1. Cross-shell states in $^{15}$C: a test for p-sd interactions
- Author
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Lois-Fuentes, J., Fernández-Domínguez, B., Pereira-López, X., Delaunay, F., Catford, W. N., Matta, A., Orr, N. A., Duguet, T., Otsuka, T., Somà, V., Sorlin, O., Suzuki, T., Achouri, N. L., Assié, M., Bailey, S., Bastin, B., Blumenfeld, Y., Borcea, R., Caamaño, M., Caceres, L., Clément, E., Corsi, A., Curtis, N., Deshayes, Q., Farget, F., Fisichella, M., de France, G., Franchoo, S., Freer, M., Gibelin, J., Gillibert, A., Grinyer, G. F., Hammache, F., Kamalou, O., Knapton, A., Kokalova, Tz., Lapoux, V., Crom, B. Le, Leblond, S., Marqués, F. M., Morfouace, P., Pancin, J., Perrot, L., Piot, J., Pollacco, E., Ramos, D., Regueira-Castro, D., Rodríguez-Tajes, C., Roger, T., Rotaru, F., Sénoville, M., de Séréville, N., Smith, R., Stanoiu, M., Stefan, I., Stodel, C., Suzuki, D., Thomas, J. C., Timofeyuk, N., Vandebrouck, M., Walshe, J., and Wheldon, C.
- Subjects
Nuclear Experiment ,Nuclear Theory - Abstract
The low-lying structure of $^{15}$C has been investigated via the neutron-removal $^{16}$C$(d,t)$ reaction. Along with bound neutron sd-shell hole states, unbound p-shell hole states have been firmly confirmed. The excitation energies and the deduced spectroscopic factors of the cross-shell states are an important measure of the $[(p)^{-1}(sd)^{2}]$ neutron configurations in $^{15}$C. Our results show a very good agreement with shell-model calculations using the SFO-tls interaction for $^{15}$C. However, a modification of the $p$-$sd$ and $sd$-$sd$ monopole terms was applied in order to reproduce the $N=9$ isotone $^{17}$O. In addition, the excitation energies and spectroscopic factors have been compared to the first calculations of $^{15}$C with the $ab~ initio$ self-consistent Green's function method employing the NNLO$_{sat}$ interaction. The results show the sensitivity to the size of the $N=8$ shell gap and highlight the need of going beyond the current truncation scheme in the theory.
- Published
- 2023