新丰中子核素￣（185）Hf的研究I．合成、分离和鉴别

Abstract

用（ｎ，２ｐ）反应和快化分离法首次合成和鉴别了新丰中子同位素￣（１８５）Ｈｆ。其半衰期为３．５±０．６ｍｉｎ。另外，还观察到一条能量为１６４．５±０．５ｋｅＶ、半衰期为４．３±０．９ｍｉｎ的属于￣（１８５）Ｈｆ衰变的γ射线。An unreported Hafnium isotope￣185Hf has been identified for first time.Sources of￣185Hfprepared by 14 MeV neutron irradiation of tungsten followed by radiochemical separation have been studied. The new activity is identified by following the time variation of the γ-rays. The half-life of￣185Hf has been determined to be 3.5±0.6min. In addition,a new 164.5±0.5keV γ-ray is found and assigned to￣185Hf based on the rneasurements of transition enertgy and half-life.中国科学院八五重大项目资