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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Autor: Pereira López, Xesús
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
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spelling Study of transfer reactions induced by a 16C beamPereira López, XesúsMaterias::Investigación::22 Física::2207 Física atómica y nuclear::220719 Estructura nuclearMaterias::Investigación::22 Física::2207 Física atómica y nuclear::220717 Reacción nuclear y dispersiónRecent 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.Fernández Domínguez, BeatrizOrr, NigelUniversidade de Santiago de Compostela. Departamento de Física de PartículasDepartamento de Física de Partículas20162016-01-0120162016-01-01doctoral thesishttp://purl.org/coar/resource_type/c_db06info:eu-repo/semantics/doctoralThesisapplication/pdfhttp://hdl.handle.net/10347/15161reponame:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostelainstname:Universidad de Santiago de Compostela (USC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Esta obra atópase baixo unha licenza internacional Creative Commons BY-NC-ND 4.0. Calquera forma de reprodución, distribución, comunicación pública ou transformación desta obra non incluída na licenza Creative Commons BY-NC-ND 4.0 só pode ser realizada coa autorización expresa dos titulares, salvo excepción prevista pola lei. Pode acceder Vde. ao texto completo da licenza nesta ligazón: https://creativecommons.org/licenses/by-nc-nd/4.0/deed.glhttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.glinfo:eu-repo/semantics/openAccessoai:minerva.usc.gal:10347/151612026-06-15T12:47:27Z
dc.title.none.fl_str_mv Study of transfer reactions induced by a 16C beam
title Study of transfer reactions induced by a 16C beam
spellingShingle Study of transfer reactions induced by a 16C beam
Pereira López, Xesús
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
title_short Study of transfer reactions induced by a 16C beam
title_full Study of transfer reactions induced by a 16C beam
title_fullStr Study of transfer reactions induced by a 16C beam
title_full_unstemmed Study of transfer reactions induced by a 16C beam
title_sort Study of transfer reactions induced by a 16C beam
dc.creator.none.fl_str_mv Pereira López, Xesús
author Pereira López, Xesús
author_facet Pereira López, Xesús
author_role author
dc.contributor.none.fl_str_mv Fernández Domínguez, Beatriz
Orr, Nigel
Universidade de Santiago de Compostela. Departamento de Física de Partículas
Departamento de Física de Partículas
dc.subject.none.fl_str_mv 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
topic 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
description 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.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-01-01
2016
2016-01-01
dc.type.none.fl_str_mv doctoral thesis
http://purl.org/coar/resource_type/c_db06
dc.type.openaire.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv http://hdl.handle.net/10347/15161
url http://hdl.handle.net/10347/15161
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.gl
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.gl
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
instname:Universidad de Santiago de Compostela (USC)
instname_str Universidad de Santiago de Compostela (USC)
reponame_str Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
collection Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
repository.name.fl_str_mv
repository.mail.fl_str_mv
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