Search for rare nuclear decays with HPGe detectors at the STELLA facility of the LNGS

Results on the search for rare nuclear decays with the ultra low background facility STELLA at the LNGS using gamma ray spectrometry are presented. In particular, the best T1/2 limits were obtained for double beta processes in 96Ru and 104Ru. Several isotopes, which potentially decay through differe...

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Main Authors: Belli, P, Bernabei, R, Cappella, F, Cerulli, R, Danevich, F A, d'Angelo, A, d'Angelo, S, Di, Marco A, Di Vacri M L, Incicchitti, A, Kobychev, V V, Kovtun, G P, Kovtun, N G, Laubenstein, M, Nisi, S, Poda, D V, Polischuk, O G, Shcherban, A P, Solopikhin, D A, Suhonen, J, Tolmachev, A V, Tretyak, V I, Yavetskiy, R P
Format: Conference Proceeding
Language:English
Subjects:
ABSORPTION
ALPHA DECAY
AXIONS
Background radiation
CRYSTALS
DYSPROSIUM 156
DYSPROSIUM 158
ELECTRON CAPTURE
EXCITED STATES
Gamma rays
GAMMA SPECTROSCOPY
HIGH-PURITY GE DETECTORS
LITHIUM 7
Lithium fluoride
LITHIUM FLUORIDES
NUCLEAR PHYSICS AND RADIATION PHYSICS
OSMIUM 184
OSMIUM 186
OSMIUM 192
PLATINUM 190
PLATINUM 198
RUTHENIUM 104
RUTHENIUM 96
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Summary:Results on the search for rare nuclear decays with the ultra low background facility STELLA at the LNGS using gamma ray spectrometry are presented. In particular, the best T1/2 limits were obtained for double beta processes in 96Ru and 104Ru. Several isotopes, which potentially decay through different 2β channels, including also possible resonant double electron captures, were investigated for the first time (156Dy, 158Dy, 184Os, 192Os, 190Pt, 198Pt). Search for resonant absorption of solar 7Li axions in a LiF crystal gave the best limit for the mass of 7Li axions (< 8.6 keV). Rare alpha decay of 190Pt to the first excited level of 186Os(Eexc = 137.2keV) was observed for the first time.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4856562