Simulation study on ExciTrack: new method to measure excitation function of nuclear reaction using <i>γ</i>-ray detector

Abstract Measuring nuclear reaction excitation functions is challenging, particularly when short-lived radioisotopes are involved. Active-target detectors enable reactions to occur within the detection volume but face limitations under high beam intensities. To address these challenges, we conducted a simulation study focusing on the well-known 4 He+ 9 Be→n+ 12 C * (first excited state) reaction, which serves as a reliable benchmark for validating experimental methods. Our approach employs a thick-target setup combined with γ -ray detection, eliminating the need for an active target. By analyzing the time of flight from beam entry to γ -ray emission, the reaction positions can be accurately reconstructed. Using Geant4 simulations, we estimated detection efficiency and timing resolution, leading to the design of a prototype system featuring cerium-doped LYSO scintillators and photomultiplier tubes arranged around a cylindrical target vessel. This study lays the foundation for applying the method to future experiments with short-lived nuclear beams, aiming to extend its applicability to a broader range of reaction studies near the Coulomb barrier.