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Title: 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 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.
Authors:
;  [1] ; ;  [2] ; ; ;  [3] ; ; ; ;  [4] ; ; ; ;  [5] ; ; ; ;  [6] ;  [7] more »; « less
  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)
Publication Date:
OSTI Identifier:
22263668
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1572; Journal 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)
Country of Publication:
United States
Language:
English
Subject:
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