Speaker
Description
The $2\beta$ decay of $^{150}$Nd to the first excited 0$^{+}_{1}$ level of $^{150}$Sm (E$_{exc}$ = 740.5 keV) was studied using a low-background experimental setup composed of four HPGe detectors (volume $\simeq$ 225 cm$^{3}$ each) located in the STELLA facility at the Gran Sasso National Laboratories of INFN. A highly purified sample of Nd$_{2}$O$_{3}$ (mass 2.38 kg) was measured for 51237 hours, and $\gamma$-rays with energies of 334 keV and 406.5 keV, emitted after de-excitation of the 0$^+_1$ 740.5 keV level of $^{150}$Sm, were observed in both the one-dimensional and the coincidence spectra. Preliminary, the obtained half-life of $^{150}$Nd with respect to the $2\nu2\beta$ decay to the 0$^+_1$ excited level of $^{150}$Sm is $1.1^{+0.5}_{-0.3}(stat) ^{+0.2}_{-0.2}(syst)\times 10^{20}$ yr in good agreement with the results of all previous experiments. For the $2\nu2\beta$ and $0\nu2\beta$ transitions of $^{150}$Nd and $^{148}$Nd to several other excited levels of $^{150}$Sm and $^{148}$Sm the limits are set at the level of $T_{1/2}>10^{20}-10^{21}$ yr.
Details
Vincenzo Caracciolo
| Is this abstract from experiment? | Yes |
|---|---|
| Name of experiment and experimental site | DAMA |
| Is the speaker for that presentation defined? | Yes |
| Internet talk | Yes |
