Double-beta decay of $^{150}$Nd to excited levels of $^{150}$Sm
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2025
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| author | Barabash, A. S. Belli, P. Bernabei, R. Boiko, R. S. Cappella, F. Caracciolo, V. Cerulli, R. Danevich, F. A. Fang, D. L. Ferella, F. Incicchitti, A. Kobychev, V. V. Konovalov, S. I. Laubenstein, M. Leoncini, A. Merlo, V. Nisi, S. Nitescu, O. Poda, D. V. Polischuk, O. G. Shcherbakov, I. B. -K. Simkovic, F. Timonina, A. Tinkova, V. S. Tretyak, V. I. Umatov, V. I. |
| author_facet | Barabash, A. S. Belli, P. Bernabei, R. Boiko, R. S. Cappella, F. Caracciolo, V. Cerulli, R. Danevich, F. A. Fang, D. L. Ferella, F. Incicchitti, A. Kobychev, V. V. Konovalov, S. I. Laubenstein, M. Leoncini, A. Merlo, V. Nisi, S. Nitescu, O. Poda, D. V. Polischuk, O. G. Shcherbakov, I. B. -K. Simkovic, F. Timonina, A. Tinkova, V. S. Tretyak, V. I. Umatov, V. I. |
| contents | The $2\nu2β$ decay of $^{150}$Nd to the first excited 740.5 keV $0^{+}_{1}$ level of $^{150}$Sm was measured over 5.845 yr with the help of a four-crystal low-background HPGe $γ$ spectrometry system in the underground low-background laboratory STELLA of LNGS-INFN. A 2.381 kg highly purified Nd-containing sample was employed as the decay source. The expected de-excitation gamma-quanta of the $0^{+}_{1}$ level with energies 334.0 keV and 406.5 keV were observed both in one-dimensional spectrum and in coincidence data resulting in the half-life $T_{1/2}=[0.83^{+0.18}_{-0.13}\mathrm{(stat)}^{+0.16}_{-0.19}\mathrm{(syst)}]\times 10^{20}$ yr. Interpreting an excess of the 334.0-keV peak area as an indication of the $2β$ decay of $^{150}$Nd to the 334.0 keV $2^+_1$ excited level of $^{150}$Sm with a half-life of $T_{1/2}=[1.5^{+2.3}_{-0.6}\mathrm{(stat)}\pm 0.4\mathrm{(syst)}]\times10^{20}$ yr, the $2\nu2β$ half-life of $^{150}$Nd for the transition to the 0$^{+}_{1}$ level is $T_{1/2}=[1.03^{+0.35}_{-0.22}\mathrm{(stat)}^{+0.16}_{-0.19}\mathrm{(syst)}]\times 10^{20}$ yr, in agreement with the previous experiments. Both half-life values reasonably agree with the theoretical calculations in the framework of proton-neutron QRPA with isospin restoration combined with like nucleon QRPA for description of excited states in the final nuclei. For $2\nu2β$ and $0\nu2β$ transitions of $^{150}$Nd and $^{148}$Nd to several excited levels of $^{150}$Sm and $^{148}$Sm, limits were set at level of $T_{1/2}>10^{20}-10^{21}$ yr. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_00748 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Double-beta decay of $^{150}$Nd to excited levels of $^{150}$Sm Barabash, A. S. Belli, P. Bernabei, R. Boiko, R. S. Cappella, F. Caracciolo, V. Cerulli, R. Danevich, F. A. Fang, D. L. Ferella, F. Incicchitti, A. Kobychev, V. V. Konovalov, S. I. Laubenstein, M. Leoncini, A. Merlo, V. Nisi, S. Nitescu, O. Poda, D. V. Polischuk, O. G. Shcherbakov, I. B. -K. Simkovic, F. Timonina, A. Tinkova, V. S. Tretyak, V. I. Umatov, V. I. Nuclear Experiment Nuclear Theory The $2\nu2β$ decay of $^{150}$Nd to the first excited 740.5 keV $0^{+}_{1}$ level of $^{150}$Sm was measured over 5.845 yr with the help of a four-crystal low-background HPGe $γ$ spectrometry system in the underground low-background laboratory STELLA of LNGS-INFN. A 2.381 kg highly purified Nd-containing sample was employed as the decay source. The expected de-excitation gamma-quanta of the $0^{+}_{1}$ level with energies 334.0 keV and 406.5 keV were observed both in one-dimensional spectrum and in coincidence data resulting in the half-life $T_{1/2}=[0.83^{+0.18}_{-0.13}\mathrm{(stat)}^{+0.16}_{-0.19}\mathrm{(syst)}]\times 10^{20}$ yr. Interpreting an excess of the 334.0-keV peak area as an indication of the $2β$ decay of $^{150}$Nd to the 334.0 keV $2^+_1$ excited level of $^{150}$Sm with a half-life of $T_{1/2}=[1.5^{+2.3}_{-0.6}\mathrm{(stat)}\pm 0.4\mathrm{(syst)}]\times10^{20}$ yr, the $2\nu2β$ half-life of $^{150}$Nd for the transition to the 0$^{+}_{1}$ level is $T_{1/2}=[1.03^{+0.35}_{-0.22}\mathrm{(stat)}^{+0.16}_{-0.19}\mathrm{(syst)}]\times 10^{20}$ yr, in agreement with the previous experiments. Both half-life values reasonably agree with the theoretical calculations in the framework of proton-neutron QRPA with isospin restoration combined with like nucleon QRPA for description of excited states in the final nuclei. For $2\nu2β$ and $0\nu2β$ transitions of $^{150}$Nd and $^{148}$Nd to several excited levels of $^{150}$Sm and $^{148}$Sm, limits were set at level of $T_{1/2}>10^{20}-10^{21}$ yr. |
| title | Double-beta decay of $^{150}$Nd to excited levels of $^{150}$Sm |
| topic | Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2502.00748 |