发表机构
The Australian National University（澳大利亚国立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究重新评估54Cr的DSAM寿命，升级分析代码采用现代阻止本领，发现寿命增幅16%-27%，修正的E2跃迁率与壳模型计算吻合，还建议修正两个能级的自旋指定。
AI 中文摘要
背景：在钽中慢化的fp壳层核的现代阻止本领，与1963年Lindhard、Scharff和Schiøtt（LSS）理论[Mat. Fys. Medd. Dan. Vid. Selsk. 33 no. 14, (1963)]存在两倍差异，而该理论自20世纪70年代起就被用于多普勒移衰减法（DSAM）寿命测量。近期研究[Phys. Rev. C 113, 044306 (2026)]发现，文献[Nucl. Data Sheets 111, 897 (2010)]中58Fe的4⁺₁→2⁺₁跃迁存在异常高的集体性，可追溯至DSAM寿命测量中使用了这些历史阻止本领；当将阻止本领替换为最新值后，对Bolotin等人[Nucl. Phys. A 311, 75 (1978)]的测量结果重新分析，获得了与壳模型计算的满意一致性。目的：对同一研究组[Nucl. Phys. A 337, 1 (1980)]开展的54Cr的DSAM测量（采用相同实验方法与流程）进行重新检验。方法：重建并升级了原始DSAM分析所用的计算机代码，使其具备使用现代阻止本领的能力；将修正后寿命推导得到的E2跃迁强度与壳模型计算结果进行比较。结果：寿命增加了16%至27%，其中更大的增幅通常对应电子阻止占主导的较短寿命。结论：基于当前阻止本领的修正寿命，表明54Cr中直至6⁺₁态的各能级间E2跃迁率与壳模型计算结果吻合良好；寿命数据、分支比及壳模型计算强烈提示需修正3.786 MeV（当前为(4)⁺）和4.043 MeV（当前为5⁺）处能级的自旋，建议分别将其指定为5⁺₁和6⁺₂态。
英文摘要
Background: Contemporary stopping powers for fp-shell nuclei slowing in tantalum can differ by a factor of two from the 1963 Lindhard, Scharff and Schiøtt (LSS) theory [Mat. Fys. Medd. Dan. Vid. Selsk. 33 no. 14, (1963)] used in Doppler-shift attenuation method (DSAM) lifetime measurements dating back to the 1970s. In recent work [Phys. Rev. C 113, 044306 (2026)], it was found that anomalously high collectivity in the $4^+_1 \rightarrow 2^+_1$ transition of 58Fe given in the literature [Nucl. Data Sheets 111, 897 (2010)] could be traced back as due to the use of these historical stopping powers in the Doppler-shift lifetime measurements. Satisfactory agreement with shell-model calculations was obtained from a re-analysis of the measurement of Bolotin et al. [Nucl. Phys. A 311, 75 (1978)] once the stopping powers were replaced by up-to-date values. Purpose: The DSAM measurement on 54Cr by the same group [Nucl. Phys. A 337, 1 (1980)], which used the same experimental methods and procedures, is re-examined. Method: The computer code used in the original DSAM analysis has been rebuilt and upgraded with the capacity to use contemporary stopping powers. E2 transition strengths derived from the revised lifetimes are compared with shell-model calculations. Results: The lifetimes increase by 16% to 27%, with the larger increase generally corresponding to shorter lifetimes where electronic stopping dominates. Conclusions: Revised lifetimes, based on current stopping powers, imply E2 transition rates between states up to the 6$^+_1$ state in 54Cr that compare well with shell-model calculations. The lifetime data together with branching ratios and the shell-model calculations strongly suggest revision of the spins assigned to the levels at 3.786 (currently (4)$^+$) and 4.043 MeV (currently 5$^+$). These levels are suggested to be the 5$^+_1$ and 6$^+_2$ states, respectively.
Comments11 pages, 5 figures. To be published in Phys. Rev. C
