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New limits on double-beta decay of 190Pt and 198Pt
Ist Teil von
The European physical journal. C, Particles and fields, 2022, Vol.82 (1)
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2022
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
A search for double-beta decay of
190
Pt and
198
Pt with emission of
γ
-ray quanta was realized at the HADES underground laboratory with a 148 g platinum sample measured by two ultralow-background HPGe detectors over 8946 h. The isotopic composition of the platinum sample has been measured with high precision using inductively coupled plasma mass spectrometry. New lower limits for the half-lives of
190
Pt relative to different channels and modes of the decays were set on the level of
lim
T
1
/
2
∼
10
14
–
10
16
year. A possible exact resonant
0
ν
K
N
transition to the 1,2 1326.9 keV level of
190
Os is limited for the first time as
T
1
/
2
≥
2.5
×
10
16
year. A new lower limit on the double-beta decay of
198
Pt to the first excited level of
198
Hg was set as
T
1
/
2
≥
3.2
×
10
19
year, one order of magnitude higher than the limit obtained in the previous experiment.