论文标题
$^{112,113} $ ag和$^{115} $ CD的精确Q值测量带有加拿大笔陷阱，以评估潜在的超低Q值$β$ - 订单
Precise Q value measurements of $^{112,113}$Ag and $^{115}$Cd with the Canadian Penning trap for evaluation of potential ultra-low Q value $β$-decays
论文作者
论文摘要
从母体核素到女儿的激发状态$ q_ {ul} $ <1 keV，可能会发生超低Q值$β$ -Decay。这些衰减对于核$β$ - 二年级理论和中微子质量确定实验中的潜在候选者来说是感兴趣的。迄今为止，已经观察到仅观察到一个超低Q值$β$ -Decay- $^{115} $ in，$q_β$ = 147（10）ev。存在许多其他潜在的候选者，但是需要改进的质量测量以确定是否允许衰减，实际上是超低的。我们执行了$^{112,113} $ ag和$^{115} $ C的精确$β$ -Decay Q值测量值，并将它们与女儿同位素的核能水平数据结合在一起，以确定潜在的UL Q值$β$ -Decay分支是否$^{112,113} $ ag and $^agg and $^和$^和$^和$^115 poct and cd。使用ANL的加拿大笔陷阱用于测量单一收费$^{112,113} $ ag和$^{115} $ cd ions相对于女儿的回旋频率比。从这些测量值中，获得了基态$β$ -Decay Q值。 $^{112} $ ag，$^{113} $ ag和$^{115} $ cd $β$ -decay Q值的测量分别为3990.16（22）KeV，2085.7（4.6）KeV，和1451.36（34）Kev。将这些结果与$^{112} $ C的激发状态的能量进行比较，在3997.75（14）kev，$^{113} $ cd at 2015.6（2.5）和2080（10）kev，$^{115 {115} $ in 1448.787（9）kev，$ q _ _ = -7.59（26）Kev，6（11）KeV和2.57（34）Kev。 $^{112} $ ag和$^{115} $ cd的潜在UL Q值衰减已被排除在外。 $^{113} $ ag仍然是可能的候选人，直到对2080（10）Kev，1/2 $^{+} $ state of $^{113} $ cd进行更精确的测量。在这项工作的过程中，我们发现$^{113} $ ag的基质量在2020年份报告的基础质量低于我们的测量值69（17）Kev（A 4 $σ$差异）。
An ultra-low Q value $β$-decay can occur from a parent nuclide to an excited state in the daughter with $Q_{UL}$ <1 keV. These decays are of interest for nuclear $β$-decay theory and as potential candidates in neutrino mass determination experiments. To date, only one ultra-low Q value $β$-decay has been observed -- that of $^{115}$In with $Q_β$ = 147(10) eV. A number of other potential candidates exist, but improved mass measurements are necessary to determine if the decays are energetically allowed and, in fact, ultra-low. We performed precise $β$-decay Q value measurements of $^{112,113}$Ag and $^{115}$Cd and combined them with nuclear energy level data for the daughter isotopes to determine if the potential UL Q value $β$-decay branches of $^{112,113}$Ag and $^{115}$Cd are energetically allowed and <1 keV. The Canadian Penning Trap at ANL was used to measure the cyclotron frequency ratios of singly-charged $^{112,113}$Ag and $^{115}$Cd ions with respect to their daughters. From these measurements, the ground-state $β$-decay Q values were obtained. The $^{112}$Ag, $^{113}$Ag, and $^{115}$Cd $β$-decay Q values were measured to be 3990.16(22) keV, 2085.7(4.6) keV, and 1451.36(34) keV, respectively. These results were compared to energies of excited states in $^{112}$Cd at 3997.75(14) keV, $^{113}$Cd at 2015.6(2.5) and 2080(10) keV, and $^{115}$In at 1448.787(9) keV, resulting in $Q_{\textrm{UL}}$ values of --7.59(26) keV, 6(11) keV, and 2.57(34) keV, respectively. The potential UL Q value decays of $^{112}$Ag and $^{115}$Cd have been ruled out. $^{113}$Ag is still a possible candidate until a more precise measurement of the 2080(10) keV, 1/2$^{+}$ state of $^{113}$Cd is available. In the course of this work we have found the ground state mass of $^{113}$Ag reported in the 2020AME to be lower than our measurement by 69(17) keV (a 4$σ$ discrepancy).
