论文标题
$ t_ {z} = -2 $ $ fp $ -shell nuclei $^{40} $ ti，$^{44} $ cr，$^{46} $ mn，$^{48} $ fe，$^{48} $ fe，$^{48} $ fe，$^{50} $ co and $^{52} $ co and $^{52} $ ni
Mass measurements for $T_{z}=-2$ $fp$-shell nuclei $^{40}$Ti, $^{44}$Cr, $^{46}$Mn, $^{48}$Fe, $^{50}$Co and $^{52}$Ni
论文作者
论文摘要
通过在实验性凉爽的储物环CSRE上使用等质的质谱（IMS），大量短的$^{44} $ cr，$^{46} $ mn，$^{48} $ fe，$^{50} $ co和$^co co and $^{52} $ ni是$ ni ti the precy的$^$^$^$^$ a大约2。已经实现了$Δm/m =（1-2）\ times $ 10 $^{ - 6} $的相对精度。描述了测量和数据分析的详细信息。将获得的质量与原子质量评估2016（AME $^{\ Prime} $ 16）和理论模型预测进行了比较。新的质量数据使我们能够提取$ fp $ -shell isospin五重奏组的Quartic多重质量方程（IMME）的高阶系数，$ d $和$ e $。出乎意料的是$ d $ - 和$ e $ - $ a = 44 $五重奏。通过重新介绍从$^{44} $ cr衰减的$β$删除质子的实验数据，建议观察到的异常可能是由于$ t = 2 $，$ j^π= 0^{+} {+} $ j = 0^{+} $ iSobaricAniog state（ias）in $^{44} $ v。
By using isochronous mass spectrometry (IMS) at the experimental cooler storage ring CSRe, masses of short-lived $^{44}$Cr, $^{46}$Mn, $^{48}$Fe, $^{50}$Co and $^{52}$Ni were measured for the first time and the precision of the mass of $^{40}$Ti was improved by a factor of about 2. Relative precisions of $δm/m=(1-2)\times$10$^{-6}$ have been achieved. Details of the measurements and data analysis are described. The obtained masses are compared with the Atomic-Mass Evaluation 2016 (AME$^{\prime}$16) and with theoretical model predictions. The new mass data enable us to extract the higher order coefficients, $d$ and $e$, of the quartic form of the isobaric multiplet mass equation (IMME) for the $fp$-shell isospin quintets. Unexpectedly large $d$- and $e$-values for $A=44$ quintet are found. By re-visiting the previous experimental data on $β$-delayed protons from $^{44}$Cr decay, it is suggested that the observed anomaly could be due to the misidentification of the $T=2$, $J^π=0^{+}$ isobaric analog state (IAS) in $^{44}$V.
