Direct search for primordial ^(244)Pu in Bayan Obo bastnaesite  

作　　者：Yang Wu Xiongxin Dai Shan Xing Maoyi Luo Marcus Christl Hans-Arno Synal Shaochun Hou 

机构地区：[1]China Institute for Radiation Protection,Taiyuan 030006,China [2]Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions,Suzhou 215006,China [3]Laboratory of Ion Beam Physics,ETH Zurich,Zurich 8093,Switzerland [4]Baotou Research Institute of Rare Earths,Baotou 014030,China

出　　处：《Chinese Chemical Letters》2022年第7期3522-3526,共5页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 11675150, 12005197 and 12175201)。

摘　　要：The abundances of heavy elements produced in r-process nucleosynthesis in the early solar system need experimental verification.^(244)Pu could be the heaviest primordial nuclide produced before the formation of the Earth still being detectable today.As recent attempts failed to confirm the discovery of ^(244)Pu signals at a concentration of 1.0×10^(-18)g/g in bastnaesite reported by Hoffman et al.in this study,the total primordial ^(244)Pu in 450 g bastnaesite sample from Bayan Obo ore (China) was measured using ultrasensitive compact accelerator mass spectrometry (AMS).As no ^(244)Pu signal was detected,an upper limit for the ^(244)Pu in our bastnaesite sample was estimated to be 2.1×10^(-20)g/g at 99%confidence level.

关 键 词：^(244)Pu Initial abundance ratio of^(244)Pu/^(238)U AMS measurement Pu radiochemistry analysis BASTNAESITE 

分 类 号：P618.92[天文地球—矿床学]