تقرير
Single-neutron knockout from $^{20}\textrm{C}$ and the structure of $^{19}\textrm{C}$
| العنوان: | Single-neutron knockout from $^{20}\textrm{C}$ and the structure of $^{19}\textrm{C}$ |
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| المؤلفون: | Hwang, J. W., Kim, S., Satou, Y., Orr, N. A., Kondo, Y., Nakamura, T., Gibelin, J., Achouri, N. L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F. M., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A. G., Vandebrouck, M., Yoneda, K. |
| سنة النشر: | 2017 |
| المجموعة: | Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Experiment, Nuclear Theory |
| الوصف: | The low-lying unbound level structure of the halo nucleus $^{19}\textrm{C}$ has been investigated using single-neutron knockout from $^{20}\textrm{C}$ on a carbon target at 280 MeV/nucleon. The invariant mass spectrum, derived from the momenta of the forward going beam velocity $^{18}\textrm{C}$ fragment and neutrons, was found to be dominated by a very narrow near threshold ($E_\textrm{rel}$ = 0.036(1) MeV) peak. Two less strongly populated resonance-like features were also observed at $E_\textrm{rel}$ = 0.84(4) and 2.31(3) MeV, both of which exhibit characteristics consistent with neutron $p$-shell hole states. Comparisons of the energies, measured cross sections and parallel momentum distributions to the results of shell-model and eikonal reaction calculations lead to spin-parity assignments of $5/2^+_1$ and $1/2^-_1$ for the levels at $E_x$ = 0.62(9) and 2.89(10) MeV with $S_n$ = 0.58(9) MeV. Spectroscopic factors were also deduced and found to be in reasonable accord with shell-model calculations. The valence neutron configuration of the $^{20}\textrm{C}$ ground state is thus seen to include, in addition to the known $1s^2_{1/2}$ component, a significant $0d^2_{5/2}$ contribution. The level scheme of $^{19}\textrm{C}$, including significantly the $1/2^-_1$ cross-shell state, is well accounted for by the YSOX shell-model interaction developed from the monopole-based universal interaction. Comment: Physics Letters B, in press |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.physletb.2017.04.019 |
| URL الوصول: | http://arxiv.org/abs/1704.03601 |
| رقم الأكسشن: | edsarx.1704.03601 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.physletb.2017.04.019 |
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