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用67.4MeV~(12)C束轰击天然银靶,通过[HI,xn]反应生成缺中子同位素~(117～119)I,研究了其衰变特性。采用氦喷嘴传输技术与快速化学分离系统的组合,用溶剂萃取法从反冲产物中有效地将碘与“杂质”碲、锑等进行了分离。分离速度25-40秒。测得了~(117～119)I的16种较强γ谱线,与文献值符合较好:得到了~(117,118,119)I的部分衰变特性,达到了电荷指定的目的。此外,还测到了7个用直接物理法未测到的γ峰。其中4个峰目前尚未见文献报道,我们认为可能是碘峰。
The natural silver target was bombarded with 67.4MeV ~ (12) C and the missing isotope ~ (117 ~ 119) I was generated by [HI, xn] reaction. Using a combination of helium nozzle transport and a rapid chemical separation system, solvent extraction was used to effectively separate iodine from impurities such as tellurium and antimony from the recoil product. Separation speed 25-40 seconds. The 16 strong γ spectra of ~ (117-119) I were measured and found to be in good agreement with the published data. The partial decay properties of ~ (117,118,119) I were obtained and the charge assignment was achieved. In addition, seven γ-peaks that were not detected by the direct physical method were also measured. Four of these peaks have not been reported in the literature so far, and we think they may be iodine peaks.