Production of Element-106, Seaborgium, isotopes to apply for chemical research

原子序数Z>103的超重元素的化学性质研究是现代核化学和放射化学领域中非常有趣和具有挑战性的课题;这些元素的化学表征探索了元素周期表第7周期元素的新前沿。然而，这些实验中的一些显示出相互矛盾的结果，而另一些则由于不满意的实验条件而受到批评，因为严格限制的实验条件在原子的时间基础上。因此，获得具有良好统计特性的准确结果对表征这些元素的化学性质具有重要意义。为了研究Sg的化学性质，需要通过重离子核反应产生长寿命同位素^&lt;265，266&gt;Sg，^<248>Cm+ ^<22>Ne。然而，在日本仅报道超重元素化学研究的JAEA串列加速器中很难产生^&lt;265，266&gt;Sg同位素，因为用于气体喷射靶系统的安装的真空窗口不能稳定地用于交叉产生的^ Ne锐化束<22>。在这个计划中，一个新的光束摆动系统和一个高流量的氦冷却系统的气体喷射真空窗口安装在照射束线在日本原子能机构串列加速器。经过这些改进，束流形状得到了成功的展开。在<19>3天的时间里，μ F光束稳定可用，强度增加到我们以前实验的三倍。最近，为了提高~（40）<19>F和~<22>（40）Ne的束流强度，在加速器中安装了一个新的ECR离子源（14 GHz）。在不久的将来，^<22>Ne束将用于化学研究中的Sg同位素生产。

Studies on chemical properties of the superheavy elements with atomic numbers Z>103 are extremely interesting and challenging subjects in the fields of modern nuclear and radiochemistry; chemical characterization of these elements explores the new frontiers of the elements in the 7th period of the Periodic Table. However, some of these experiments show conflicting results and some others are criticized due to unsatisfactory experimental conditions because of the strict restricted experimental conditions on an atom-at-a-time basis. Therefore, it is of great importance to obtain accurate results with good statistics to characterize chemical properties of those elements. To investigate the chemical properties of Sg, the long-life isotope, ^<265,266>Sg, is needed to produce by heavy-ion nuclear reaction, ^<248>Cm+ ^<22>Ne. However, it is difficult to produce ^<265,266>Sg isotopes in the JAEA tandem accelerator which facility was only reported the chemical studies of the superheavy element in Japan, since a installed vacuum window for a gas-jet target system will not stably use for crossing generated sharpen beams of ^<22>Ne. In this program, a new beam wobbling system and a high flow rate He-cooling system for the gas-jet vacuum window were installed in the irradiation beam line at the JAEA tandem accelerator. After these improvements, the beam shape was successfully spread out. The ^<19>F-beam was stably available during 3 days and the intensity was increased for three times as much as our previous experiments. Recently, in order to increase the ^<19>F and ^<22>Ne beam intensities, a new ECR ion-source (14 GHz) was installed in the accelerator. In the near future, ^<22>Ne beam will be used the Sg isotopes production for the chemical studies.