Final results of the measurement to search for rare decays of naturally occurring osmium isotopes with ultra-low background gamma-ray spectrometry
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Belli, P. Bernabei, R. Cappella, F. Caracciolo, V. Cerulli, R. Danevich, F. A. Denisov, V. Yu. Incicchitti, A. Kasperovych, D. V. Kobychev, V. V. Kovtun, G. P. Laubenstein, M. Poda, D. V. Polischuk, O. G. Shcherban, A. P. Solopikhin, D. A. Tessalina, S. Tretyak, V. I. |
| author_facet | Belli, P. Bernabei, R. Cappella, F. Caracciolo, V. Cerulli, R. Danevich, F. A. Denisov, V. Yu. Incicchitti, A. Kasperovych, D. V. Kobychev, V. V. Kovtun, G. P. Laubenstein, M. Poda, D. V. Polischuk, O. G. Shcherban, A. P. Solopikhin, D. A. Tessalina, S. Tretyak, V. I. |
| contents | A long-term measurement was conducted to search for $α$, double-$α$ and double-$β$ decays with $γ$ quanta emission in naturally occurring osmium isotopes. This study took advantage of two ultra-low background HPGe detectors and one ultra-low background BEGe detector at the Gran Sasso National Laboratory (LNGS) of the INFN. Over almost 5 years of data were taken using high-purity osmium samples of approximately 173 g. The half-life limits set for a decays of $^{184}$Os to the first $2^+$ 103.6 keV excited level of $^{180}$W ($T_{1/2} > 9.3 \times 10^{15}$ yr) and of $^{186}$Os to the first $2^+$ 100.1 keV of $^{182}$W ($T_{1/2} > 4.8 \times 10^{17}$ yr) exceed substantially the present theoretical predictions that are at level of $T_{1/2} \sim (0.6 - 3) \times 10^{15}$ yr for $^{184}$Os and $T_{1/2} \sim (0.3 - 2) \times 10^{17}$ yr for $^{186}$Os. New half-life limits on the 2EC and EC$β^+$ decay of $^{184}$Os to the ground and excited levels of $^{184}$W were set at level of $T_{1/2} > 10^{16} - 10^{17}$ yr; a lower limit on the $2β^-$ decay of $^{192}$Os to the $2^+$ 316.5 keV excited level of $^{192}$Pt was estimated as $T_{1/2} > 6.1 \times 10^{20}$ yr. The half-life limits for $2α$ decay of $^{189}$Os and $^{192}$Os were set for the first time at level of $T_{1/2} > 10^{20}$ yr. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_19062 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Final results of the measurement to search for rare decays of naturally occurring osmium isotopes with ultra-low background gamma-ray spectrometry Belli, P. Bernabei, R. Cappella, F. Caracciolo, V. Cerulli, R. Danevich, F. A. Denisov, V. Yu. Incicchitti, A. Kasperovych, D. V. Kobychev, V. V. Kovtun, G. P. Laubenstein, M. Poda, D. V. Polischuk, O. G. Shcherban, A. P. Solopikhin, D. A. Tessalina, S. Tretyak, V. I. Nuclear Experiment A long-term measurement was conducted to search for $α$, double-$α$ and double-$β$ decays with $γ$ quanta emission in naturally occurring osmium isotopes. This study took advantage of two ultra-low background HPGe detectors and one ultra-low background BEGe detector at the Gran Sasso National Laboratory (LNGS) of the INFN. Over almost 5 years of data were taken using high-purity osmium samples of approximately 173 g. The half-life limits set for a decays of $^{184}$Os to the first $2^+$ 103.6 keV excited level of $^{180}$W ($T_{1/2} > 9.3 \times 10^{15}$ yr) and of $^{186}$Os to the first $2^+$ 100.1 keV of $^{182}$W ($T_{1/2} > 4.8 \times 10^{17}$ yr) exceed substantially the present theoretical predictions that are at level of $T_{1/2} \sim (0.6 - 3) \times 10^{15}$ yr for $^{184}$Os and $T_{1/2} \sim (0.3 - 2) \times 10^{17}$ yr for $^{186}$Os. New half-life limits on the 2EC and EC$β^+$ decay of $^{184}$Os to the ground and excited levels of $^{184}$W were set at level of $T_{1/2} > 10^{16} - 10^{17}$ yr; a lower limit on the $2β^-$ decay of $^{192}$Os to the $2^+$ 316.5 keV excited level of $^{192}$Pt was estimated as $T_{1/2} > 6.1 \times 10^{20}$ yr. The half-life limits for $2α$ decay of $^{189}$Os and $^{192}$Os were set for the first time at level of $T_{1/2} > 10^{20}$ yr. |
| title | Final results of the measurement to search for rare decays of naturally occurring osmium isotopes with ultra-low background gamma-ray spectrometry |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2406.19062 |