论文标题
$^{190} $ pt和$^{198} $ pt的双β衰减的新限制
New limits on double-beta decay of $^{190}$Pt and $^{198}$Pt
论文作者
论文摘要
在Hades Underground Laboratory实现了$^{190} $ pt和$^{198} $ pt的双β衰减和$^{198} $ pt，在Hades Underground Laboratory中实现了$γ$ -Ray Quanta的排放，并在8946 h的搜索中，由两个Ulterrow-back Affer tectors测量的148 G铂样样品。使用电感耦合的等离子体质谱法测量了铂样品的同位素组成。 $^{190} $ pt相对于不同通道和衰减模式的$^{190}半衰期的新下限设置为$ \ lim t_ {1/2} \ sim 10^{14} -10} -10^{16} $ yr。可能的确切谐振$0νkn$过渡到1,2 1326.9 $^{190} $ OS的KeV级别首次受到限制，因为$ t_ {1/2} \ geq 2.5 \ geq 2.5 \ times10^{16} $ yr。 $^{198} $ pt的双β衰变的新下限to $^{198} $ hg的第一个兴奋级别设置为$ t_ {1/2} \ geq 3.2 \ geq 3.2 \ times10^{19} $ yr，比以前的实验中获得的极限订单高。
A search for double-beta decay of $^{190}$Pt and $^{198}$Pt with emission of $γ$-ray quanta was realized at the HADES underground laboratory with a 148 g platinum sample measured by two ultralow-background HPGe detectors over 8946 h. The isotopic composition of the platinum sample has been measured with high precision using inductively coupled plasma mass spectrometry. New lower limits for the half-lives of $^{190}$Pt relative to different channels and modes of the decays were set on the level of $\lim T_{1/2}\sim 10^{14}-10^{16}$ yr. A possible exact resonant $0νKN$ transition to the 1,2 1326.9 keV level of $^{190}$Os is limited for the first time as $T_{1/2} \geq 2.5 \times10^{16}$ yr. A new lower limit on the double-beta decay of $^{198}$Pt to the first excited level of $^{198}$Hg was set as $T_{1/2} \geq 3.2\times10^{19}$ yr, one order of magnitude higher than the limit obtained in the previous experiment.
