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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)617–619
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume824
Early online date12 Nov 2015
DOIs
Publication statusPublished - Jul 2016

Keywords

  • Gamma spectroscopy
  • Lithium problem
  • Underground Physics

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