新同位素<SUP>265</SUP>Bh(Z=107)的合成证据

新同位素²⁶⁵Bh(Z=107)的合成证据

摘要: 利用兰州重离子加速器提供的26Mg离子束轰击243Am靶, 产生了新同位素265Bh. 实验中用氦喷技术对产物进行传输, 并用一套具有数对探测器组的转轮收集探测系统对产物进行收集和测量. 通过观测265Bh与它的衰变子核261Db及257Lr之间的α衰变的关联, 实现了对新核素的鉴别. 实验测得265Bh的α衰变能量为(9.24±0.05) MeV, 半衰期为0.94+0.70 –0.31 s.New isotope ~(265)Bh(Z=107) was produced in bombardment of an ~(243)Am target with 135 MeV ~(26)Mg ions at HIRFL. Identification was made by observation of correlated α-particle decays between the new isotope ~(265)Bh and its ~(261)Db and ~(257)Lr daughters with four pairs of detectors. The experimental results show that the half-life of ~(265)Bh is 0.94~(+0.70)_(-0.31) s and its α energy is (9.24±0.05) MeV.

Abstract: New isotope ~(265)Bh(Z=107) was produced in bombardment of an ~(243)Am target with 135 MeV ~(26)Mg ions at HIRFL. Identification was made by observation of correlated α-particle decays between the new isotope ~(265)Bh and its ~(261)Db and ~(257)Lr daughters with four pairs of detectors. The experimental results show that the half-life of ~(265)Bh is 0.94~(+0.70)_(-0.31) s and its α energy is (9.24±0.05) MeV.