Production and decay of the (73)Ge*(1/2(-)) metastable state in a low-background germanium detector

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Liao H. Y. , Chang H. M. , Chou M. H. , Deniz M., Huang H. X. , Lee F. S. , ...Daha Fazla

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, cilt.35, sa.7, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 35 Konu: 7
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1088/0954-3899/35/7/077001


The (73)Ge*(1/2(-)) metastable state decays with a very characteristic signature which allows it to be tagged event-by-event. Studies were performed using data taken with a high-purity germanium detector in a low-background laboratory near a nuclear power reactor core where the (nu) over bar (e) flux was 6.4 x 10(12) cm(-2) s(-1). The measured average and equilibrium production rates of (73)Ge*(1/2-) were (8.7 +/- 0.4) and (6.7 +/- 0.3) kg(-1) day(-1), respectively. The production channels were studied and identified. By studying the difference in the production of 73Ge*(1/2-) between the reactor ON and OFF spectra, limiting sensitivities in the range of similar to 10(-42) to 10(-43) cm(2) for the cross sections of neutrino-induced nuclear transitions were derived. The dominant backgrounds are due to beta(-) decays of cosmic-ray-induced (73)Ga. The prospects of enhancing the sensitivities at underground locations are discussed.