Speaker
Description
A new $^{12}$C+$^{12}$C fusion reaction cross-section is measured via $\gamma$-rays detection within the LUNA experiment at the Bellotti Ion Beam Facility (BIBF), located at the deep underground laboratory of Gran Sasso National Laboratory. At low energies, the background inherent in detection techniques introduces significant uncertainty in the measured cross-section. Thus, reduction of background is necessary, using active and passive shielding. Two large volume NaI(Tl) annulus detectors, each segmented into eight sections, coupled with a high efficiency and high resolution HPGe detector, are employed for detecting the $\gamma$-rays in this campaign. The detection system is encased by passive shielding consisting of 25 cm of lead and 1 cm of copper. The NaI(Tl) scintillation detector from Scionix consists of a crystal of 312 mm diameter and 250 mm height with a central through-well of 110 mm diameter, mounted in an aluminium housing. Each segment is optically coupled to a series of SiPMs with a build in bias generator and preamplifier. We tested the performance of the NaI(Tl) annulus detectors surrounding the target and HPGe, used as an active anti-Compton veto to lower the detection uncertainty as well as a total absorption spectrometer.