论文标题
通过高精度质量测量值观察到超低$ q $ q $ q $ Q $ Q $ - 价值电子捕获通道腐烂到$^{75} $
Observation of an ultra-low $Q$-value electron-capture channel decaying to $^{75}$As via high-precision mass measurement
论文作者
论文摘要
使用双笔陷阱质谱仪Jyfltrap对原子量的$^{75} $的精确确定。质量过剩的测量为-73035.519（42）kev/c $^2 $，比最新的原子量质量评估（AME2020）中所采用的值更精确21个，而1.3（9）kev/c $^2 $低于所采用的值。该值已用于确定$^{75} $ se和$β^ - $β^ - $ decay $ q $ q $的$^{75} $ ge的$^{75} $ Q $ q $ q $ q $ q $ q $ q {75} $ ge的值，该值已用于确定该值，该值已用于确定该值的地面至地面电子胶囊衰减。使用860.00（40）KEV，865.40（50）KEV（电子捕获的最终状态）和1172.00（60）Kev（$β^ - $衰减的最终状态）的核能数据，用于$^{75} $的激发态，$^{75} $ as $^*$，我们已经确定了$^$ $ quath的$ q $ quattion $ qualtition $ qualtient $ Q^$ qualtient $ Q^$ Q^$ Q^$ Q^$ se $ Q^$ quttion $ se。 $ \ rightArrow $ $^{75} $ as $^*$和$^{75}的一个过渡$ ge $ \ rightArrow $ $ $^{75} $ as $^*$。地面到刺激的国家$ Q $值确定为6.04（41）KEV，0.64（51）KEV和6.56（60）KEV，因此证实了三个低$ Q $ $ Q $ - 价值过渡是有效的三个低$ q $ value过渡，其中一个都是有效的，并且可能是抗毒剂质量确定的候选渠道。此外，$^{75} $^{75} $ se $ \ rightarrow $ $ $^{75} $作为$^*$（865.40（50）keV）的过渡$^{75} $^{75} $^{75} $ q $ q $的价值被揭示为Ultra-low（<1 keV），并且是有史以来的Ec ec $ Q $ Q Q Qualtion。
A precise determination of the atomic mass of $^{75}$As has been performed utilizing the double Penning trap mass spectrometer, JYFLTRAP. The mass excess is measured to be -73035.519(42) keV/c$^2$, which is a factor of 21 more precise and 1.3(9) keV/c$^2$ lower than the adopted value in the newest Atomic Mass Evaluation (AME2020). This value has been used to determine the ground-state-to-ground-state electron-capture decay $Q$ value of $^{75}$Se and $β^-$ decay $Q$ value of $^{75}$Ge, which are derived to be 866.041(81) keV and 1178.561(65) keV, respectively. Using the nuclear energy-level data of 860.00(40) keV, 865.40(50) keV (final states of electron capture) and 1172.00(60) keV (final state of $β^-$ decay) for the excited states of $^{75}$As$^*$, we have determined the ground-state-to-excited-state $Q$ values for two transitions of $^{75}$Se $\rightarrow$ $^{75}$As$^*$ and one transition of $^{75}$Ge $\rightarrow$ $^{75}$As$^*$. The ground-state-to-excited-state $Q$ values are determined to be 6.04(41) keV, 0.64(51) keV and 6.56(60) keV, respectively, thus confirming that the three low $Q$-value transitions are all energetically valid and one of them is a possible candidate channel for antineutrino mass determination. Furthermore, the ground-state-to-excited-state $Q$ value of transition $^{75}$Se $\rightarrow$ $^{75}$As$^*$ (865.40(50) keV) is revealed to be ultra-low (< 1 keV) and the first-ever confirmed EC transition possessing an ultra-low $Q$ value from direct measurements.
