Precision Tests of the Nuclear Wavefunction using Exotic Beams: Measurements of shape co-existence in 182,184Hg using Coulomb excitation

使用奇异光束精确测试核波函数：使用库仑激发测量 182,184Hg 中的形状共存

• 批准号: PP/F000898/1
• 负责人: Peter Butler
• 金额: $ 22.19万
• 依托单位: University of Liverpool
• 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=PP%2FF000898%2F1
• 关键词: Precision; Tests; Nuclear; Wavefunction; using

At the ISOLDE facility, part of the international CERN Laboratory in Geneva, Switzerland, radioactive nuclei are produced with high intensities in the so-called isotope separation on-line (ISOL) technique where a primary target is bombarded with an intense, high energy proton beam. Using different primary targets, ISOLDE can produce beams of varying intensity of over 700 isotopes of 70 different chemical elements. This facility is unique worldwide in the diversity of available beams which it can produce. A recent advance at ISOLDE has been the REX-ISOLDE facility which accelerates these radioactive nuclei to energies where they start to resist the Coulomb repulsion of other nuclei in a fixed target. At such energies, interactions take place which allow us to probe the structure of these exotic radioactive nuclei with high precision. For one of these mechanisms, Coulomb excitation, some of the energy of the interaction goes into exciting the nucleus into higher energy states. The ease with which this takes place reflects the nuclear collectivity, a property which is generally largest for nuclei which are deformed, typically having a non-spherical shape such as a rugby-ball shape. Coulomb-excitation measurements therefore allow us to study the nuclear shape, in particular, a certain special class of nuclei which exhibit shape coexistence. This phenomenon occurs when different states in a particular isotope have different distinct shapes.

在位于瑞士日内瓦的欧洲核子研究中心国际实验室的一部分ISOLDE设施，以所谓的同位素分离在线技术产生高强度的放射性核，该技术用强高能质子束轰击主要靶。ISOLDE使用不同的主要目标，可以产生70种不同化学元素的700多种同位素的不同强度的光束。该设施在全球范围内独一无二，可以生产多种可用光束。ISOLDE最近的一个进展是REX-ISOLDE设施，它将这些放射性核加速到它们开始抵抗固定目标中其他核的库仑排斥的能量。在这样的能量下，相互作用的发生使我们能够以高精度探测这些奇异放射性核的结构。对于这些机制之一，库仑激发，一些相互作用的能量进入激发原子核进入更高的能量状态。这发生的容易程度反映了核集体性，这是一种对于变形的核通常最大的性质，通常具有非球形形状，例如橄榄球形状。因此，库仑激发测量使我们能够研究核的形状，特别是某些特殊类别的核，表现出形状共存。当特定同位素的不同状态具有不同的独特形状时，就会发生这种现象。

项目成果

Electromagnetic properties of low-lying states in neutron-deficient Hg isotopes: Coulomb excitation of 182Hg, 184Hg, 186Hg and 188Hg

• DOI: 10.1140/epja/i2019-12815-2
• 发表时间: 2019-08
• 期刊: The European Physical Journal A
• 作者: K. Wrzosek-Lipska;K. Wrzosek-Lipska;K. Rezynkina;K. Rezynkina;N. Bree;M. Zielińska;M. Zielińska;L. Gaffney;A. Petts;A. Andreyev;A. Andreyev;B. Bastin;B. Bastin;M. Bender;A. Blazhev;B. Bruyneel;P. Butler;M. Carpenter;J. Cederkäll;J. Cederkäll;E. Clément;E. Clément;T. Cocolios;T. Cocolios;T. Cocolios;A. Deacon;J. Diriken;A. Ekström;C. Fitzpatrick;L. Fraile;C. Fransen;S. Freeman;J. García-Ramos;K. Geibel;R. Gernhäuser;T. Grahn;T. Grahn;M. Guttormsen;B. Hadinia;B. Hadinia;K. Hadyńska-Klęk;M. Hass;P. Heenen;R. Herzberg;H. Hess;K. Heyde;M. Huyse;O. Ivanov;D. Jenkins;R. Julin;N. Kesteloot;T. Kröll;R. Krücken;A. Larsen;R. Lutter;P. Marley;P. Napiorkowski;R. Orlandi;R. Orlandi;R. Page;J. Pakarinen;J. Pakarinen;N. Patronis;N. Patronis;P. Peura;E. Piselli;L. Prochniak;P. Rahkila;E. Rapisarda;P. Reiter;AP Robinson;AP Robinson;M. Scheck;M. Scheck;S. Siem;K. S. Chakkal;J. Smith;J. Srebrny;I. Stefanescu;I. Stefanescu;G. Tveten;P. Duppen;J. V. D. Walle;D. Voulot;N. Warr;A. Wiens;J. Wood