^(134)Ba能级结构的在束γ谱学研究

In-beam γ-Ray Spectroscopy of Level Structure in ^(134)Ba

利用在束γ谱学技术 ,通过 12 8Te(10 B ,1p3n) 13 4 Ba反应研究了 13 4 Ba的中、高自旋激发态 .实验中采用 9套BGO(AC)HPGe探测器进行了γ γ t符合测量 .基于γ γ符合关系、γ射线的相对强度和各向异性度的测量结果建立了 13 4 Ba的能级纲图 .比较N =78的同中子素链的负宇称能级结构的系统性 ,发现激发能位于 4 14 2keV ,Jπ 值为 11-的能级很可能是与 13

Excited states of 134Ba, populated up to medium and high spins via the heavy-ion induced 128Te( 10B, 1p3n) 134Ba reaction at 46 MeV beam energy, have been studied using in-beam γ-ray spectroscopy techniques. Nine anti-Compton HPGe detectors were employed for the measurements of γ-γ-t coincidences. Based on the results of the γ-γ coincidence relationships, relative intensities and ADO ratios, a level scheme of 134Ba has been established. Comparing with the systemic features of the negative bands of N=78 isotones, the 11 - state at the excitation energy of 4142keV, is analogous to the one in 136Ce.