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

原子序数为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；这些元素的化学特性探索了元素周期表第七周期元素的新领域。然而，其中一些实验显示出相互矛盾的结果，另一些实验由于严格限制原子一次的实验条件而受到批评，因为实验条件不令人满意。因此，获得具有良好统计性能的准确结果来表征这些元素的化学性质是非常重要的。为了研究Sg的化学性质，需要重离子核反应产生长寿命同位素^<265,266>Sg, ^<248>Cm+ ^<22>Ne。然而，由于安装的气体喷射靶系统的真空窗不能稳定地用于交叉产生的^<22>Ne的尖利光束，因此很难在JAEA串联加速器中产生^<265,266>Sg同位素，该设备仅在日本报道了超重元素的化学研究。在该方案中，在JAEA串联加速器的辐照束流线上安装了新的束流摆振系统和气体喷射真空窗的高流量he冷却系统。经过这些改进，梁的形状得以成功展开。^<19>的f束在3天内稳定可用，强度增加了3倍。最近，为了提高^<19>F束和^<22>Ne束的强度，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Sg同位素生产的化学研究。

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.