Particle decays of levels in $^{11,12}$N and $^{12}$O investigated with the invariant-mass method
| Autor: | Webb, T. B., Charity, R. J., Elson, J. M., Hoff, D. E. M, Pruitt, C. D., Sobotka, L. G., Brown, K. W., Barney, J., Cerizza, G., Estee, J., Jhang, G., Lynch, W. G., Manfredi, J., Morfouace, P., Santamaria, C., Sweany, S., Tsang, M. B., Tsang, T., Wang, S. M., Zhang, Y., Zhu, K., Kuvin, S. A., McNeel, D., Smith, J., Wuosmaa, A. H., Chajecki, Z. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. C 100, 024306 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.100.024306 |
| Popis: | Particle-decaying states of the light nuclei $^{11,12}$N and $^{12}$O were studied using the invariant-mass method. The decay energies and intrinsic widths of a number of states were measured, and the momentum correlations of three-body decaying states were considered. A second 2$p$-decaying 2$^+$ state of $^{12}$O was observed for the first time, and a higher energy $^{12}$O state was observed in the 4$p$+2$\alpha$ decay channel. This 4$p$+2$\alpha$ channel also contains contributions from fission-like decay paths, including $^6$Be$_{g.s.}$+$^{6}$Be$_{g.s.}$. Analogs to these states in $^{12}$O were found in $^{12}$N in the 2$p$+$^{10}$B and 2$p$+$\alpha$+$^6$Li channels. The momentum correlations for the prompt 2$p$ decay of $^{12}$O$_{g.s.}$ were found to be nearly identical to those of $^{16}$Ne$_{g.s.}$, and the correlations for the new 2$^+$ state were found to be consistent with sequential decay through excited states in $^{11}$N. The momentum correlations for the 2$^+_1$ state in $^{12}$O provide a new value for the $^{11}$N ground-state energy. The states in $^{12}$N/$^{12}$O that belong to the $A$=12 isobaric sextet do not deviate from the quadratic isobaric multiplet mass equation (IMME) form. Comment: 16 pages, 16 figures, 7 tables, tables corrected |
| Databáze: | arXiv |
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