This work presents the nuclear level scheme (NLS) of ¹⁶⁴Dy nucleus obtained from the ¹⁶³Dy(n${}_{th}$,2γ) experiment. The latter has used a $\gamma -\gamma$ coincidence spectrometer to measure the two-step gamma cascades corresponding to the decays from the compound state to 9 low-lying states of ¹⁶⁴Dy, whose energies are 0.0, 73.393, 242.234, 761.815, 828.215, 915.991, 976.916, 1039.309, and 1122.774 keV. Based on the measured data, the ¹⁶⁴Dy NLS, which consists of 64 primary gamma transitions and their corresponding intermediate levels, together with 132 secondary gamma transitions, has been constructed. Among these data, 20 primary gamma transitions, 51 intermediate levels, and 63 secondary gamma transitions are found to be the same as those currently exist in the Evaluated Nuclear Structure Data File (ENSDF) database. The remain data, which include 44 primary transitions, 13 intermediate levels, and 69 secondary transitions, are therefore, considered as an update for the NLS of ¹⁶⁴Dy. In particular, the spin values of 57 observed intermediate levels have been tentatively assigned by means of transition rules. Furthermore, the influence of the present experimental data on the study of the nuclear level density and radiative strength function is also discussed.

这项工作提出了从¹⁶³ Dy（n）获得的¹⁶⁴ Dy核的核能级方案（NLS）${}_{ŤH}$，2γ）实验。后者使用了$\gamma -\gamma$巧合谱仪测量与从复合态到¹⁶⁴ Dy的9个低洼状态的衰变相对应的两步伽玛级联，其能量为0.0、73.393、242.234、761.815、828.215、915.991、976.916、1039.309和1122.774 keV 。根据实测数据，¹⁶⁴Dy NLS由64个一级伽马跃迁及其相应的中间能级以及132个二级伽马跃迁组成。在这些数据中，发现20个一级伽玛跃迁，51个中间能级和63个次级伽玛跃迁与“评估的核结构数据文件”（ENSDF）数据库中当前存在的那些相同。因此，其余数据（包括44个主要转换，13个中间级别和69个辅助转换）被视为¹⁶⁴的NLS的更新镝。特别地，已经通过过渡规则临时分配了57个观察到的中间水平的自旋值。此外，还讨论了当前实验数据对核能级密度和辐射强度函数研究的影响。