铪的新同位素:^(186)Hf

A New Isotope of Hafnium: ^(186)Hf

利用兰州重离子加速器提供的60MeV／u的（18）O离子束轰击天然钨靶，通过奇异的多核子转移反应生成（186）Hf．采用快速放射化学分离技术从钨及反应产物的混合物中分离出铪，由高纯锗（HPGe）探测器测量样品的γ活性，观测到了（186）Hf的子体（186）Taγ活性的生长、衰变行为．由此表明：本实验首次合成并鉴别了重丰中子新核素（186）Hf，并测定它的半衰期为（2．6±1．2）min．

60MeV /u(18)O ion beam delivered by the Heavy Ion Research Facility in Lanzhou (HIRFL) bombarded the natural tungsten targets. The (186)Hf was produced by multinucleon transfer reacions. The hafnium fraction was separated radiochemically from the mixture of tungsten and the reaction products. The γ activity was measured with a HPGe detector. The growth and decay of (186)Ta γ-rays has been observed, which indicates the （186）Hf as a parent of （186）Ta were produced. The half-life of （186）Hf has been determined to be (2.6±1.2)min.