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博士在中能核物理方面的合作研究。该项目的目标是研究具有能量的热复合核的演化。人们对热原子核的性质非常感兴趣，以便了解恒星中的聚变和裂变过程，创造重元素，并探索核物质相变的可能性。重离子加速器使得在非常宽的能量范围内研究目标-弹丸对的许多组合成为可能。在这个项目中，研究人员将利用位于格勒诺布尔的SARA设施(8-27 MeV/核子)以及在核物理研究所建造的探测器阵列Emric和安布拉进行一系列实验。为了解释和分析结果，在Stony Brook编写了反应模型计算机代码，这些代码处理可以从Emric和Amopora阵列获得的具体和详细的信息。来自EMRIC的小角度粒子-粒子关联数据将通过感知粒子对发射之间的时间间隔来探索反应动力学。来自大接受度(82%)的两面体阵列的数据将提供单个蒸发级联中一组带电粒子的逐个事件画像。在这项联合努力中，美国科学家将从使用法国最先进的设施以及与一群处于重离子反应测量前沿的物理学家合作中受益匪浅。法国方面显然将受益于石溪集团近年来开发的专业知识和计算机代码。该项目的结果可能会对高激发态原子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.