17c的低覆盖单粒子结构和n = 14子壳闭合

论文标题

17c的低覆盖单粒子结构和n = 14子壳闭合

Low-lying single-particle structure of 17C and the N = 14 sub-shell closure

论文作者

Pereira-López, X., Fernández-Domínguez, B., Delaunay, F., Achouri, N. L., Orr, N. A., Catford, W. N., 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, T., Lapoux, V., Lay, J. A., Crom, B. Le, Leblond, S., Lois-Fuentes, J., Marqués, F. M., Matta, A., Morfouace, P., Moro, A. M., Otsuka, T., Pancin, J., Perrot, L., Piot, J., Pollacco, E., Ramos, D., Rodríguez-Tajes, C., Roger, T., Rotaru, F., Sénoville, M., de Séréville, N., Smith, R., Sorlin, O., Stanoiu, M., Stefan, I., Stodel, C., Suzuki, D., Suzuki, T., Thomas, J. C., Timofeyuk, N., Vandebrouck, M., Walshe, J., Wheldon, C.

论文摘要

通过D（16C，P）转移反应对17C结合状态的单粒子结构进行了首次研究。测得的角分布分别证实了位于217和335 keV的激发态的1/2+和5/2+的自旋差分配。这些状态推论的光谱因子与壳模型和粒子核模型计算一致，并且与它们在能量的近乎脱落相结合，为没有n = 14个子壳闭合提供了明确的证据。 3/2+基态发现的非常小的光谱因子与理论预测一致，并表明ν1D3/2强度由未结合状态携带。 1/2+激发态具有显性L = 0价中子构型和非常低的分离能，是单中子晕圈的候选者。

The first investigation of the single-particle structure of the bound states of 17C, via the d(16C, p) transfer reaction, has been undertaken. The measured angular distributions confirm the spin-parity assignments of 1/2+ and 5/2+ for the excited states located at 217 and 335 keV, respectively. The spectroscopic factors deduced for these states exhibit a marked single-particle character, in agreement with shell model and particle-core model calculations, and combined with their near degeneracy in energy provide clear evidence for the absence of the N = 14 sub-shell closure. The very small spectroscopic factor found for the 3/2+ ground state is consistent with theoretical predictions and indicates that the ν1d3/2 strength is carried by unbound states. With a dominant l = 0 valence neutron configuration and a very low separation energy, the 1/2+ excited state is a one-neutron halo candidate.

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