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Structure of neutron-rich oxygen isotopes

AutorCortina-Gil, D.; Fernández-Vázquez, J.; Aumann, T.; Baumann, T.; Benlliure, J.; García Borge, María José ; Chulkov, L. V.; Datta Pramanik, U.; Forssén, C.; Fraile, Luis M. ; Geissel, H.; Gerl, J.; Hammache, F.; Itahashi, K.; Janik, R.; Jonson, B.; Mandal, S.; Markenroth, K.; Meister, M.; Mocko, M.; Muenzenberg, G.; Ohtsubo, T.; Ozawa, A.; Prezado, Yolanda ; Riisager, K.; Scheit, H.; Schneider, R.; Schrieder, G.; Simon, H.; Sitar, B.; Stolz, A.; Strmen, P.; Suemmerer, K.; Szarka, I.; Weick, H.
Fecha de publicación12-sep-2005
EditorInstitute of Physics Publishing
CitaciónJournal of Physics G: Nuclear and Particle Physics 31(10): S1629–S1632 (2005)
ResumenOne-nucleon removal reactions at relativistic energies have been used as a spectroscopic tool for obtaining information about the ground state of neutron-rich oxygen isotopes. Using the FRS at GSI, the longitudinal momentum distributions of the emerging fragments after breakup were measured along with the one-nucleon removal cross-sections. The relative contributions of the remaining fragments in their ground and excited states have been determined for a few cases from measurements of gamma rays in coincidence with the longitudinal momentum distribution.. The controversial case of O-23 has been directly addressed. Comparison of our exclusive momentum distributions for the one-neutron removal channel to theoretical momentum distributions calculated with an Eikonal model for the knockout process rendered a spin and parity of I-pi = 1/2(+) for the O-23 ground state. This result resolves the existent experimental discrepancy and supports sub-shell closure at N = 14 with a fairly pure 2s(1/2) neutron in O-23.
Descripción4 pages, 1 table, 2 figures.
Versión del editorhttp://dx.doi.org/10.1088/0954-3899/31/10/045
URIhttp://hdl.handle.net/10261/5494
DOI10.1088/0954-3899/31/10/045
ISSN0954-3899
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