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Ultra-sensitive γ-ray spectroscopy set-up for investigating primordial lithium problem

Research output: Contribution to journalArticle

  • G. Gervino
  • C. Gustavino
  • D. Trezzi
  • M. Anders
  • A. Boeltzig
  • D. Bemmerer
  • A. Best
  • C. Broggini
  • C. Bruno
  • A. Caciolli
  • F. Cavanna
  • P. Corvisiero
  • R. Depalo
  • A. DiLeva
  • Z. Elekes
  • F. Ferraro
  • A. Formicola
  • Zs Fülöp
  • A. Guglielmetti
  • Gy Gyürky
  • G. Imbriani
  • M. Junker
  • R. Menegazzo
  • P. Prati
  • O. Straniero
  • T. Szücs

Related Edinburgh Organisations

Original languageEnglish
Pages (from-to)617–619
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Early online date12 Nov 2015
StatePublished - Jul 2016


To precisely determine BBN 6Li production, the cross-section of the nuclear reaction 2H(α, γ)6Li must be directly measured within the astrophysical energy range of 30-400keV. This measure requires an ultra-low γ-ray background in the experimental set-up. We have realized the conditions matching these very strict requirements at LUNA, the deep underground accelerator laboratory active in the INFN Gran Sasso National Laboratory (LNGS), Italy: the γ-ray spectrometer background has been reduced down to reach unmatched low levels, comparable to the good ones experienced in dedicated off-line underground ultra low γ counting rate. We present and discuss the γ-ray background reduction reached in the HpGe spectrometer, where most of the remaining γ-ray background seen in the spectra are coming from the energetic deuterons scattered in the gas target by the α beam. Thanks to the low neutron environmental background at LUNA, the effect of this weak flux of 2-3MeV neutrons on HpGe detectors has been studied in details and the results are presented and discussed.

    Research areas

  • Gamma spectroscopy, Lithium problem, Underground Physics

ID: 25256916