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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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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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Journal Article
Final results of the measurement to search for rare decays of naturally occurring osmium isotopes with ultra-low background gamma-ray spectrometry
2024
Overview
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.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V,EDP Sciences ; Springer [1998-....]
Subject
