학술논문
Complete set of bound negative-parity states in the neutron-rich 18N nucleus
Document Type
Working Paper
Author
Ziliani, S.; Ciemała, M.; Crespi, F. C. L.; Leoni, S.; Fornal, B.; Suzuki, T.; Otsuka, T.; Maj, A.; Bednarczyk, P.; Benzoni, G.; Bracco, A.; Boiano, C.; Bottoni, S.; Brambilla, S.; Bast, M.; Beckers, M.; Braunroth, T.; Camera, F.; Cieplicka-Orynczak, N.; Clément, E.; Coelli, S.; Dorvaux, O.; Erturk, S.; De France, G.; Fransen, C.; Goldkuhle, A.; Grebosz, J.; Harakeh, M. N.; Iskra, Ł. W.; Jacquot, B.; Karpov, A.; Kicinska-Habior, M.; Kimi, Y. -H.; Kmiecik, M.; Lemasson, A.; Lewitowicz, M.; Lenzi, S.; Li, H.; Matea, I.; Mazurek, K.; Michelagnoli, C.; Matejska-Minda, M.; Million, B.; Müller-Gatermann, C.; Nanal, V.; Napiorkowski, P.; Napoli, D. R.; Palit, R.; Rejmund, M.; Schmitt, Ch.; Stanoiu, M.; Stefan, I.; Vardaci, E.; Wasilewska, B.; Wieland, O.; Zieblinski, M.; Zielinska, M.
Source
Phys. Rev. C 104, L041301 (2021)
Subject
Language
Abstract
High-resolution gamma-ray spectroscopy of 18N is performed with the Advanced GAmma Tracking Array AGATA, following deep-inelastic processes induced by an 18O beam on a 181Ta target. Six states are newly identified, which together with the three known excitations exhaust all negative-parity excited states expected in 18N below the neutron threshold. Spin and parities are proposed for all located states on the basis of decay branchings and comparison with large-scale shell-model calculations performed in the p-sd space, with the YSOX interaction. Of particular interest is the location of the 0^-_1 and 1^-_2 excitations, which provide strong constrains for cross-shell p-sd matrix elements based on realistic interactions, and help to simultaneously reproduce the ground and first-excited states in 16N and 18N, for the first time. Understanding the 18N structure may also have significant impact on neutron-capture cross-section calculations in r-process modeling including light neutron-rich nuclei.