论文标题
高精度电子捕获$ q $ $^{111} $的价值测量值
High-precision electron-capture $Q$ value measurement of $^{111}$In for electron-neutrino mass determination
论文作者
论文摘要
使用双笔质量质谱仪Jyfltrap执行了$^{111} $ cd（$ 1/2^+$）$^{111} $ cd（$ 1/2^+$）$^{111} $ cd（$ 1/2^+$）$^{111} $ cd（$ 9/2^+$）对基$^{111} $的精确确定。获得了857.63（17）KEV的值，这比从2020年原子质量评估（AME2020）中提取的值高20倍。高精度电子捕获$ Q $值测量以及866.60（6）KeV，864.8（3）Kev，855.6（10）KeV和853.94（10）Kev和853.94（7）Kev for $^{111} $用于确定四个州是否可以通过$} $ Q $ q $ q $ q quate $ q quate $ q quate或电子捕获衰减。我们的结果证实，激动的状态为866.60（6）KEV，旋转式（$ j^π$）为3/2 $^{+} $和864.8（3）KeV，$ j^π$ = 3/2 $ = 3/2 $^{+} $由于其为Quapture $ Q $ Q $ Q $ Q $ Q $ Q $ quats而言，排除在50美元左右，因此被排除在外。电子捕获的衰减为853.94（7）kev（$ j^π$ = 7/2 $^+$）和855.6（10）Kev（$ j^π$ = 3/2 $^+$），分别为$ q $ $ q $ $ q $ $ q $值为3.69（19）（19）（19）kev and 2.0（10）kev。允许的衰减过渡$^{111} $ in（9/2 $^{+} $）$ \ rightarrow $ $ $^{111} $ cd（7/2 $^{+} $），$ Q $值为3.69（19）Kev，是Neprino-Mass Mass Mass Mass Ectiments的新候选者，可通过未来的EC进行新的候选技术，将未来的新候选人进行新的功能。结果表明，该衰减分支的im含量$ 2p_ {1/2} $导致能量区域对电子中微子质量敏感的EC事件数量显着增加。
A precise determination of the ground state $^{111}$In ($9/2^+$) electron capture to ground state of $^{111}$Cd ($1/2^+$) $Q$ value has been performed utilizing the double Penning trap mass spectrometer, JYFLTRAP. A value of 857.63(17) keV was obtained, which is nearly a factor of 20 more precise than the value extracted from the Atomic Mass Evaluation 2020 (AME2020). The high-precision electron-capture $Q$ value measurement along with the nuclear energy level data of 866.60(6) keV, 864.8(3) keV, 855.6(10) keV, and 853.94(7) keV for $^{111}$Cd was used to determine whether the four states are energetically allowed for a potential ultra-low $Q$-value $β^{}$ decay or electron-capture decay. Our results confirm that the excited states of 866.60(6) keV with spin-parity ($J^π$) of 3/2$^{+}$ and 864.8(3) keV with $J^π$ = 3/2$^{+}$ are ruled out due to their deduced electron-capture $Q$ value being smaller than 0 keV at the level of around 20$σ$ and 50$σ$, respectively. Electron-capture decays to the excited states at 853.94(7) keV ($J^π$ = 7/2$^+$) and 855.6(10) keV ($J^π$ = 3/2$^+$), are energetically allowed with $Q$ values of 3.69(19) keV and 2.0(10) keV, respectively. The allowed decay transition $^{111}$In (9/2$^{+}$) $\rightarrow$ $^{111}$Cd (7/2$^{+}$), with a $Q$ value of 3.69(19) keV, is a potential a new candidate for neutrino-mass measurements by future EC experiments featuring new powerful detection technologies. The results show that the indium level $2p_{1/2}$ for this decay branch leads to a significant increase in the number of EC events in the energy region sensitive to the electron neutrino mass.
