skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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

Citation Formats

Belli, P., Di Marco, A., Bernabei, R., D'Angelo, S., Cappella, F., D'Angelo, A., Incicchitti, A., Cerulli, R., Di Vacri, M. L., Laubenstein, M., Nisi, S., Danevich, F. A., Kobychev, V. V., Poda, D. V., Tretyak, V. I., Kovtun, G. P., Kovtun, N. G., Shcherban, A. P., Solopikhin, D. A., Polischuk, O. G., and and others. Search for rare nuclear decays with HPGe detectors at the STELLA facility of the LNGS. United States: N. p., 2013. Web. doi:10.1063/1.4856562.
Belli, P., Di Marco, A., Bernabei, R., D'Angelo, S., Cappella, F., D'Angelo, A., Incicchitti, A., Cerulli, R., Di Vacri, M. L., Laubenstein, M., Nisi, S., Danevich, F. A., Kobychev, V. V., Poda, D. V., Tretyak, V. I., Kovtun, G. P., Kovtun, N. G., Shcherban, A. P., Solopikhin, D. A., Polischuk, O. G., & and others. Search for rare nuclear decays with HPGe detectors at the STELLA facility of the LNGS. United States. doi:10.1063/1.4856562.
Belli, P., Di Marco, A., Bernabei, R., D'Angelo, S., Cappella, F., D'Angelo, A., Incicchitti, A., Cerulli, R., Di Vacri, M. L., Laubenstein, M., Nisi, S., Danevich, F. A., Kobychev, V. V., Poda, D. V., Tretyak, V. I., Kovtun, G. P., Kovtun, N. G., Shcherban, A. P., Solopikhin, D. A., Polischuk, O. G., and and others. Mon . "Search for rare nuclear decays with HPGe detectors at the STELLA facility of the LNGS". United States. doi:10.1063/1.4856562.
@article{osti_22263668,
title = {Search for rare nuclear decays with HPGe detectors at the STELLA facility of the LNGS},
author = {Belli, P. and Di Marco, A. and Bernabei, R. and D'Angelo, S. and Cappella, F. and D'Angelo, A. and Incicchitti, A. and Cerulli, R. and Di Vacri, M. L. and Laubenstein, M. and Nisi, S. and Danevich, F. A. and Kobychev, V. V. and Poda, D. V. and Tretyak, V. I. and Kovtun, G. P. and Kovtun, N. G. and Shcherban, A. P. and Solopikhin, D. A. and Polischuk, O. G. and and others},
abstractNote = {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.},
doi = {10.1063/1.4856562},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1572,
place = {United States},
year = {Mon Dec 30 00:00:00 EST 2013},
month = {Mon Dec 30 00:00:00 EST 2013}
}
  • The Germanium Detector Array (GERDA) in the search for neutrinoless {beta}{beta} decays of {sup 76}Ge at LNGS will operate bare germanium diodes enriched in {sup 76}Ge in an (optional active) cryogenic fluid shield to investigate neutrinoless {beta}{beta} decay with a sensitivity of T{sub 1/2} > 2 x 10{sup 26} yr after an exposure of 100 kg yr. Recent progress includes the installation of the first underground infrastructures at Gran Sasso, the completion of the enrichment of 37.5 kg of germanium material for detector construction, prototyping of low-mass detector support and contacts, and front-end and DAQ electronics, as well as themore » preparation for construction of the cryogenic vessel and water tank.« less
  • Development of LaBr3: CE Scintillation Detectors for Gamma-Gamma Coincidence System with Applications in Fission Product Analysis
  • In this study, a radiation detection system consisting of two cerium doped lanthanum bromide (LaBr 3:Ce) scintillation detectors in a gamma-gamma coincidence configuration has been used to demonstrate the advantages that coincident detection provides relative to a single detector, and the advantages that LaBr 3:Ce detectors provide relative to high purity germanium (HPGe) detectors. Signal to noise ratios of select photopeak pairs for these detectors have been compared to high-purity germanium (HPGe) detectors in both single and coincident detector configurations in order to quantify the performance of each detector configuration. The efficiency and energy resolution of LaBr 3:Ce detectors havemore » been determined and compared to HPGe detectors. Coincident gamma-ray pairs from the radionuclides 152Eu and 133Ba have been identified in a sample that is dominated by 137Cs. Gamma-gamma coincidence successfully reduced the Compton continuum from the large 137Cs peak, revealed several coincident gamma energies characteristic of these nuclides, and improved the signal-to-noise ratio relative to single detector measurements. LaBr 3:Ce detectors performed at count rates multiple times higher than can be achieved with HPGe detectors. The standard background spectrum consisting of peaks associated with transitions within the LaBr 3:Ce crystal has also been significantly reduced. Finally, it is shown that LaBr 3:Ce detectors have the unique capability to perform gamma-gamma coincidence measurements in very high count rate scenarios, which can potentially benefit nuclear safeguards in situ measurements of spent nuclear fuel.« less
  • We investigate the discovery potential of cubic-kilometer neutrino observatories such as IceCube to set stringent limits on the forbidden decays {eta}{yields}{nu}{sub e{nu}e} and {eta}{yields}{nu}{sub {tau}{nu}{tau}.} The signatures for these decays are cascade events resulting from the charged-current reactions of {nu}{sub e}, {nu}{sub {tau},} {nu}{sub e}, and {nu}{sub {tau}}on nuclei in such detectors. Background cascade events are mainly due to {nu}{sub e}'s from atmospheric {mu}, K{sup +}, and K{sub S}{sup 0} decays and to a lesser extent from atmospheric {nu}{sub {mu}}neutral-current interactions with nuclei. A direct upper limit for the branching ratio {eta}{yields}{nu}{sub e,{tau}{nu}e,{tau}}of 6.1x10{sup -4} at 90% CL can bemore » achieved.« less