Investigation of negative-parity states in 16C via deuteron inelastic scattering * *Supported by the National Key R & D Program of China (2018YFA0404403), the National Natural Science Foundation of China (11775004, U1867214, 11875074, 11961141003), the funding from the State Key Laboratory of Nuclear Physics and Technology, Peking University (NPT2021ZZ01), and the funding from Heavy Ion Research Facility in Lanzhou (HIR2021PY002)

Abstract

Two low-lying unbound states in 16C are investigated by deuteron inelastic scattering in inverse kinematics. Besides the 2 state at 5.45 MeV previously measured in a 1n knockout reaction, a new resonant state at 6.89 MeV is observed for the first time. The inelastic scattering angular distributions of these two states are well reproduced by the distorted-wave Born approximation (DWBA) calculation with an l = 1 excitation. In addition, the spin-parities of the unbound states are discussed and tentatively assigned based on shell model calculations using the modified YSOX interaction.