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

Journal Article · Mon Dec 30 00:00:00 EST 2013 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4856562· OSTI ID:22263668

Belli, P.; Di Marco, A. ^[1]; Bernabei, R.; D'Angelo, S. ^[2]; Cappella, F.; D'Angelo, A.; Incicchitti, A. ^[3]; Cerulli, R.; Di Vacri, M. L.; Laubenstein, M.; Nisi, S. ^[4]; Danevich, F. A.; Kobychev, V. V.; Poda, D. V.; Tretyak, V. I. ^[5]; Kovtun, G. P.; Kovtun, N. G.; Shcherban, A. P.; Solopikhin, D. A. ^[6]; Polischuk, O. G. ^[7] ; others, and

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1. INFN, Sezione di Roma Tor Vergata, Rome (Italy)
2. INFN, Sezione di Roma Tor Vergata, Rome, Italy and Dipartimento di Fisica, Università di Roma Tor Vergata, Rome (Italy)
3. INFN, Sezione di Roma La Sapienza, Rome, Italy and Dipartimento di Fisica, Università di Roma La Sapienza, Rome (Italy)
4. INFN, Laboratori Nazionali del Gran Sasso, Assergi (AQ) (Italy)
5. Institute for Nuclear Research, Kyiv (Ukraine)
6. Kharkiv Institute of Physics and Technology, Kharkiv (Ukraine)
7. INFN, Sezione di Roma La Sapienza, Rome, Italy and Institute for Nuclear Research, Kyiv (Ukraine)

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 T{sub 1/2} limits were obtained for double beta processes in {sup 96}Ru and {sup 104}Ru. Several isotopes, which potentially decay through different 2β channels, including also possible resonant double electron captures, were investigated for the first time ({sup 156}Dy, {sup 158}Dy, {sup 184}Os, {sup 192}Os, {sup 190}Pt, {sup 198}Pt). Search for resonant absorption of solar {sup 7}Li axions in a LiF crystal gave the best limit for the mass of {sup 7}Li axions (< 8.6 keV). Rare alpha decay of {sup 190}Pt to the first excited level of {sup 186}Os(E{sub exc} = 137.2keV) was observed for the first time.

• OSTI ID: 22263668
• Journal Information: AIP Conference Proceedings, Vol. 1572, Issue 1; Conference: MEDEX'13: Workshop on calculation of double-beta-decay materx elements, Prague (Czech Republic), 11-14 Jun 2013; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
ALPHA DECAY
AXIONS
CRYSTALS
DYSPROSIUM 156
DYSPROSIUM 158
ELECTRON CAPTURE
EXCITED STATES
GAMMA SPECTROSCOPY
HIGH-PURITY GE DETECTORS
LITHIUM 7
LITHIUM FLUORIDES
OSMIUM 184
OSMIUM 186
OSMIUM 192
PLATINUM 190
PLATINUM 198
RUTHENIUM 104
RUTHENIUM 96