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

Gervino, G. and Gustavino, C. and Trezzi, D. and Aliotta, M. and Anders, M. and Elekes, Zoltán and Fülöp, Zsolt and Szücs, Tamás (2016) Ultra-sensitive γ-ray spectroscopy set-up for investigating primordial lithium problem. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 824. pp. 617-619. ISSN 0168-9002

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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 30-400 keV. 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 2-3 MeV neutrons on HpGe detectors has been studied in details and the results are presented and discussed. © 2015 Elsevier B.V. All rights reserved.

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