Evolving the Physics Case for NUSTAR @ FAIR: Visiting Fellowship Proposal for Prof. Richard F. Casten

NUSTAR @ FAIR 物理案例的发展：Richard F. Casten 教授的访问学者提案

• 批准号: ST/H000542/1
• 负责人: Patrick Regan
• 金额: $ 2.13万
• 依托单位: University of Surrey
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2009
• 资助国家: 英国
• 起止时间: 2009 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FH000542%2F1
• 关键词: Evolving; Physics; Case; NUSTAR; FAIR

The NUSTAR ('NUclear STructure, Astrophysics & Reactions') collaboration at the new Facility for Anti-proton and Ion Research (FAIR), based at Darmstadt, Germany, provides the platform for much of the UK's nuclear physics community's primary research aims over the next decade. The NUSTAR collaboration's experiments at FAIR will enable the exploration of the structure of nuclei at extremes of proton-to-neutron ratio. The further the reach into unexplored regions of the nuclear chart, the more likely the observation of radical new nuclear structure phenomena, including the modification of quantum shell structure and its effect of explosive nucleosynthesis scenarios. Much of our current understanding of the internal makeup of atomic nuclei is based on the concept of shell structure, which is defined by the nature of the mean field produced from the sum of all the inter-nucleon reactions within the nucleonic system. The overall understanding of nuclei in which the proton and neutron separation energies are approximately equal is well established using this shell-model-type picture. However, over the course of the last decade, experimental techniques have evolved considerably, particularly in allowing the synthesis of very exotic, radioactive nuclei with significant proton or neutron excesses compared to the stable isotopes. It has become clear that the standard, spherical shell closures which are observed in nuclei along the line of nuclear beta-stability become modified with an increasing neutron excess. This can lead to a reordering of the single-particle states in the nuclear mean-field potential with the consequence of eroding the shell closures observed for lighter isotones. As such, the search for, and understanding of, these new shell closures in exotic nuclei is one the major aims of current nuclear structure research and will be a particular focus of the experimental NUSTAR programme at FAIR. Prof. Richard F. Casten is currently the D.A. Bromley Professor of Physics at Yale University and Chaired the NUSTAR Programme Advisory Committee which oversaw the ranking of the proposed, initial experimental programmes within the FAIR project. Prof. Casten has published more than 500 articles in the realm of nuclear structure and reaction physics research generating over 7,000 scientific citations. He has made many highly significant contributions to this field of fundamental research, particularly on the underlying nature of nuclear shape and phase transitions. It is anticipated that Prof. Casten will begin his visit in May 2009 and begin discussions with the local Surrey group on experimental signatures for, and theoretical interpretations of structural evolution and nuclear phase transitional behaviour. In particular, discussions will focus on possible regions for future study associated with such phenomena in heavy, neutron-rich nuclei. It is hoped that these discussions will evolve into new physics directions which can be explored by the UK nuclear physics community at the FAIR facility over the coming decade. Prof. Casten's visit will also allow the opportunity for a UK minischool on the physics opportunities for NUSTAR, which will incorporate post-graduate lectures on nuclear physics from Prof. Casten and other lead players within the UK NUSTAR community to highlight the future research opportunities available at FAIR.

在德国达姆施塔特的新反质子和离子研究设施（FAIR）的努斯塔（“NUclear结构、天体物理学和反应”）合作为英国核物理界未来十年的主要研究目标提供了平台。努斯塔合作在FAIR进行的实验将使人们能够探索质子与中子之比极端情况下的原子核结构。越是深入到核图表的未探索区域，就越有可能观察到激进的新核结构现象，包括量子壳层结构的修改及其对爆炸性核合成情景的影响。我们目前对原子核内部组成的理解大多基于壳层结构的概念，壳层结构由核子系统内所有核子间反应之和产生的平均场的性质定义。利用这种壳模型类型的图像，可以很好地建立对质子和中子分离能近似相等的原子核的总体理解。然而，在过去的十年中，实验技术发生了相当大的发展，特别是在允许合成与稳定同位素相比具有显着质子或中子过量的非常奇异的放射性核方面。很明显，在核中沿着核β稳定性线观察到的标准球形壳层闭合随着中子过剩的增加而发生变化。这可能导致核平均场势中的单粒子态的重新排序，其结果是侵蚀了较轻同位素所观察到的壳层闭合。因此，寻找和了解这些新的壳层封闭的奇异核是目前的核结构研究的主要目标之一，并将在FAIR实验努斯塔计划的一个特别重点。Richard F.卡斯滕目前是耶鲁大学的D.A.布罗姆利物理学教授，并担任努斯塔计划咨询委员会主席，该委员会负责监督FAIR项目中拟议的初步实验计划的排名。Casten教授在核结构和反应物理研究领域发表了500多篇文章，产生了7,000多篇科学引文。他对这一基础研究领域做出了许多非常重要的贡献，特别是在核形状和相变的基本性质方面。预计Casten教授将于2009年5月开始访问，并开始与当地萨里小组讨论结构演化和核相变行为的实验特征和理论解释。特别是，讨论将侧重于未来研究的可能区域与重，富中子核中的这种现象。希望这些讨论将演变成新的物理方向，可以由英国核物理界在未来十年的FAIR设施进行探索。Casten教授的访问还将为英国一所小型学校提供机会，为努斯塔提供物理学机会，其中将包括Casten教授和英国努斯塔社区其他主要参与者的核物理研究生讲座，以强调未来的研究机会FAIR提供的机会。

项目成果

High-Spin Study of the Shell Model Nucleus 88 Y 49

• DOI: 10.1103/physrevc.87.044337
• 发表时间: 2013-04
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: M. Bunce;P. Regan;V. Werner;C. Beausang;V. Anagnostatou;M. Bowry;R. Casperson;Danyi Chen;N. Cooper;P. Goddard;R. Hughes;G. Ilie;P. Mason;B. Pauerstein;M. Reed;T. Ross;E. Simpson