论文标题

$^{44} $ v的异构体和基态的高精度质量测量:改善对a = 44,$ \ text {0}^{\ text {\ text {+}} $ quintet的IMME参数的约束

High precision mass measurements of the isomeric and ground states of $^{44}$V: improving constraints on the IMME parameters of the A=44, $\text{0}^{\text{+}}$ quintet

论文作者

Puentes, D., Bollen, G., Brodeur, M., Eibach, M., Gulyuz, K., Hamaker, A., Izzo, C., Lenzi, S. M., MacCormick, M., Redshaw, M., Ringle, R., Sandler, R., Schwarz, S., Schury, P., Smirnova, N. A., Surbrook, J., Valverde, A. A., Villari, A. C. C., Yandow, I. T.

论文摘要

同型多重质量方程(IMME)在同一多重组中的同等类似物状态的质量已成功,而已知其系数遵循趋势作为质量数的函数。原子量评估2016 [Chin。物理。 C 41,030003(2017)] $^{44} $ v质量值导致$ c $ c $ c $ c $ c $ c $ c $ c $ c $系数。 $ b $和$ c $系数可以为$ pf $ shell的Isospin-nonconserving(INC)Hamiltonians的构建提供限制。 $ 0^+,t = 2 $ pluve $^{44} $ v的激发能量目前未知,可用于约束$^{44} $ cr质量。该实验的目的是进行高精度质量测量,以解决$^{44} $ V ISOMERIC和基态之间的差异,测试IMME,并提供用于识别$ 0^+$,$ t = 2 $ state in $^{44} $ v的成分。在Lebit上进行了高精度笔陷阱质谱法,以测量[$^{44G,M} $^+$^+$ vos [$^{32} $ SCO] $^+$的回旋频率比,参考质量,以提取$^$^{44} $ v。 $^{44} $ V中的地面和异构状态的质量过剩为$ -23 \ 804.9(80)$ kev/$ kev/$ \ text {c}^2 $和$ -23 \ 537.0(55)$ kev/$ kev/$ kev/$ \ text {c}^2 $。这产生了$ s_p $ = 1 \ 773(10)keV的新质子分离能。 $^{44} $ V的新质量值已用于推断出最低$ 2^+$的Imme $ b $和$ c $的系数,$ a = 44 $。 $ 2^+$ $ $ c $系数通过IMME趋势验证,并同意使用依赖电荷的汉密尔顿人进行的壳牌模型预测。镜子能量差异是在$^{44} $ v和$^{44} $ sc之间确定的,这与isospin-Memetry一致。确定的质子分离能的新值对于确定$ 0^+$,$ t = 2 $状态在$^{44} $ v和预测$^{44} $ CR的预测至关重要。

The Isobaric Multiplet Mass Equation (IMME) has been successful at predicting the masses of isobaric analogue states in the same multiplet, while its coefficients are known to follow trends as functions of mass number. The Atomic Mass Evaluation 2016 [Chin. Phys. C 41, 030003 (2017)] $^{44}$V mass value results in an negative $c$ coefficient for the IMME quadratic term. The $b$ and $c$ coefficients can provide constraints for construction of the isospin-nonconserving (INC) Hamiltonians for the $pf$ shell. The excitation energy of the $0^+, T=2$ level in $^{44}$V is currently unknown and can be used to constrain the $^{44}$Cr mass. The aim of the experiment was to perform high-precision mass measurements to resolve the difference between $^{44}$V isomeric and ground states, to test the IMME, and to provide ingredients for identifying the $0^+$, $T=2$ state in $^{44}$V. High-precision Penning trap mass spectrometry was performed at LEBIT, to measure the cyclotron frequency ratios of [$^{44g,m}$VO]$^+$ versus [$^{32}$SCO]$^+$, a reference mass, to extract both the isomeric and ground state masses of $^{44}$V. The mass excess of the ground and isomeric states in $^{44}$V were measured to be $-23\ 804.9(80)$ keV/$\text{c}^2$ and $-23\ 537.0(55)$ keV/$\text{c}^2$. This yielded a new proton separation energy of $S_p$ = 1\ 773(10) keV. The new mass values of $^{44}$V have been used to deduce the IMME $b$ and $c$ coefficients of the lowest $2^+$ and $6^+$ triplets in $A=44$. The $2^+$ $c$ coefficient is verified with the IMME trend and agrees with the shell-model predictions using charge-dependent Hamiltonians. The mirror energy differences were determined between $^{44}$V and $^{44}$Sc, in line with isospin-symmetry. The new value of the proton separation energy determined will be important for the determination of the $0^+$, $T=2$ state in $^{44}$V and for prediction of the mass of $^{44}$Cr.

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