Production cross-section of 230Ra in the reaction of 60 MeV/u 18O ions with 238U

A thick natural uranium target was bombarded with a 60 MeV/u ¹⁸O beam. The neutron-rich isotope ²³⁰Ra as the target residue was produced through the multinucleon transfer reaction(²³⁸U-4p-4n). The barium and radium fraction as BaCl₂ precipitate were radiochemically separated first from the mixture of uranium and reaction products. Then, the radium fraction was separated from BaCl₂ precipitate by using cation exchange technique. The γ-ray spectra of the Ra fraction were measured using an HPGe detector. The production cross sections of ²³⁰Ra were obtained by a combination of the radiochemical separation technique and off-line γ-ray spectroscopy. The cross section of ²³⁰Ra has been determined to be 66±20 μb.     

60 MeV/u18O与232Th反应的Ba同位素产生截面

60MeV/u18O离子与232Th反应产生放射性Ba同位素。通过3次BaCl2沉淀,将Ba从大量的Th和其他反应产物混合物中分离出来。使用离线!谱学方法完成Ba样品!活性的测量。根据各个Ba同位素的特征!射线峰的活度和其他相关数据,得到Ba同位素的产生截面。     

重核的多核子转移反应和冷碎裂反应

扼要介绍重核的多核子转移反应和冷碎裂反应,指出它们是产生重质量丰中子未知核素的有效途径。