How elements up to 118 were reached and how to go beyond
How elements up to 118 were reached and how to go beyond
复制标题
如何达到 118 以内的元素以及如何超越
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
C. Düllmann
中科院分区：
文献类型：
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作者：
C. Düllmann
Z=113、115、117和118的新超重元素最近被纳入元素周期表并被命名。Z≥112的元素主要在48个ca诱导的锕系元素靶上的聚变反应中产生。由于缺乏质子数足够高的靶材料来到达Z≥119的元素，该途径在Z=118时耗尽。在GSI达姆施塔特和FLNR杜布纳进行了寻找更重元素的实验。研究了50 Ti + 249 Bk的反应，得到Z=119, 64 Ni + 238 U, 58 Fe + 244 Pu， 54 Cr + 248 Cm和50 Ti + 249 Cf的反应，得到Z=120。尽管这些实验总共持续了一年多，但都没有成功地发现一种新元素。为了更好地指导搜索实验，核反应研究似乎是必要的，而且最近已经开始了。此外，技术进步将是实现这一目标的重要支柱。在GSI，一种新的连续波线性加速器的工作正在进行中，并简要介绍。
The new superheavy elements with Z=113, 115, 117, and 118 were recently accepted into the periodic table and have been named. Elements with Z≥112 are predominantly produced in 48 Ca-induced fusion reactions on actinide targets. This pathway is exhausted at Z=118 due to the lack of target materials with sufficiently high proton number to reach elements with Z≥119. Search experiments for yet heavier elements were performed at GSI Darmstadt and FLNR Dubna. The reactions 50 Ti + 249 Bk, which leads to Z=119, as well as 64 Ni + 238 U, 58 Fe + 244 Pu, 54 Cr + 248 Cm, and 50 Ti + 249 Cf, leading to Z=120, have been studied. Despite a total duration of these experiments of more than one year, neither succeeded in the identification of a new element. To obtain improved guidance for better-informed search experiments, nuclear reaction studies appear necessary and have recently started. Also technical advances will be an important pillar to this end. At GSI, work towards a new continuous-wave linear accelerator is ongoing and is briefly described.
影响因子：
64.8
作者：
Block, M.;Ackermann, D.;Weber, C.
通讯作者：
Weber, C.