Shape co-existence in neutron-rich A~110 nuclei

富中子A~110核中的形状共存

• 批准号: EP/E030734/1
• 负责人: Alison Bruce
• 金额: $ 5.2万
• 依托单位: University of Brighton
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FE030734%2F1
• 关键词: Shape; co; existence; neutron; rich

At the centre of every atom there is a nucleus and information about how nuclei behave is relevant to many areas, including medical diagnosis and sometimes therapy, nuclear power etc. Hence it is important that we build up a picture of how nuclei react under different circumstances. For example why are some nuclei stable or, if they do decay, why do they do so by a particular method? Why do nuclei take on different shapes and what are the forces which drive them to these shapes? There are possibly 6000 combinations of neutrons and protonswhich could stick together to form nuclei that would live long enough tobe observed. Of these only about 300 exist in nature and most of ourknowledge of nuclei and their properties comes from the detailedstudy of these 300. Hence in order to test our models of nuclear forces, we have to make and study new systems. Normally when we make a nucleus in an excited state, it decays within a fraction (typically about 1 divided by 10 with 15 noughts after it) of a second . Sometimes a nucleus gets stuck in one particular configuration which then lives for a time longer than 1 thousand millionth of a second. We call these states isomeric and this research proposal is to search for such states which are predicted to exist in the heavy zirconium nuclei. It is not just the finding of these states which is the experimental goal but once they are found, if indeed they do exist, we propose to measure their properties and test them against the model predictions. The results of this comparison will be used to further refine the models so that they can be used to extrapolate beyond the nuclei for which they were developed. This information will therefore give us a clearer view of how nuclei behave and hence will enable us to use them to their maximum potential.

每个原子的中心都有一个原子核，有关原子核如何行为的信息与许多领域有关，包括医学诊断，有时甚至是治疗，核能等。例如，为什么有些原子核是稳定的，或者如果它们确实衰变，为什么它们是通过一种特殊的方法衰变的？为什么原子核会呈现出不同的形状，是什么力量驱使它们呈现出这些形状？可能有6000种中子和质子的组合，它们可以粘在一起形成原子核，这些原子核的寿命足够长，可以被观察到。其中只有大约300种存在于自然界中，我们对原子核及其性质的大部分认识都来自于对这300种原子核的详细研究。因此，为了检验我们的核力模型，我们必须制造和研究新的系统。通常情况下，当我们使一个原子核处于激发态时，它会在一秒的几分之一（通常约为1除以10，后面有15个零）内衰变。有时候，一个原子核会停留在一个特定的构型，然后它的寿命超过十亿分之一秒。我们称这些态为同质异能态，本研究的目的是寻找可能存在于重锆核中的同质异能态。实验的目标不仅仅是发现这些状态，而且一旦发现它们，如果它们确实存在，我们建议测量它们的性质并根据模型预测进行测试。这种比较的结果将被用来进一步完善模型，使它们可以用来外推超出他们开发的核。因此，这些信息将使我们更清楚地了解原子核的行为，从而使我们能够最大限度地利用它们。

项目成果

Identification of Excited States in the N=Z Nucleus 82Nb

N=Z 核 82Nb 中激发态的识别

• 发表时间: 2007
• 作者: L Caceres

First Results from the Stopped Beam Isomer Rising Campaign at GSI

GSI 停止梁异构体增加活动的初步结果

• 发表时间: 2007
• 作者: S Pietri

Observation of isomeric decays in the r-process waiting-point nucleus 130Cd82.

r 过程等待点核 130Cd82 中异构体衰变的观察。

• DOI: 10.1103/physrevlett.99.132501
• 发表时间: 2007
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: Jungclaus A

Isomeric States in the Light Tc Isotopes

轻 Tc 同位素中的异构态

• 发表时间: 2007
• 作者: A Garnsworthy

Identification of Isomeric States `South' of 208Pb via Projectile Fragmentation

通过射弹破碎鉴定 208Pb“南”异构态

• 发表时间: 2007
• 作者: S Steer