论文标题
通过异构体衰变揭示的187TA的性质
Properties of 187Ta revealed through isomeric decay
论文作者
论文摘要
在高自旋异构体状态下，质量分离的187TA是通过多核子转移反应首次产生的，该反应采用了氩气停止细胞和激光电离。内部伽马射线显示在1778 KEV处有7.3 S异构体，该异构体通过旋转带的旋转带衰减，其扰动与呈圆锥形形状的方法相关。与同一质量区域中较重的元素相比，模型计算的影响较小。异构体衰减减少了27个E2阻塞因子，这支持了轴向对称性大致保守的解释。
Mass-separated 187Ta in a high-spin isomeric state has been produced for the first time by multi-nucleon transfer reactions, employing an argon gas stopping cell and laser ionisation. Internal gamma rays revealed a 7.3 s isomer at 1778 keV, which decays through a rotational band with perturbations associated with the approach to a prolate-oblate shape transition. Model calculations show less influence from triaxiality compared to heavier elements in the same mass region. The isomer decay reduced E2 hindrance factor of 27 supports the interpretation that axial symmetry is approximately conserved.
