CAREER:beta-decay experiments to constrain astrophysical processes

职业：限制天体物理过程的β衰变实验

• 批准号: 1350234
• 负责人: Artemisia Spyrou
• 金额: $ 46.04万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-05-01 至 2021-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1350234&HistoricalAwards=false
• 关键词: CAREER; beta; decay; experiments; constrain

The present CAREER award integrates research and educational components focused on the understanding of nuclear properties and their application to the interdisciplinary field of nuclear astrophysics. The main focus of the research is to address the question: How were the heavy elements made? The research component aims at the study of the decay properties of exotic nuclei utilizing the technique of Total Absorption Spectroscopy (TAS). Measurements will focus on nuclei along the rapid-neutron-capture process (or r-process), which is believed to be responsible for the origin of half of the heavy elements. The measurements will build on the previous experience of the PI in the development and use of a Total Absorption Spectrometer and will utilize existing equipment at the National Superconducting Cyclotron Laboratory together with the implementation of new proposed equipment, in this case a tape transport system for the removal of background activity from the detection area. The technical focus of the research is through the measurement of beta-decay strength distributions of nuclei along the astrophysical r-process. The beta-decay strength distribution is the only reliable parameter for constraining the theoretical models used in r-process calculations and improving their predictive power. The PI will also establish a unique, new one-week summer school for rising juniors in the area of nuclear physics. The school will be available to 12 students each summer and provide hands-on laboratory activities as well as instruction in nuclear physics. Students from schools that do not offer an undergraduate course in nuclear physics will benefit from this summer school. Ultimately it is important to increase the number of graduate students in the field of low-energy nuclear structure physics, which is important not only for the basic science addressed, but as a training ground for skilled workers in critical areas of homeland security.

目前的职业奖包括研究和教育部分，重点是了解核性质及其在核天体物理学跨学科领域的应用。这项研究的主要焦点是解决这样一个问题：重元素是如何制成的？研究部分旨在利用全吸收光谱(TAS)技术研究奇异核的衰变性质。测量将集中在快速中子俘获过程(或称r过程)沿线的原子核，据信这是一半重元素的来源。这些测量将建立在PI以前开发和使用全吸收光谱仪的经验的基础上，并将利用国家超导回旋加速器实验室的现有设备，以及实施拟议的新设备，在这种情况下，磁带传输系统用于从探测区域移除背景活动。这项研究的技术重点是通过测量天体物理r过程中原子核的β衰变强度分布。β衰变强度分布是约束r过程计算中使用的理论模型并提高其预测能力的唯一可靠参数。国际和平研究所还将为核物理领域的大三学生建立一个独特的、新的为期一周的暑期学校。该学校每年夏天将向12名学生开放，并提供动手实验室活动和核物理指导。来自不提供核物理本科课程的学校的学生将从这个暑期班中受益。归根结底，重要的是增加低能核结构物理领域的研究生人数，这不仅对所涉及的基础科学很重要，而且是国土安全关键领域的熟练工人的培训基地。

项目成果

Co69,71 β -decay strength distributions from total absorption spectroscopy

Co69,71β - 全吸收光谱的衰变强度分布

• DOI: 10.1103/physrevc.100.025806
• 发表时间: 2019
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Lyons, S.;Spyrou, A.;Liddick, S. N.;Naqvi, F.;Crider, B. P.;Dombos, A. C.;Bleuel, D. L.;Brown, B. A.;Couture, A.;Campo, L. Crespo
• 通讯作者: Campo, L. Crespo