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To understand the origin of the chemical elements is one of the biggest challenges in science. N

了解化学元素的起源是科学中最大的挑战之一。

基本信息

批准号：
2893301
负责人：
金额：
--
依托单位：
University of Surrey
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2023
资助国家：
英国
起止时间：
2023 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2893301
关键词：
understand origin chemical elements biggest

项目摘要

Nuclear physics research has provided a broad picture of element creation, but many holes in that picture remain. We still do not know the main astrophysical site for nucleosynthesis of heavy elements. Possible scenarios include supernovae explosions and mergingneutron stars. The latter events are also sources of gravitational waves that may provide useful information about element creation. Many questions about element creation will be addressed on the international stage by a new generation of nuclear research facilities such as FRIB, FAIR, HIE-ISOLDE and RIBF-RIKEN. In these facilities, the properties of atomic nuclei of great relevance or galactic chemical evolution will be probed with nuclear reactions. Rapid neutron capture reactions, which occur in stellar plasma environments, is the key process (r-process) driven the formation of elements heavier than iron. This project aims at describing neutron-capture reactions using a quantum dynamical reaction framework. It will be based on LindbladÂs theory for open quantum systems, incorporating nuclear structure informationextracted from the energy density functional theory. Theoretical calculations of neutron capture cross sections will be compared with those from existing statistical nuclear reaction models as well as experimental data. Both thermal and atomic effects on the neutron capture process will be addressed

核物理学研究已经提供了一个元素创造的广阔图景，但在这幅图景中仍然存在许多漏洞。我们仍然不知道重元素核合成的主要天体物理场所。可能的场景包括超新星爆炸和中子星合并。后者也是引力波的来源，可以提供有关元素创造的有用信息。关于元素创造的许多问题将在国际舞台上由新一代的核研究设施，如FRIB，FAIR，HIE-ISOLDE和RIBF-RIKEN解决。在这些设施中，将利用核反应探测与银河系化学演化有重大关系的原子核的性质。在恒星等离子体环境中发生的快速中子俘获反应是驱动比铁重的元素形成的关键过程（r过程）。该项目旨在使用量子动力学反应框架描述中子俘获反应。它将基于Lindblad的开放量子系统理论，结合从能量密度泛函理论中提取的核结构信息。中子俘获截面的理论计算将与现有的统计核反应模型以及实验数据进行比较。热效应和原子效应对中子俘获过程的影响都将得到解决