Speaker
Summary
Korea Broad acceptance Recoil spectrometer and Apparatus (KoBRA) has been constructed at the Institute for Rare Isotope Science (IRIS) as part of the Rare isotope Accelerator complex for ON-line experiments (RAON) in Korea. The facility provides stable or radioactive isotope beams produced using Electron Cyclotron Resonance (ECR) ion source or ISOL system. These beams can be accelerated and transported to KoBRA at energies of 1–40 MeV/u via the SuperConducting Linear accelerator 3 (SCL3).
KoBRA is dedicated to low-energy nuclear physics research involving nuclear reactions, structure, and astrophysics. The beam commissioning phase began in May 2023. ⁴⁰Ar ion beam was successfully accelerated up to 16 MeV/u with the SCL3 accelerator and transported to KoBRA. Secondary radioactive isotope beams were produced by in-flight fragmentation reactions using a graphite (¹²C) target. Stable isotope beams aligned along the N = Z line and neutron-rich isotopes—particularly oxygen isotopes from A = 18 to 22—were produced and identified. Radioactive isotope beams were identified up to the vicinity of ³²Si. Additionally, ²⁵Na⁵⁺ radioactive isotope beam was produced from the ISOL system, accelerated up to 16 MeV/u, and transported to KoBRA.
KoBRA has demonstrated successful beam commissioning and isotope beam production, establishing itself as a dedicated science platform for low-energy nuclear research at the RAON facility. These results represent a significant step forward in advancing nuclear structure and reaction studies, and in expanding the applications of isotope beams.
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