboration, therefore, is based on transporting the array to Germany to bring these two complementary state of the art devices together. Calculations suggest that multifragmentation may occur in heavy ion reactions over a wide range of incident energies. Few measurements to date have addressed the properties of collisions which lead to the production of many intermediate mass fragments. MINIBALL was constructed to look for intermediate mass fragments and provide information about highly excited and dilute nuclear matter. In conjunction with the ALADIN spectrometer, it will be possible to measure multifragmentation processes for Krypton induced reactions over the energy range 50 to 1000 MeV. Studies in this range will complement the ongoing research effort at MSU where reactions at lower energies are being explored. The results of their initial survey of the Kr.Nb system will have a significant impact on the directions of subsequent heavy ion experiments. Once incident energies at which multifragment breakup mechanisms are dominant have been identified, detailed comparisons to dynamical and statistical multifragmentation models will be performed.

该奖项支持博士。 William G. Lynch，C。KonradGelbke和密歇根州立大学的其他人与Drs合作。 Frankfurt大学的Uli Lynen，W。Trautmann和J. Pochodzalla以及FRG Darmstadt的Gesellschaft Fuer> Schwerionenforschung（GSI）。 他们正在研究多碎片破裂机制的性质，以获取有关状态和液体方程的信息。 MSU具有紧凑且高度颗粒状的中间质量片段检测阵列Miniball。 使用该设备的测量需要小的光晕。美国在美国无法使用的能级和质量上的无孔梁，将在GSI的不久的将来提供，这将是世界上同类产品的最佳设施。但是，GSI上没有类似于Miniball的数组。 因此，该合作是基于将阵列运送到德国，将这两种互补状态的设备融合在一起。 计算表明，在各种入射能范围内，重离子反应可能发生多重碎片。 迄今为止，很少有测量可以解决导致许多中间质量片段产生的碰撞的特性。 Miniball的构建是为了寻找中间的质量碎片，并提供了有关高度激发和稀释的核物质的信息。 结合Aladin光谱仪，可以在50至1000 MeV的能量范围内测量klypton诱导的反应的多片剂过程。 在此范围内的研究将补充MSU正在进行的研究工作，其中正在探索较低能量的反应。 他们对KR.NB系统的初步调查的结果将对随后的重离子实验的方向产生重大影响。 一旦确定了多碎片分解机制的入射能，将进行详细的比较与动态和统计多碎片模型的比较。