Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/160762COMPARTIR / EXPORTAR:
 SHARE
 CORE
BASE
|
|
| Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
| Título: | Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26 |
Autor: | Vandebrouck, M.; Lepailleur, A.; Álvarez-Pol, H.; Benlliure, J.; Boillos, J. M. CSIC; García Borge, María José CSIC ORCID; Caamaño, M.; Casarejos, E.; Cortina-Gil, D.; Fraile, Luis M. ; Galaviz, D. CSIC ORCID; Nácher, Enrique CSIC ORCID; Perea, Ángel CSIC ORCID; Ribeiro, Guillermo; Tengblad, Olof CSIC ORCID ; Zuber, K. | Fecha de publicación: | 8-nov-2017 | Editor: | American Physical Society | Citación: | Physical Review C 96: 054305 (2017) | Resumen: | Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The F-26 nucleus, composed of a deeply bound pi 0d(5/2) proton and an unbound v0d(3/2) neutron on top of an O-24 core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a J(pi) = 1(1)(+) - 4(1)(+) multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The J(pi) = 1(1)(+), 2(1)(+), 4(1)(+) bound states have been determined, and only a clear identification of the J(pi) = 3(1)(+) is missing. Purpose: We wish to complete the study of the J(pi) = 1(1)(+) - 4(1)(+) multiplet in F-26, by studying the energy and width of the J(pi) = 3(1)(+) unbound state. The method was first validated by the study of unbound states in F-25, for which resonances were already observed in a previous experiment. Method: Radioactive beams of Ne-26 and Ne-27, produced at about 440AMeV by the fragment separator at the GSI facility were used to populate unbound states in F-25 and F-26 via one-proton knockout reactions on a CH2 target, located at the object focal point of the (RB)-B-3/LAND setup. The detection of emitted. rays and neutrons, added to the reconstruction of the momentum vector of the A - 1 nuclei, allowed the determination of the energy of three unbound states in F-25 and two in F-26. Results: Based on its width and decay properties, the first unbound state in F-25, at the relative energy of 49(9) keV, is proposed to be a J(pi) = 1/ 2(-) arising from a p1/2 proton- hole state. In F-26, the first resonance at 323(33) keV is proposed to be the J(pi) = 3(1)(+) member of the J(pi) = 1(1)(+) - 4(1)(+) multiplet. Energies of observed states in F-25,F-26 have been compared to calculations using the independent-particle shell model, a phenomenological shell model, and the ab initio valence-space in-medium similarity renormalization group method. Conclusions: The deduced effective proton- neutron interaction is weakened by about 30-40% in comparison to the models, pointing to the need for implementing the role of the continuum in theoretical descriptions or to a wrong determination of the atomic mass of F-26 | Descripción: | M. Vandebrouck et al. -- 13 pags., 7 figs., 3 tabs. | Versión del editor: | https://doi.org/10.1103/PhysRevC.96.054305 | URI: | http://hdl.handle.net/10261/160762 | DOI: | 10.1103/PhysRevC.96.054305 | Identificadores: | doi: 10.1103/PhysRevC.96.054305 issn: 2469-9985 |
| Aparece en las colecciones: | (CFMAC-IEM) Artículos |
Ficheros en este ítem:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| Effective proton-neutron.pdf | 2,42 MB | Adobe PDF |  Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
14
checked on 21-abr-2024
WEB OF SCIENCETM
Citations
14
checked on 24-feb-2024
Page view(s)
308
checked on 23-abr-2024
Download(s)
270
checked on 23-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.