Study of transfer reactions induced by a 16C beam
Recent experiments have evidenced the existence of new nuclear shell gaps at N=14 and N=16 in neutron-rich oxygen isotopes associated with the vanishing of the N=20 shell gap. However, in the neutron-rich carbon isotopes, the extent to which these gaps persist is unclear. In an effort to answer this...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universidad de Santiago de Compostela (USC) |
| Repositorio: | Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela |
| Idioma: | inglés |
| OAI Identifier: | oai:minerva.usc.gal:10347/15161 |
| Acceso en línea: | http://hdl.handle.net/10347/15161 |
| Access Level: | acceso abierto |
| Palabra clave: | Materias::Investigación::22 Física::2207 Física atómica y nuclear::220719 Estructura nuclear Materias::Investigación::22 Física::2207 Física atómica y nuclear::220717 Reacción nuclear y dispersión |
| Sumario: | Recent experiments have evidenced the existence of new nuclear shell gaps at N=14 and N=16 in neutron-rich oxygen isotopes associated with the vanishing of the N=20 shell gap. However, in the neutron-rich carbon isotopes, the extent to which these gaps persist is unclear. In an effort to answer this question we have attempted to probe the low-lying level structure of 17C using the (d,p) transfer reaction to locate the single-particle orbitals involved in the formation of the N=14 and N=16 shell gaps. The experiment was carried out at the GANIL facility. A 16C beam at 17.2 AMeV produced by fragmentation was used to bombard a CD2 target. The light ejectiles were detected using the TIARA silicon strip array while a Si-Si-CsI telescope was placed at zero degrees to identify beam-like residues. In addition, four HPGe-EXOGAM clover detectors were used to measure the gamma-rays arising from 17C bound excited states. The measured angular distributions confirm the spin and parity assignments of 3/2+, 1/2+ and 5/2+ for the ground and the first and second excited states located at 217 keV and 335 keV respectively. The spectroscopic factors deduced for these excited states indicate a large single particle strength, in agreement with shell model calculations. With a strong l = 0 valence neutron component and a low separation energy, the first excited state of 17C appears as a good one-neutron halo candidate. |
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