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SUMMARY:Status and plans with the GERDA experiment to probe the nature of 
 neutrinos
DTSTART;VALUE=DATE-TIME:20120704T230000Z
DTEND;VALUE=DATE-TIME:20120704T231500Z
DTSTAMP;VALUE=DATE-TIME:20130523T203656Z
UID:indico-contribution-71@cern.ch
DESCRIPTION:Speakers: Dr. MAJOROVITS\, Bela (Max-Planck-Institut für Phys
 ik (DE))\nNeutrinoless double-beta decay (DBD) could answer the key questi
 on regarding the Majorana or Dirac nature of neutrinos and give an answer 
 to the unknown absolute mass scale as well as on the neutrino mass hierarc
 hy. \nHigh-Purity Germanium (HPGe) detectors are extremely sensitive tools
  for the search of neutrinoless DBD. This is demonstrated by the GERDA (GE
 Rmanium Detector Array) experiment that is currently searching for the DBD
  of Ge-76 at the Gran Sasso underground Laboratory of INFN\, Italy. In its
  first phase it will scrutinize the claim of observation of neutrinoless D
 BD in Ge-76 made by a part of the Heidelberg-Moscow Collaboration. The GER
 DA experiment is designed to minimize the background by operating HPGe det
 ectors directly immersed in ultra-pure cryogenic liquid. \nThe GERDA physi
 cs run started in November 2011 using about 15 kg HPGe detectors  isotopic
 ally enriched in Ge-76. The status of the data taking and the most relevan
 t results will be presented.\nThe spectrum of the neutrino-accompanied DBD
  of Ge-76 has been observed with unprecedented signal-to-background ratio.
  A new \nmeasurement of the half-life of the neutrino-accompanied DBD of G
 e-76 will be given.\nFor the second phase of GERDA additional ~20 kg of Br
 oad Energy Germanium (BEGe) detectors with favorable properties for improv
 ed background recognition are being produced from material enriched in Ge-
 76. First BEGe detectors with superior energy resolution (1.7 keV at 1.3 M
 eV)have already been produced and have been characterized. The status of t
 he preparations and further plans for GERDA phase II data taking will be  
 presented.\n\nhttp://indico.cern.ch/contributionDisplay.py?contribId=71&se
 ssionId=68&confId=181298
LOCATION:Melbourne Convention and Exhibition Centre Room 217
URL:http://indico.cern.ch/contributionDisplay.py?contribId=71&sessionId=68
 &confId=181298
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