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- Vandebrouck, M.National Large Heavy Ion Accelerator (GANIL) (author)
Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26
- Article/chapterEnglish2017
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- 2017
- electronicrdacarrier
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- LIBRIS-ID:oai:research.chalmers.se:789c8049-ba1c-45a7-a74a-5fc091dc3414
- https://doi.org/10.1103/PhysRevC.96.054305DOI
- https://research.chalmers.se/publication/253396URI
- https://lup.lub.lu.se/record/3cf1917a-eba6-434d-aae8-014cf529f7dfURI
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- Language:English
- Summary in:English
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- 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.
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- Lepailleur, A.National Large Heavy Ion Accelerator (GANIL),Technical University of Darmstadt (author)
- Sorlin, O.National Large Heavy Ion Accelerator (GANIL) (author)
- Aumann, T.Technical University of Darmstadt,GSI Helmholtz Centre for Heavy Ion Research (author)
- Caesar, C.Technical University of Darmstadt,GSI Helmholtz Centre for Heavy Ion Research,Texas A and M University (author)
- Holl, M.Technical University of Darmstadt (author)
- Panin, V.Technical University of Darmstadt (author)
- Wamers, F.GSI Helmholtz Centre for Heavy Ion Research,Technical University of Darmstadt (author)
- Stroberg, S. R.TRIUMF (author)
- Holt, J. D.TRIUMF (author)
- Santos, F. D. O.CEA Dam Ile-de France (DIF),GSI Helmholtz Centre for Heavy Ion Research (author)
- Alvarez-Pol, H.University of Santiago de Compostela (author)
- Atar, L. (author)
- Avdeichikov, V.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)kosu-vav (author)
- Beceiro-Novo, S.Michigan State University (author)
- Bemmerer, D.Helmholtz-Zentrum Dresden-Rossendorf (author)
- Benlliure, J.University of Santiago de Compostela (author)
- Bertulani, C. A. (author)
- Bogner, S. K.Michigan State University (author)
- Boillos, J. M.University of Santiago de Compostela (author)
- Boretzky, K.GSI Helmholtz Centre for Heavy Ion Research (author)
- Borge, M. J. G.CSIC Instituto de Estructura de la Materia (IEM),University of Caen Normandy (author)
- Caamano, M.University of Santiago de Compostela (author)
- Casarejos, E.University of Vigo (author)
- Catford, W.University of Surrey (author)
- Cederkäll, J.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-jce (author)
- Chartier, M.University of Liverpool (author)
- Chulkov, L.GSI Helmholtz Centre for Heavy Ion Research,Russian Research Center 'Kurchatov Institute' (author)
- Cortina-Gil, D.University of Santiago de Compostela (author)
- Cravo, E.University of Lisbon (author)
- Crespo, R.University of Lisbon (author)
- Pramanik, U. D.Saha Institute of Nuclear Physics (author)
- Diaz Fernandez, Paloma,1983University of Lisbon(Swepub:cth)paloma (author)
- Dillmann, I.Justus Liebig University Giessen,GSI Helmholtz Centre for Heavy Ion Research (author)
- Elekes, Z.Institute for Nuclear Research, Hungarian Academy of Sciences (ATOMKI) (author)
- Enders, J.Technical University of Darmstadt (author)
- Ershova, O.GSI Helmholtz Centre for Heavy Ion Research (author)
- Estrade, A.University of Edinburgh (author)
- Farinon, F. (author)
- Fraile, L. M.Complutense University of Madrid (author)
- Freer, M.University of Birmingham (author)
- Galaviz, D.Laboratory of Instrumentation and Experimental Particles Physics (LIP-Lisboa),University of Lisbon (author)
- Geissel, H.GSI Helmholtz Centre for Heavy Ion Research (author)
- Gernhauser, R.Technical University of Munich (author)
- Gibelin, J. (author)
- Golubev, P.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)kosu-pgo (author)
- Gobel, K.Goethe University (author)
- Hagdahl, Julius,1985Chalmers University of Technology(Swepub:cth)juliush (author)
- Heftrich, T. (author)
- Heil, M. (author)
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- Heinz, Andreas Martin,1967Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)heinza (author)
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- Johansson, Håkan T,1977Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)f96hajo (author)
- Jonson, Björn,1941Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)bjn (author)
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- Kelic-Heil, A. (author)
- Knyazev, A.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)al7342kn (author)
- Kroll, T. (author)
- Kurz, N. (author)
- Labiche, M. (author)
- Langer, C. (author)
- Le Bleis, T. (author)
- Lemmon, R. (author)
- Lindberg, Simon,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lisimo (author)
- Machado, J. (author)
- Marganiec, J. (author)
- Marques, F. M. (author)
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- Najafi, M. (author)
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- Nilsson, Thomas,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)tnilsson (author)
- Nociforo, C. (author)
- Paschalis, S. (author)
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- Petri, M. (author)
- Pietri, S. (author)
- Plag, R. (author)
- Reifarth, R. (author)
- Ribeiro, G. (author)
- Rigollet, C. (author)
- Roder, M. (author)
- Rossi, D. (author)
- Savran, D. (author)
- Scheit, H. (author)
- Schwenk, A. (author)
- Simon, H. (author)
- Syndikus, I. (author)
- Taylor, J. T.University of Liverpool(Swepub:lu)esss-jht (author)
- Tengblad, O. (author)
- Thies, Ronja,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)thies (author)
- Togano, Y. (author)
- Velho, P. (author)
- Volkov, V. (author)
- Wagner, A. (author)
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- Zhukov, Mikhail,1943Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)f2bmz (author)
- Zilges, A. (author)
- Zuber, K. (author)
- National Large Heavy Ion Accelerator (GANIL)Technical University of Darmstadt (creator_code:org_t)
- R3B Collaboration
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