Search for triple and quadruple β decay of Nd150

@article{Barabash2019SearchFT,
  title={Search for triple and quadruple 
$\beta$
 decay of 
Nd150},
  author={A. S. Barabash and Ph. Hubert and Abdellatif Nachab and V I Umatov},
  journal={Physical Review C},
  year={2019}
}
Triple beta decay of $^{150}$Nd to the ground and excited states of $^{150}$Eu and quadruple beta decay of $^{150}$Nd to the excited states of $^{150}$Gd have been studied using a 400 cm$^3$ low-background HPGe detector and an external source consisting of 3046 g of natural Nd$_2$O$_3$ powder. A half-life limit for the quadruple beta decay to the 0$_1^+$ state of $^{150}$Gd was found to be $T_{1/2} (0\nu+4\nu) > 8.7\times10^{20}$ yr (90\% C.L.). For other (0$\nu$+4$\nu$) transitions to the 2$_1… 

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