Abstract
A spectroscopic study of 17C was performed via the one-neutron knockout reaction of 18C on a carbon target at RIKEN-RIBF. Three unbound states at excitation energies of 2.66(2), 3.16(5), and 3.97(3) MeV (preliminary) were observed. The energies are compared with shell-model calculations and existing measurements to deduce their spin-parities. From the comparison, the states at 2.66(2) and 3.97(3) MeV are suggested to be 1/2− and 3/2−, respectively. From its decay property, the state at 3.16(5) MeV is indicated to be 9/2+.
Highlights
EPJ Web of Conferences due to their anomalous level structures
The breakdown of the N = 14 gap in carbon isotopes has been ascribed to the near degeneracy of the s1/2 and d5/2 orbits and to the reduced neutron-neutron interaction when going from oxygen to carbon nuclei [1]
We present a spectroscopic study on a neutronrich odd carbon isotope, 17C, performed to furnish information on energy levels, especially above the neutron threshold
Summary
The ground state spin-parities (Jπ) of 15,17,19C nuclei, 1/2+, 3/2+, and 1/2+, do not follow naive shell-model expectations. Isotopes, where Ex(2+1 ) exhibits a turned out to be not much different from that of neighboring evenThis migration of the 2+1 energy is distinct from that of oxygen sudden jump at 22O14, signifying the emergence of the shell gap at the neutron number N = 14 [2]. The breakdown of the N = 14 gap in carbon isotopes has been ascribed to the near degeneracy of the s1/2 and d5/2 orbits and to the reduced neutron-neutron interaction when going from oxygen to carbon nuclei [1]. We present a spectroscopic study on a neutronrich odd carbon isotope, 17C, performed to furnish information on energy levels, especially above the neutron threshold.
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