US-France Cooperative Research: The Evolution of Hot Composite Nuclei with Energy

该奖项将支持纽约州立大学石溪分校的John Alexander博士和法国格勒诺布尔核科学研究所的Serge Kox博士在中能核物理领域的合作研究。该项目的目的是研究热复合核的演化与能量。热原子核的性质对理解恒星的聚变和裂变过程、重元素的产生以及寻找核物质相变的可能性具有极大的兴趣。重离子加速器使得在很宽的能量跨度内研究靶弹对的多种组合成为可能。在这个项目中，研究人员将使用格勒诺布尔的SARA设备（8-27 MeV/nucleon）以及核物理研究所建造的EMRIC和AMPHORA探测器阵列进行一系列实验。为了解释和分析结果，在Stony Brook已经编写了反应模型计算机代码，以解决可以从EMRIC和AMPHORA阵列获得的具体和详细信息。EMRIC的小角度粒子-粒子相关数据将通过感知粒子对发射之间的时间间隔来探测反应动力学。来自大接受度（82%）的AMPHORA阵列的数据将提供单个蒸发级联中一组带电粒子的事件肖像。在这一共同努力中，美国科学家将从使用最先进的法国设备中受益匪浅，这些设备在美国是不常见的，而且有机会与一群处于重离子反应测量前沿的物理学家一起工作。法方显然将受益于石溪小组近年来开发的专业知识和计算机代码。这个项目的结果可能对高激发核的集体性质产生重要的新见解。

This award will support collaborative research in intermediate energy nuclear physics between Dr. John Alexander, State University of New York at Stony Brook and Dr. Serge Kox, Institute for Nuclear Science, Grenoble, France. The objective of the project is to investigate the evolution of hot composite nuclei with energy. The properties of hot atomic nuclei are of great interest, in order to understand fusion and fission processes in stars, in the creation of heavy elements, and in the search for the possibility of phase transitions in nuclear matter. Heavy ion accelerators make it possible to study many combinations of target-projectile pairs over a very wide energy span. In this project, the investigators will carry out a series of experiments, using the SARA facility at Grenoble (8-27 MeV/nucleon) along with the detector arrays EMRIC and AMPHORA constructed at the Institute for Nuclear Physics. For the interpretation and analysis of results, reaction model computer codes have been written at Stony Brook that address the specific and detailed information that can be obtained from the EMRIC and AMPHORA arrays. The small angle particle- particle correlation data from EMRIC will probe the reaction dynamics by sensing the time intervals between emissions of particle pairs. Data from the large-acceptance (82%) AMPHORA array will provide event by event portraits of the set of charged particles in individual evaporation cascades. In this joint effort, the US scientists will benefit significantly from the use of state of the art French facilities not routinely available in the US, as well as the opportunity to work with a group of physicists who are at the frontier of heavy-ion reaction measurements. The French side will clearly benefit from the expertise and computer codes developed in recent years by the Stony Brook group. The results of this project may yield important new insight into the collective properties of highly excited nuclei.