Zamboni C B, Medeiro J A, Lapolli A L, Genezini F A, Camargo S P, da Cruz M T, Zevallos-Chávez J Y
Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, São Paulo, Brazil.
Appl Radiat Isot. 2001 Oct;55(4):477-83. doi: 10.1016/s0969-8043(01)00105-1.
The gamma-ray spectrum of 139La following the beta- decay of 139Ba has been studied using both singles and gammagamma coincidence spectroscopy techniques. The energies and intensities of 30 gamma-transitions have been determined, which include three new transitions placed in the level scheme. Two new levels at 1524.6 and 1900.3 keV excitation energies are proposed and a number of gamma-transitions have been confirmed. On the basis of these results a precise decay scheme is proposed.
利用单谱和γγ符合光谱技术研究了¹³⁹Baβ衰变后¹³⁹La的γ射线谱。已确定了30个γ跃迁的能量和强度，其中包括能级图中的三个新跃迁。提出了激发能为1524.6和1900.3 keV的两个新能级，并确认了一些γ跃迁。基于这些结果，提出了一个精确的衰变图。
