Unbound excited states in 19,17C
Y.Satou, T.Nakamura, N.Fukuda, T.Sugimoto, Y.Kondo, N.Matsui,, Y.Hashimoto, T.Nakabayashi, T.Okumura, M.Shinohara, T.Motobayashi,, Y.Yanagisawa, N.Aoi, S.Takeuchi, T.Gomi, Y.Togano, S.Kawai, H.Sakurai,, H.J.Ong, T.K.Onishi, S.Shimoura, M.Tamaki, T.Kobayashi, H.Otsu, Y.Matsuda,
TL;DR
This study investigates unbound excited states in neutron-rich isotopes 19C and 17C using proton inelastic scattering, revealing new energy peaks and assigning their quantum numbers through experimental and theoretical analysis.
Contribution
It reports the first observation of specific unbound excited states in 19C and 17C, with detailed energy measurements and Jpi assignments based on experimental data and DWBA calculations.
Findings
Observed a 1.46 MeV peak in 19C
Detected three peaks in 17C at 2.20, 3.05, and 6.13 MeV
Assigned Jpi quantum numbers to the states
Abstract
The neutron-rich carbon isotopes 19,17C have been investigated via proton inelastic scattering on a liquid hydrogen target at 70 MeV/nucleon. The invariant mass method in inverse kinematics was employed to reconstruct the energy spectrum, in which fast neutrons and charged fragments were detected in coincidence using a neutron hodoscope and a dipole magnet system. A peak has been observed with an excitation energy of 1.46(10) MeV in 19C, while three peaks with energies of 2.20(3), 3.05(3), and 6.13(9) MeV have been observed in 17C. Deduced cross sections are compared with microscopic DWBA calculations based on p-sd shell model wave functions and modern nucleon-nucleus optical potentials. Jpi assignments are made for the four observed states as well as the ground states of both nuclei.
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