Details

Autor(en) / Beteiligte

• 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.

Titel

Final results of the measurement to search for rare decays of naturally occurring osmium isotopes with ultra-low background gamma-ray spectrometry

Ist Teil von

• The European physical journal. A, Hadrons and nuclei, 2024-07, Vol.60 (7), Article 150

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 α decays of 184 Os to the first 2 + 103.6 keV excited level of 180 W ( T 1/2  ≥ 9.3 × 10 15  yr) and of 186 Os to the first 2 + 100.1 keV of 182 W ( T 1/2  ≥ 4.8 × 10 17  yr) exceed substantially the present theoretical predictions that are at level of T 1/2  ~ (0.6–3) × 10 15  yr for 184 Os and T 1/2  ~ (0.3–2) × 10 17  yr for 186 Os. New half-life limits on the 2EC and ECβ + 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 × 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.