Decay Spectroscopy of Exotic Nuclei at FAIR

FAIR 中奇异核的衰变光谱

• 批准号: EP/E004385/1
• 负责人: Robert Page
• 金额: $ 71.1万
• 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=EP%2FE004385%2F1
• 关键词: Decay; Spectroscopy; Exotic; Nuclei; FAIR

It is an astonishing fact that most of the chemical elements we observe today were created from the ashes of ancient stellar explosions. The most spectacular events of this type are supernovae. With very high sensitivity modern telescopes we can study the chemical abundances of material ejected from distant supernovae and compare these abundances with those found in our own solar system. Understanding these abundances turns out to crucially depend on nuclear reaction processes. Stars can be thought of as naturally occurring nuclear reactors held together by gravity. Fortunately for us the sun is not currently in an explosive phase of development. However, most of the elements now present in the solar system were in fact produced in earlier generations of exploding stars. In this sense, we can think of ourselves as cosmic debris. The reaction processes in exploding stars are very different to those found in the sun, and involve nuclear species never seen before on our planet. Rather like chemicals that behave very differently according to their electronic shell structure - sodium is highly reactive with water but neon with one less electron is an inert gas - nuclear species can either be very stable or very reactive according to their precise composition of protons and neutrons. Reactions involving these previously unobserved nuclear species are responsible for the chemical abundances we observe today, but until now we have had no chance to study them. The new FAIR accelerator being built in Germany is the only one in the world that can produce intense, high energy beams of the heaviest naturally occurring element, Uranium. This element itself will have been produced during ancient supernova explosions in a chain of nuclear reactions scientists call the r-process in which many neutrons are rapidly absorbed by a seed nucleus! Our experiments will reverse this process, and use advanced separation and detector equipment to observe new exotic nuclear species produced

令人惊讶的事实是，我们今天观察到的大多数化学元素都是由古代恒星爆炸的灰烬产生的。这种类型的最壮观事件是超新星。凭借非常高灵敏度的现代望远镜，我们可以研究从遥远的超新星弹出的材料的化学丰度，并将这些丰度与我们自己的太阳系中的丰度进行比较。了解这些丰度至关重要的是核反应过程。可以将恒星视为由重力固定在一起的天然核反应堆。对我们来说幸运的是，太阳目前还没有处于爆炸性的发展阶段。但是，现在太阳系中现在存在的大多数元素实际上是在早期爆炸恒星中产生的。从这个意义上讲，我们可以将自己视为宇宙碎片。爆炸恒星中的反应过程与在太阳中发现的反应过程大不相同，涉及我们地球上从未见过的核物种。就像根据其电子壳结构的行为非常不同的化学物质一样，钠对水具有高度反应性，但较少电子的霓虹灯是惰性气体 - 核种可能非常稳定，也可以根据其精确的质子和中子组成而具有反应性。涉及这些以前未观察到的核种的反应是我们今天观察到的化学丰度的原因，但是到目前为止，我们还没有机会研究它们。在德国建造的新公平加速器是世界上唯一可以产生最重的天然元素铀的强烈，高能光束的人。该元素本身将是在古代超新星爆炸过程中产生的，科学家称之为R过程，其中许多中子被种子核迅速吸收！我们的实验将扭转这一过程，并使用高级分离和检测器设备观察产生的新的外来核种类

项目成果

Competing Decay Modes of a High-spin Isomer in the Proton-unbound Nucleus $^{158}$Ta

质子非束缚核中高自旋异构体的竞争衰变模式 $^{158}$Ta

• DOI: 10.5506/aphyspolb.46.695
• 发表时间: 2015
• 期刊: Acta Physica Polonica B
• 影响因子: 0.5
• 作者: Carroll R

Blurring the boundaries: decays of multiparticle isomers at the proton drip line.

• DOI: 10.1103/physrevlett.112.092501
• 发表时间: 2014-03
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: R. Carroll;R. Page;D. Joss;J. Uusitalo;I. Darby;K. Andgren;B. Cederwall;S. Eeckhaudt;T. Grahn;C. Gray-Jones;P. Greenlees;B. Hadinia;P. Jones;R. Julin;S. Juutinen;M. Leino;A. Leppänen;M. Nyman;D. O’Donnell;J. Pakarinen;P. Rahkila;M. Sandzelius;J. Sarén;C. Scholey;D. Seweryniak;J. Simpson

Shape coexistence in the neutron-deficient even-even (182-188)Hg isotopes studied via coulomb excitation.

通过库仑激发研究了缺中子偶-偶 (182-188)Hg 同位素的形状共存。

• DOI: 10.1103/physrevlett.112.162701
• 发表时间: 2014
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: Bree N

AIDA: A 16-channel amplifier ASIC to read out the advanced implantation detector array for experiments in nuclear decay spectroscopy

AIDA：16 通道放大器 ASIC，用于读出用于核衰变光谱实验的先进注入探测器阵列

• DOI: 10.1109/nssmic.2009.5402153
• 发表时间: 2009
• 作者: Braga D

Multiparticle configurations of excited states in Lu 155

Lu 155 激发态的多粒子构型

• DOI: 10.1103/physrevc.94.064311
• 发表时间: 2016
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Carroll R