Unbound neutron $\nu0d_{3/2}$ strength in $^{17}$C and the N=16 shell gap
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2025
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| author | Lois-Fuentes, J. Fernández-Domínguez, B. Delaunay, F. Pereira-López, X. Orr, N. A. Płoszajczak, M. Michel, N. Otsuka, T. Suzuki, T. Catford, W. N. Sorlin, O. 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. Lay, J. A. Crom, B. Le Leblond, S. Marqués, F. M. Matta, A. Morfouace, P. Moro, A. Pancin, J. Perrot, L. Piot, J. Pollacco, E. Punta, P. Ramos, D. Rodríguez-Tajes, C. Roger, T. Rotaru, F. Sénoville, M. de Séréville, N. Smith, R. Stanoiu, M. Stefani, I. Stodel, C. Suzuki, D. Thomas, J. C. Timofeyuk, N. Vandebrouck, M. Walshe, J. Wheldon, C. |
| author_facet | Lois-Fuentes, J. Fernández-Domínguez, B. Delaunay, F. Pereira-López, X. Orr, N. A. Płoszajczak, M. Michel, N. Otsuka, T. Suzuki, T. Catford, W. N. Sorlin, O. 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. Lay, J. A. Crom, B. Le Leblond, S. Marqués, F. M. Matta, A. Morfouace, P. Moro, A. Pancin, J. Perrot, L. Piot, J. Pollacco, E. Punta, P. Ramos, D. Rodríguez-Tajes, C. Roger, T. Rotaru, F. Sénoville, M. de Séréville, N. Smith, R. Stanoiu, M. Stefani, I. Stodel, C. Suzuki, D. Thomas, J. C. Timofeyuk, N. Vandebrouck, M. Walshe, J. Wheldon, C. |
| contents | Significant continuum strength has been observed to be populated in $^{17}$C produced in the d($^{16}$C,p) reaction at a beam energy of 17.2~MeV/nucleon. The strength appears at greater than $\sim$2~MeV above the single-neutron decay threshold and has been identified as arising from transfer into the neutron $0d_{3/2}$ orbital. Guided by shell model predictions the greater majority of the strength is associated with a 3/2$^+$ state at an excitation energy of 4.40$_{-0.14}^{+0.33}$ MeV and a much weaker 3/2$^+$ level at 5.60$_{-0.45}^{+1.35}$ MeV. The corresponding total widths were determined to be 3.45$_{-0.78}^{+1.82}$ and 1.6$_{-1.4}^{+4.6}$ MeV, respectively. From the backward angle proton differential cross sections and the branching ratios for neutron decay to the $^{16}$C(2$_{1}^{+}$) level, the corresponding spectroscopic factors to the ground state were deduced to be 0.47$\pm{10}$ and $<$0.09. Shell-model calculations employing the phenomenological SFO-tls interaction as well as Gamow Shell-Model calculations including continuum effects are in reasonable agreement with experiment, although the predicted strength lies at somewhat lower energy. The size of the N=16 shell gap ($\varepsilon_{ \nu0d_{3/2}}-\varepsilon _{ν1s_{1/2}}$) was estimated to be 5.08$_{-0.33}^{+0.43}$~MeV - some 1.3~MeV larger than found in the SFO-tls shell model calculation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_11696 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unbound neutron $\nu0d_{3/2}$ strength in $^{17}$C and the N=16 shell gap Lois-Fuentes, J. Fernández-Domínguez, B. Delaunay, F. Pereira-López, X. Orr, N. A. Płoszajczak, M. Michel, N. Otsuka, T. Suzuki, T. Catford, W. N. Sorlin, O. 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. Lay, J. A. Crom, B. Le Leblond, S. Marqués, F. M. Matta, A. Morfouace, P. Moro, A. Pancin, J. Perrot, L. Piot, J. Pollacco, E. Punta, P. Ramos, D. Rodríguez-Tajes, C. Roger, T. Rotaru, F. Sénoville, M. de Séréville, N. Smith, R. Stanoiu, M. Stefani, I. Stodel, C. Suzuki, D. Thomas, J. C. Timofeyuk, N. Vandebrouck, M. Walshe, J. Wheldon, C. Nuclear Experiment Nuclear Theory Significant continuum strength has been observed to be populated in $^{17}$C produced in the d($^{16}$C,p) reaction at a beam energy of 17.2~MeV/nucleon. The strength appears at greater than $\sim$2~MeV above the single-neutron decay threshold and has been identified as arising from transfer into the neutron $0d_{3/2}$ orbital. Guided by shell model predictions the greater majority of the strength is associated with a 3/2$^+$ state at an excitation energy of 4.40$_{-0.14}^{+0.33}$ MeV and a much weaker 3/2$^+$ level at 5.60$_{-0.45}^{+1.35}$ MeV. The corresponding total widths were determined to be 3.45$_{-0.78}^{+1.82}$ and 1.6$_{-1.4}^{+4.6}$ MeV, respectively. From the backward angle proton differential cross sections and the branching ratios for neutron decay to the $^{16}$C(2$_{1}^{+}$) level, the corresponding spectroscopic factors to the ground state were deduced to be 0.47$\pm{10}$ and $<$0.09. Shell-model calculations employing the phenomenological SFO-tls interaction as well as Gamow Shell-Model calculations including continuum effects are in reasonable agreement with experiment, although the predicted strength lies at somewhat lower energy. The size of the N=16 shell gap ($\varepsilon_{ \nu0d_{3/2}}-\varepsilon _{ν1s_{1/2}}$) was estimated to be 5.08$_{-0.33}^{+0.43}$~MeV - some 1.3~MeV larger than found in the SFO-tls shell model calculation. |
| title | Unbound neutron $\nu0d_{3/2}$ strength in $^{17}$C and the N=16 shell gap |
| topic | Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2505.11696 |