RUI:Targetry Development & Nuclear Structure Studies near 100Sn

Esker集团正在圣何塞州立大学（SJSU）开发薄膜生产能力。这些特殊的薄膜，被称为“靶”，将用于粒子加速器设施的核反应，以产生和研究远不稳定的原子核。这个项目的中心重点是利用铁-54 （54Fe）靶和铬-50 （50Cr）光束产生和研究铟-100 （100In）的激发态。100In与最轻的稳定铟同位素铟113 （113In）相差13个中子，从未在这类反应中进行过研究。它之所以特别有趣，是因为它是具有双重魔力的Tin-100 （100Sn）最近的邻居，而Tin-100长期以来一直是实验努力的焦点。在上海外国语大学建立目标能力的一个重要组成部分是引进和教育本科研究学生在核科学。上海州立大学是一所以少数民族本科生为主的大学（PUI & MSI），而核科学在这两所大学都是罕见的。该项目所支持的包容性研究经验将有助于扩大核科学渠道，特别是对妇女和代表性不足的少数民族学生。该项目旨在支持Esker集团的目标工作，以及支持54Fe目标的生产。该靶将用于将在TRIUMF使用EMMA + TIGRESS实验装置进行的54Fe(50Cr, p3n) 100In反应。这将支持已批准的实验S2023，以研究100In （100Sn的β衰变子）的核结构。核景观的这一区域有许多令人兴奋的特征，使其成为实验和理论努力的焦点：在N = 50和Z = 50附近的双重神奇壳闭合，沿N = Z对称线的np相互作用的增强，以及靠近质子滴线。通过在奇奇核100In中填充高自旋态并观察其随后的衰变，该小组希望极大地扩展这种同位素的已知结构。该实验将为进一步发展该区域核行为的理论描述提供有价值的信息。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

The Esker group is developing thin film production capabilities at San José State University (SJSU). These specialized thin films, known as “targets”, are to be used in nuclear reactions at particle accelerator facilities to produce and study nuclei far from stability. A central focus of this project is producing and studying the excited states in Indium-100 (100In) using an Iron-54 (54Fe) target and a Chromium-50 (50Cr) beam. 100In is 13 neutrons away from the lightest stable indium isotope Indium-113 (113In) and has never been studied in this type of reaction. It is of particular interest because it is the nearest neighbor to the doubly magic Tin-100 (100Sn), which has long been a focus of experimental efforts. An important component in establishing the target capabilities at SJSU is the introduction and education of undergraduate research students in nuclear science. SJSU is a primarily undergraduate minority serving institution (PUI & MSI), and nuclear science is a rarity at both of these institutions. The inclusive research experience supported by this project will help to broaden the nuclear science pipeline, especially for women and under-represented minority students.This project seeks to support the target work of the Esker group as well as supporting the production of an 54Fe target. This target will be used in a 54Fe(50Cr, p3n) 100In reaction to be run at TRIUMF using the EMMA + TIGRESS experimental set-up. This will support the approved experiment S2023, to investigate the nuclear structure of 100In, the β-decay daughter of 100Sn. This region of the nuclear landscape has a number of exciting features that make it a focus of experimental and theoretical efforts: the doubly magic shell closure around N = 50 and Z = 50, the enhancement of np interactions along the N = Z symmetry line, and the close proximity to the proton dripline. By populating the high spin states in the odd-odd nucleus 100In and watching its subsequent decay, the group expects to greatly expand the known structure of this isotope. This experiment would provide valuable information to further develop theoretical descriptions of nuclear behavior in this region.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.