Ultra-sensitive in-beam gamma-ray spectroscopy for nuclear astrophysics at LUNA
A. Caciolli, L. Agostino, D. Bemmerer, R. Bonetti, C. Broggini, F., Confortola, P. Corvisiero, H. Costantini, Z. Elekes, A. Formicola, Zs. Fulop,, G. Gervino, A. Guglielmetti, C. Gustavino, Gy. Gyurky, G. Imbriani, M., Junker, M. Laubenstein, A. Lemut, B. Limata, M. Marta
TL;DR
This paper demonstrates ultra-sensitive gamma-ray spectroscopy at LUNA, reducing background noise to enable precise nuclear astrophysics experiments deep underground.
Contribution
It introduces a specialized passive shielding technique that significantly lowers gamma-ray background at LUNA, facilitating more sensitive in-beam measurements.
Findings
Gamma-ray background reduced to underground levels for E_ MeV
Feasibility of sensitive in-beam experiments confirmed
Background induced by alpha-beam characterized
Abstract
Ultra-sensitive in-beam gamma-ray spectroscopy studies for nuclear astrophysics are performed at the LUNA (Laboratory for Underground Nuclear Astrophysics) 400 kV accelerator, deep underground in Italy's Gran Sasso laboratory. By virtue of a specially constructed passive shield, the laboratory gamma-ray background for E_\gamma < 3 MeV at LUNA has been reduced to levels comparable to those experienced in dedicated offline underground gamma-counting setups. The gamma-ray background induced by an incident alpha-beam has been studied. The data are used to evaluate the feasibility of sensitive in-beam experiments at LUNA and, by extension, at similar proposed facilities.
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