Beta-decay studies for applied and basic nuclear physics
Beta-decay studies for applied and basic nuclear physics
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DOI：
10.1140/epja/s10050-020-00316-4
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
A. Algora;J. Tain;B. Rubio;M. Fallot;W. Gelletly
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文献类型：
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作者：
A. Algora;J. Tain;B. Rubio;M. Fallot;W. Gelletly
在这篇评论中，我们将介绍最近衰变研究的结果，使用总吸收技术，涵盖感兴趣的应用，核结构和天体物理学的主题。选择所研究的衰变主要是因为它们对以下预测有很大影响：（a）反应堆中的衰变热，这对当前和未来反应堆的安全很重要;（B）反应堆电子反中微子谱，这对粒子/核物理和反应堆监测很有意义。在这些研究中，选择了总吸收技术，因为它是唯一一种允许人们获得衰变概率的方法，而不受称为Pandemonium效应的系统误差的影响。总吸收技术是基于对初始衰变后的级联的探测。由于这个原因，这项技术需要使用具有很高检测效率的量热计。这里介绍和讨论的测量主要是在于韦斯屈莱大学（芬兰）的IGISOL设施使用JYFLTRAP潘宁阱提供的同位素纯光束进行的。给出的例子表明，我们的测量结果对选定的核有很大的影响预测的衰变热和反中微子谱从反应堆。有些情况下涉及缓发中子发射，因此可以研究的竞争和中子发射状态以上的中子分离能。对天体物理中感兴趣的不稳定核，中子发射比可以用来约束中子俘获截面。从测量中获得的信息还可用于测试天体物理网络计算中感兴趣的衰变的半衰期和Pn值的核模型预测。这些比较还提供了对核图特定区域的核结构方面的见解。
In this review we will present the results of recent-decay studies using the total absorption technique that cover topics of interest for applications, nuclear structure and astrophysics. The decays studied were selected primarily because they have a large impact on the prediction of (a) the decay heat in reactors, important for the safety of present and future reactors and (b) the reactor electron anti-neutrino spectrum, of interest for particle/nuclear physics and reactor monitoring. For these studies the total absorption technique was chosen, since it is the only method that allows one to obtain-decay probabilities free from a systematic error called the Pandemonium effect. The total absorption technique is based on the detection of thecascades that follow the initialdecay. For this reason the technique requires the use of calorimeters with very highdetection efficiency. The measurements presented and discussed here were performed mainly at the IGISOL facility of the University of Jyväskylä (Finland) using isotopically pure beams provided by the JYFLTRAP Penning trap. Examples are presented to show that the results of our measurements on selected nuclei have had a large impact on predictions of both the decay heat and the anti-neutrino spectrum from reactors. Some of the cases involve-delayed neutron emission thus one can study the competition between- and neutron-emission from states above the neutron separation energy. The-to-neutron emission ratios can be used to constrain neutron capture (n,) cross sections for unstable nuclei of interest in astrophysics. The information obtained from the measurements can also be used to test nuclear model predictions of half-lives and Pn values for decays of interest in astrophysical network calculations. These comparisons also provide insights into aspects of nuclear structure in particular regions of the nuclear chart.