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Structure studies of excited states of 17C and 16c

The structure of excited states of 17 C has been studied using the three-neutron transfer reaction 14 C( 12 C, 9 C) 17 C at 231 MeV. Thirteen states above the neutron threshold up to 16.3 MeV excitation energy are observed. The large negative reaction Q-value of Q 0 = -46.930 MeV leads to a strong mismatch between entrance and exit channels. In this case the population of stretched configurations is strongly favoured. The lowest-lying 9/2 + state could be identified at 3.10 MeV, in excellent agreement with shell model calculations. Further tentative assignments could be given for several other states. A striking agreement is observed between excitation energies of 17 C and those states of 16 C populated in the 13 C( 12 C, 9 C) 16 C reaction, when the level schemes of both nuclei are aligned along the 9/2 + state at 3.10 MeV in 17 C and the [9/2 + ⊗ 1/2 - ]5 - state at 8.92 MeV in 16 C. Deviations between E x ( 17 C) and the difference E x ( 16 C) - 5.82 stay within the range of +0.14/ - 0.17 MeV for ten pairs of states of these isotopes.