Laser spectroscopic determination of new forms of nuclear matter in the trans-lead nuclei.

激光光谱测定反式铅核中新形式的核物质。

• 批准号: ST/G006415/1
• 负责人: Kieran Flanagan
• 金额: $ 56.1万
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2009
• 资助国家: 英国
• 起止时间: 2009 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FG006415%2F1
• 关键词: Laser; spectroscopic; determination; new; forms

In the subject of Nuclear Physics there exists several key open questions, these include the limits of nuclear existence, whether new forms of matter are present in loosely bound nuclei and how does the ordering of the quantum system change at these extremes. It is only possible to provide answers to these questions by directly studying exotic nuclei that are unstable with respect particle emission. The discovery of a diffuse halo structure in light nuclei such as 8He, 11Li and 14Be, is one example of nuclear structure that surprised the entire nuclear community. These incredibly systems, with just a few nucleons have a diffuse structure that is comparable in size to some of the heaviest nuclei known in nature such as 238U. With a new technique that offers a vast improvement in sensitivity, this fellowship has the unique opportunity to make measurements in a region of the nuclear chart previously described as 'terra incognito'. Such measurements offer the tantalizing possibility of discovering new structural phenomena and thereby begin to provide answers to the current open questions in Nuclear Physics. This fellowship will unambiguously measure specific nuclear observables, which can be extracted without invoking nuclear models, by studying the orbital atomic electron. Although often quoted as negligible there is a finite interaction between the nucleus and the atomic electrons, which is approximately a hundred million times smaller than the energy spacing of quantum levels within the atom. Such small effects are well within the scope of modern laser technology, which can perform measurements with an unprecedented resolution of one part in a thousand billion! This proposal will accurately measure the change in energy of the outer atomic electron in exotic radioactive isotopes and by doing so extract several key nuclear observables; the magnetic and electric moments, the angular momentum of the nuclear state and the change in the average charge radius of nucleus. These observables provide a wealth of information on the distribution of matter and how the quantum levels are ordered within the nucleus. This proposal will therefore be a significant part of the UK strategy in nuclear physics research providing for the first time, measurements on exotic nuclei where new forms of matter may exist.

在核物理学的主题中，存在几个关键的开放问题，这些问题包括核存在的极限，新形式的物质是否存在于松散束缚的核中，以及量子系统的有序性如何在这些极端情况下发生变化。只有通过直接研究在粒子发射方面不稳定的奇异核，才有可能回答这些问题。在轻核如8He、11 Li和14 Be中发现弥散晕结构，是令整个核科学界感到惊讶的核结构的一个例子。这些令人难以置信的系统，只有几个核子，具有扩散结构，其大小与自然界中已知的一些最重的核（如238 U）相当。随着一项新技术，提供了一个巨大的提高灵敏度，这个奖学金有独特的机会，使测量在一个地区的核图表以前描述为'未知地带'。这样的测量提供了发现新的结构现象的诱人的可能性，从而开始为当前核物理学中悬而未决的问题提供答案。该研究金将通过研究轨道原子电子来明确测量特定的核可观测量，这些可观测量可以在不调用核模型的情况下提取。尽管经常被认为可以忽略不计，但原子核和原子电子之间存在有限的相互作用，该相互作用比原子内量子能级的能量间隔小大约一亿倍。这种微小的影响完全在现代激光技术的范围内，它可以以前所未有的千亿分之一的分辨率进行测量！该提议将精确测量外来放射性同位素中外层原子电子的能量变化，并通过这样做提取几个关键的核观测值;磁矩和电矩，核状态的角动量以及核平均电荷半径的变化。这些观测值提供了大量关于物质分布以及量子能级在原子核内如何排列的信息。因此，这一建议将成为联合王国核物理研究战略的重要组成部分，首次提供对可能存在新形式物质的奇异核的测量。

项目成果

Laser Spectroscopy of Neutron-Rich ^{207,208}Hg Isotopes: Illuminating the Kink and Odd-Even Staggering in Charge Radii across the N=126 Shell Closure.

富中子 ^{207,208}Hg 同位素的激光光谱：照亮 N=126 壳闭合区域电荷半径的扭结和奇偶交错。

• DOI: 10.1103/physrevlett.126.032502
• 发表时间: 2021
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: Day Goodacre T

Early onset of deformation in the neutron-deficient polonium isotopes

缺中子钋同位素早期开始变形

• DOI: 10.1088/1742-6596/381/1/012072
• 发表时间: 2012
• 期刊: Conference Series
• 作者: Cocolios T

High-resolution laser spectroscopy with the Collinear Resonance Ionisation Spectroscopy (CRIS) experiment at CERN-ISOLDE

• DOI: 10.1016/j.nimb.2015.11.024
• 发表时间: 2016-06
• 期刊: Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
• 影响因子: 1.3
• 作者: T. Cocolios;R. Groote;J. Billowes;M. Bissell;I. Budincevic;T. D. Goodacre;G. Farooq-Smith;V. Fedosseev;K. Flanagan;S. Franchoo;R. Ruiz;W. Gins;H. Heylen;T. Kron;Ruohong Li;K. Lynch;B. Marsh;G. Neyens;R. Rossel;S. Rothe;A. Smith;H. H. Stroke-H.;K. Wendt;S. Wilkins;Xiaofei Yang

Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry

• DOI: 10.1103/physrevc.90.014317
• 发表时间: 2014-07
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: I. Budinvcevi'c;J. Billowes;M. Bissell;T. Cocolios;R. P. Groote;S. Schepper;V. Fedosseev;K. Flanagan;S. Franchoo;R. Ruiz;H. Heylen;K. Lynch;B. Marsh;G. Neyens;T. Procter;R. Rossel;S. Rothe;I. Strashnov;H. H. Stroke-H.;K. Wendt

Structure of 191 Pb from a- and ß-decay spectroscopy

a 和 β 衰变光谱中 191 Pb 的结构

• DOI: 10.1088/0954-3899/37/12/125103
• 发表时间: 2010
• 期刊: Nuclear and Particle Physics
• 作者: Cocolios T