Abstract
Abstract
Studies of charged-particle reactions for low-energy nuclear astrophysics require high sensitivity, which can be achieved by means of detection setups with high efficiency and low backgrounds, to obtain precise measurements in the energy region of interest for stellar scenarios. High-efficiency total absorption spectroscopy is an established and powerful tool for studying radiative capture reactions, particularly if combined with the cosmic background reduction by several orders of magnitude obtained at the Laboratory for Underground Nuclear Astrophysics (LUNA). We present recent improvements in the detection setup with the Bismuth Germanium Oxide (BGO) detector at LUNA, aiming to reduce high-energy backgrounds and increase the summing detection efficiency. The new design results in enhanced sensitivity of the BGO setup, as we demonstrate and discuss in the context of the first direct measurement of the 65 keV resonance (E
x
= 5672 keV) of the 17O(p,γ)18F reaction. Moreover, we show two applications of the BGO detector, which exploit its segmentation. In the case of complex γ-ray cascades, e.g. the de-excitation of E
x
= 5672 keV in 18F, the BGO segmentation allows to identify and suppress the beam-induced background signals that mimic the sum peak of interest. We demonstrate another new application for such a detector in form of in situ activation measurements of a reaction with β
+ unstable product nuclei, e.g. the 14N(p,γ)15O reaction.
Funder
Ministero dell’Istruzione, dell’Università e della Ricerca
H2020 European Research Council
FP7 Ideas: European Research Council
Helmholtz-Gemeinschaft
Deutsche Forschungsgemeinschaft
European Cooperation in Science and Technology
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal
Science and Technology Facilities Council
Istituto Nazionale di Fisica Nucleare
Subject
Nuclear and High Energy Physics
Cited by
6 articles.
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