Single-neutron excitations in 18N

C. R. Hoffman, M. Albers, M. Alcorta, S. Almaraz-Calderon, B. B. Back, S. I. Baker, S. Bedoor, P. F. Bertone, B. P. Kay, J. C. Lighthall, T. Palchan, R. C. Pardo, G. Perdikakis, K. E. Rehm, A. M. Rogers, D. Santiago-Gonzalez, Cenxi Yuan, J. P. Schiffer

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States in 18N have been populated in the neutron-adding (d,p) reaction on the short-lived 17N beam. Previously observed levels, found in this work at excitation energies of 0.12(1) MeV and 0.74(1) MeV, have been identified as those expected from a proton 0p1/2 hole coupled to the 19O 5/2 + ground state. A new state at 1.17(2) MeV is consistent with the coupling of the 1/2- proton-hole state to the excited 1/2+ state in 19O. Orbital angular momentum assignments and spectroscopic factors were determined from the measured angular distributions through a distorted wave Born approximation analysis. Systematics for the (0d5/21s1 /2)3 neutron configurations in the N=11 isotones, 17C, 18N, and 19O are discussed and comparisons to p-sd shell-model calculations are made.

Original languageEnglish
Article number044317
JournalPhysical Review C - Nuclear Physics
Issue number4
StatePublished - Oct 15 2013


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