RESONEUT

Schematic cross-section of RESONEUT

RESONEUT is built for spectroscopy of low-lying proton resonances using (d,n) reactions in inverse kinematics with radioactive beams. The setup consists of 9 p-terphenyl scintillator crystals as neutron detectors placed 23 cm upstream of the target, along with silicon strip detectors, a gas ionization chamber, and NaI detectors. The p-terphenyl crystals provide good detection efficiency for low-energy neutrons below 300 keV emitted at backward angles in the reactions of interest. Pulse shape discrimination is used to distinguish neutrons from gamma background. Experiments were performed with stable ¹²C beams on deuterated targets, populating proton resonances in ¹³N. The setup achieved ~200 keV energy resolution, a detection efficiency of around 0.5% per crystal, and a total efficiency of around 2-5% depending on neutron energy. Overall this provides a compact, high-efficiency system to study low-lying resonances with radioactive beams using (d,n) reactions.