Âderna Fìzika ta Energetika (Aug 2018)

Double beta decay of 150Nd to the first excited 0+ level of 150Sm: Preliminary results

  • A. S. Barabash,
  • P. Belli,
  • R. Bernabei,
  • R. S. Boiko,
  • F. Cappella,
  • V. Caracciolo,
  • R. Cerulli,
  • F. A. Danevich,
  • A. Di Marco,
  • A. Incicchitti,
  • D. V. Kasperovych,
  • R. V. Kobychev,
  • V. V. Kobychev,
  • S. I. Konovalov,
  • M. Laubenstein,
  • D. V. Poda,
  • O. G. Polischuk,
  • V. I. Tretyak,
  • V. I. Umatov

DOI
https://doi.org/10.15407/jnpae2018.02.095
Journal volume & issue
Vol. 19, no. 2
pp. 95 – 105

Abstract

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The double beta decay of 150Nd to the first excited 0+ level of 150Sm (Eexc = 740.5 keV) was investigated with the help of the ultra-low-background setup consisting of four HP Ge (high-purity germanium) detectors (≃225 cm3 volume each one) at the Gran Sasso underground laboratory of INFN (Italy). A highly purified 2.381-kg sample of neodymium oxide (Nd2O3) was used as a source of γ quanta expected in the decays. Gamma quanta with energies 334.0 keV and 406.5 keV emitted after deexcitation of the 01+ 740.5 keV excited level of 150Sm are observed in the coincidence spectra accumulated over 16375 h. The half-life relatively to the two neutrino double beta decay 150Nd → 150Sm(01+) is measured as T1/2 = [4.7+4.1-1.9(stat)±0.5(syst)]×1019 y, in agreement with results of previous experiments.

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