Review of isomer properties

异构体性质回顾

• 批准号: ST/H008640/1
• 负责人: Philip Malzard Walker
• 金额: $ 0.5万
• 依托单位: University of Surrey
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FH008640%2F1
• 关键词: Review; isomer; properties

Isomers are long-lived excited states of atomic nuclei, with half-lives ranging up to many years. They arise due to unusual combinations of spin and shape. Spin isomers, in particular, are dependent on the behaviour of individual protons and neutrons in the nucleus, and they give basic nuclear structure information. The long half-lives enable accurate measurements of, for example, the shapes and sizes of excited nuclear states, providing sensitive tests of theoretical calculations. Historically, isomers have played, and continue to play, a key role in theoretical developments, for both spherical and non-spherical nuclei. A priority of UK nuclear physics today is the exploration and understanding of the limits to nuclear binding (at the so-called 'drip-lines' and for 'superheavy' elements). In this context, spin isomers have special importance, since they can provide extra stability for the most exotic, short-lived nuclei. This realization gives strong emphasis to the need to understand isomer properties, especially their half-lives. The visit of Professor G.D. Dracoulis (from the Australian National University, Canberra) will stimulate isomer physics in the UK through networking and giving talks, with a focus on the preparation of an isomer review article in collaboration with Professor P.M. Walker (at the University of Surrey, Guildford).

同分异构体是原子核的长寿命激发态，其半衰期可达多年。它们是由于旋转和形状的不寻常组合而产生的。特别是自旋异构体，依赖于原子核中单个质子和中子的行为，它们提供了基本的核结构信息。较长的半衰期使人们能够精确测量，例如，激发态的形状和大小，为理论计算提供敏感的测试。从历史上看，同分异构体在球形和非球形核的理论发展中已经并将继续发挥关键作用。今天，英国核物理学的一个重点是探索和理解核结合的极限（在所谓的“滴线”和“超重”元素）。在这种情况下，自旋异构体具有特殊的重要性，因为它们可以为最奇特的、寿命最短的原子核提供额外的稳定性。这一认识强调了理解同分异构体性质的必要性，特别是它们的半衰期。G.D. Dracoulis教授（来自堪培拉的澳大利亚国立大学）的访问将通过网络和讲座刺激英国的同分异构体物理学，重点是与pm . william教授合作准备一篇同分异构体综述文章沃克（萨里大学吉尔福德分校）。

项目成果

Hindered decays from a non-yrast four-quasiparticle isomer in 164 Er

164 Er 中非拉斯特四准粒子异构体的受阻衰变

• DOI: 10.1103/physrevc.86.044307
• 发表时间: 2012
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Swan T

Discovery of isomers in dysprosium, holmium, and erbium isotopes with N = 94 to 97

发现 N = 94 至 97 的镝、钬和铒同位素异构体

• DOI: 10.1103/physrevc.85.024313
• 发表时间: 2012
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Swan T

Discovery of highly excited long-lived isomers in neutron-rich hafnium and tantalum isotopes through direct mass measurements.

• DOI: 10.1103/physrevlett.105.172501
• 发表时间: 2010-10
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: M. Reed;I. Cullen;P. Walker;Y. Litvinov;K. Blaum;F. Bosch;C. Brandau;J. Carroll;D. Cullen-D.-Cull

Discovery of a nonyrast K p = 8 + isomer in Dy 162 , and the influence of competing K -mixing mechanisms on its highly forbidden decay

Dy 162 中非亚拉斯特K p = 8异构体的发现，以及竞争性K混合机制对其高度禁衰变的影响

• DOI: 10.1103/physrevc.83.034322
• 发表时间: 2011
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Swan T