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The production of the stable isotope Li-6 in standard Big Bangnucleosynthesis has recently attracted much interest. Recent observations inmetal-poor stars suggest that a cosmological Li-6 plateau may exist. If true,this plateau would come in addition to the well-known Spite plateau of Li-7abundances and would point to a predominantly primordial origin of Li-6,contrary to the results of standard Big Bang nucleosynthesis calculations.Therefore, the nuclear physics underlying Big Bang Li-6 production must berevisited. The main production channel for Li-6 in the Big Bang is the2H(alpha,gamma)6Li reaction. The present work reports on neutron-inducedeffects in a high-purity germanium detector that were encountered in a newstudy of this reaction. In the experiment, an {\alpha}-beam from theunderground accelerator LUNA in Gran Sasso, Italy, and a windowless deuteriumgas target are used. A low neutron flux is induced by energetic deuterons fromelastic scattering and, subsequently, the 2H(d,n)3He reaction. Due to theultra-low laboratory neutron background at LUNA, the effect of this weak fluxof 2-3 MeV neutrons on well-shielded high-purity germanium detectors has beenstudied in detail. Data have been taken at 280 and 400 keV alpha-beam energyand for comparison also using an americium-beryllium neutron source.

european physical journal. a, hadrons and nuclei

Neutron-induced background by an alpha-beam incident on a deuterium gas  target and its implications for the study of the 2H(alpha,gamma)6Li reaction  at LUNA