论文标题
$^{150} $ nd的双$β$衰减的测量为0 $^+_ 1 $兴奋状态$^{150} $ sm in nemo-3
Measurement of double-$β$ decay of $^{150}$Nd to the 0$^+_1$ excited state of $^{150}$Sm in NEMO-3
论文作者
论文摘要
报告了$^{150} $ nd的双$β$衰减的NEMO-3结果,向0 $^+_ 1 $和2 $^+_ 1 $激发态的$^{150} $ SM的兴奋状态。分析中使用了5.25年期间记录的数据,同位素$^{150} $ nd。首次检测到$2νβ$ to toct态的$2νβ$的信号被检测到其统计显着性超过5 $σ$的信号。半寿命的测量为$ t_ {1/2} ^{2νββ}(0 ^+_ 1)= \ left [1.11 ^{+0.19} _ { - 0.14} \,\,\,\,\ left(\ mbox {stat}} \ left(\ mbox {syst} \ right)\ right] \ times10^{20} \,\ mbox {yr} $。将限制设置为$2νβ$衰减到2 $^+_ 1 $级别,以及$0νββ$衰减到0 $^+_ 1 $和2 $^+_ 1 $级别的$^{150} $ SM的水平。
The NEMO-3 results for the double-$β$ decay of $^{150}$Nd to the 0$^+_1$ and 2$^+_1$ excited states of $^{150}$Sm are reported. The data recorded during 5.25 yr with 36.6 g of the isotope $^{150}$Nd are used in the analysis. For the first time, the signal of the $2νββ$ transition to the 0$^+_1$ excited state is detected with a statistical significance exceeding 5$σ$. The half-life is measured to be $T_{1/2}^{2νββ}(0^+_1) = \left[ 1.11 ^{+0.19}_{-0.14} \,\left(\mbox{stat}\right) ^{+0.17}_{-0.15}\, \left(\mbox{syst}\right) \right] \times10^{20}\,\mbox{yr}$. The limits are set on the $2νββ$ decay to the 2$^+_1$ level and on the $0νββ$ decay to the 0$^+_1$ and 2$^+_1$ levels of $^{150}$Sm.