학술논문
Cross-shell states in $^{15}$C: a test for p-sd interactions
Document Type
Working Paper
Author
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.; Wheldon, C.
Source
Subject
Language
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.