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Search for charge non-conserving processes in 127I by coincidence technique

  • R. Bernabei
  • P. Belli
  • F. Cappella
  • R. Cerulli
  • C. J. Dai
  • A. d’Angelo
  • S. d’Angelo
  • A. Di Marco
  • H. L. He
  • A. Incicchitti
  • X. H. Ma
  • F. Montecchia
  • X. D. Sheng
  • R. G. Wang
  • Z. P. Ye
Open Access
Regular Article - Experimental Physics

Abstract

New lifetime limits on the charge non-conserving (CNC) electron capture with excitation of the 417.9 keV nuclear level in the 127I are established by using the coincidence technique. The analysed exposure is 0.87 ton × yr, collected deep underground at the Gran Sasso National Laboratory of the INFN by the highly radiopure DAMA/LIBRA setup (≈250 kg of highly radiopure NaI(Tl)). The new limit on the mean life is τ>1.2×1024 yr (90 % C.L.), about one order of magnitude larger than those previously available for CNC electron capture involving nuclear level excitations of 127I and of the same order of magnitude than those achieved for analogous processes in 129Xe.

Keywords

Excited Level Lepton Sector Atomic Shell Lifetime Limit Internal Electron Conversion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Author(s) 2012

Authors and Affiliations

  • R. Bernabei
    • 1
    • 2
  • P. Belli
    • 1
    • 2
  • F. Cappella
    • 3
    • 4
  • R. Cerulli
    • 5
  • C. J. Dai
    • 6
  • A. d’Angelo
    • 3
    • 4
  • S. d’Angelo
    • 1
    • 2
  • A. Di Marco
    • 1
    • 2
  • H. L. He
    • 6
  • A. Incicchitti
    • 3
    • 4
  • X. H. Ma
    • 6
  • F. Montecchia
    • 1
    • 2
    • 7
  • X. D. Sheng
    • 6
  • R. G. Wang
    • 6
  • Z. P. Ye
    • 6
    • 8
  1. 1.Dip. di FisicaUniversità di Roma “Tor Vergata”RomeItaly
  2. 2.INFN, sez. Roma “Tor Vergata”RomeItaly
  3. 3.Dip. di FisicaUniversità di Roma “La Sapienza”RomeItaly
  4. 4.INFN, sez. RomaRomeItaly
  5. 5.Laboratori Nazionali del Gran SassoINFNAssergiItaly
  6. 6.IHEPChinese AcademyBeijingChina
  7. 7.Lab. Sperim. Policentrico di Ingegneria MedicaUniversità di Roma “Tor Vergata”RomeItaly
  8. 8.University of Jing GangshanJi’anChina

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