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。这些被称为“靶”的特殊薄膜将被用于粒子加速器设施的核反应中，以生产和研究远离稳定性的原子核。这个项目的一个中心焦点是利用铁-54(54Fe)靶和铬-50(50Cr)束流产生和研究铟-100(100in)中的激发态。100In距离最轻的稳定铟同位素铟-113(113In)有13个中子，从未在这种类型的反应中被研究过。它之所以特别令人感兴趣，是因为它是最接近双魔术的锡星-100(100Sn)，而锡-100一直是实验工作的焦点。在上海外国语大学建立目标能力的一个重要组成部分是介绍和教育核科学本科生。上海州立大学主要是一所为少数族裔服务的本科院校，核科学在这两所院校中都是罕见的。该项目支持的包容性研究经验将有助于拓宽核科学渠道，特别是对妇女和代表性不足的少数族裔学生。该项目力求支持Esker小组的目标工作以及支持制作54Fe靶。这个靶将用于在TRIUMF使用Emma+TIGRESS实验装置运行的54Fe(50Cr，p3n)100In反应。这将支持已批准的实验S2023，即研究100In的核结构，100In是100Sn的β衰变子体。这一核图区域具有许多令人兴奋的特征，使其成为实验和理论工作的焦点：N=50和Z=50附近的双魔力壳层封闭，沿N=Z对称线的NP相互作用增强，以及靠近质子滴线。通过填充奇奇核100in中的高自旋态并观察其随后的衰变，该小组预计将极大地扩展这种同位素的已知结构。这项实验将为进一步发展该地区核行为的理论描述提供有价值的信息。这一裁决反映了NSF的法定使命，并通过使用基金会的智力优势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.