Beta-decay study on high energy excited levels in nuclei far off stability line with energy-sum gamma-ray spectroscopy.

利用通孔型HPGe探测器和三叶草Ge探测器，研究了远离B稳定线的高能激发态的衰变方案。这些探测器具有高立体角和高探测效率，然后，去激励。具有级联关系的射线可以被检测为符合求和峰。这意味着观察到的和峰对应于激发态的能量。这些是识别高能量水平的有用工具。此外，还提出了一种三叶草探测器符合求和的校正方法。在100 keV ~ 3 MeV范围内，射线强度的测定精度约为5%。用该探测器测量了用在线质量分离器KUR-ISOL从235 U热中子裂变产物中分离出来的丰中子核147 La衰变中的γ射线。56个激发能级和160个。子核147 Ce中的X射线被新鉴定为3. 5兆电子伏。

With a through-hole type HPGe detector and a clover Ge detector, decay schemes including high energy excited states of nuclei far off the b stability line were studied. These detectors have high solid angle and high detection efficiency, then, de-excite.-rays with cascade relation can be detected as a coincidence summing peak. It means the observed sum peaks correspond to energy of the excited states. Those are useful tools for identify high energy levels. In addition, a correction method for coincidence summing in the clover detector were also developed, the.-ray intensities could be determined with the accuracy of 5%, approximately, from 100 keV to 3 MeV.On the other hand,.-rays in the decay of neutron-rich nucleus 147La, which were separated by the on-line mass separator KUR-ISOL from fission products of 235U with thermal neutron, were measured with the detector. The 56 excited levels and 160.-rays in the daughter nucleus 147Ce were newly identified up to 3. 5 MeV.