Speaker
Description
The $2\nu2\beta$ decay of $^{150}$Nd to the first excited 0$^{+}_{1}$ state of $^{150}$Sm (E$_{exc}$ = 740.5 keV) was studied using the low-background GeMulti setup consisting of four HPGe detectors (volume $\simeq$225 cm$^3$ each) at the Gran Sasso National Laboratories of INFN. A 2.38 kg highly purified Nd$_2$O$_3$ sample was used as the source of expected $\gamma$ rays. The de-excitation $\gamma$ rays with energies 334.0 keV and 406.5 keV were observed in both one-dimensional and coincidence spectra accumulated over 5.845 years. By interpreting an excess of the 334.0 keV peak area as an indication of decay to the 334.0 keV 2$^{+}_{1}$ excited level of $^{150}$Sm with a half-life of T$_{1/2}=[1.5^{+2.3}_{-0.6}\text{(stat)}^{+0.5}_{-0.3}\text{(syst)}] \times 10^{20}$ yr, the $2\nu2\beta$ half-life of $^{150}$Nd for the transition to the 0$^{+}_{1}$ level was determined to be T$_{1/2}= [1.03^{+0.35}_{-0.22}\text{(stat)}^{+0.16}_{-0.19}\text{(syst)}\times10^{20}$ yr, in good agreement with previous experiments. Both half-lives are reasonably consistent with theoretical predictions based on proton-neutron QRPA with isospin restoration, combined with like nucleon QRPA for the description of excited states in the final nuclei.
Details
Alice Leoncini, PhD, University of Rome Tor Vergata, Italy, https://www.fisica.uniroma2.it
| Internet talk | Maybe |
|---|---|
| Is this an abstract from experimental collaboration? | Yes |
| Name of experiment and experimental site | STELLA, LNGS |
| Is the speaker for that presentation defined? | Yes |
