Publication

Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26

R3B Collaboration, Kalantar-Nayestanaki, N., Najafi, M. & Rigollet, C., 8-Nov-2017, In : Physical Review C. 96, 5, 13 p., 054305.

Research output: Contribution to journalArticleAcademicpeer-review

APA

R3B Collaboration, Kalantar-Nayestanaki, N., Najafi, M., & Rigollet, C. (2017). Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26. Physical Review C, 96(5), [054305]. https://doi.org/10.1103/PhysRevC.96.054305

Author

R3B Collaboration ; Kalantar-Nayestanaki, N. ; Najafi, M. ; Rigollet, C. / Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26. In: Physical Review C. 2017 ; Vol. 96, No. 5.

Harvard

R3B Collaboration, Kalantar-Nayestanaki, N, Najafi, M & Rigollet, C 2017, 'Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26', Physical Review C, vol. 96, no. 5, 054305. https://doi.org/10.1103/PhysRevC.96.054305

Standard

Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26. / R3B Collaboration ; Kalantar-Nayestanaki, N.; Najafi, M.; Rigollet, C.

In: Physical Review C, Vol. 96, No. 5, 054305, 08.11.2017.

Research output: Contribution to journalArticleAcademicpeer-review

Vancouver

R3B Collaboration, Kalantar-Nayestanaki N, Najafi M, Rigollet C. Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26. Physical Review C. 2017 Nov 8;96(5). 054305. https://doi.org/10.1103/PhysRevC.96.054305


BibTeX

@article{511462dfaa504d92a28b785624ed304b,
title = "Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26",
abstract = "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.",
keywords = "RICH NUCLEI, DETECTOR",
author = "{R3B Collaboration} and M. Vandebrouck and A. Lepailleur and O. Sorlin and T. Aumann and C. Caesar and M. Holl and V. Panin and F. Wamers and Stroberg, {S. R.} and Holt, {J. D.} and Santos, {F. de Oliveira} and H. Alvarez-Pol and L. Atar and V. Avdeichikov and S. Beceiro-Novo and D. Bemmerer and J. Benlliure and Bertulani, {C. A.} and Bogner, {S. K.} and Boillos, {J. M.} and K. Boretzky and Borge, {M. J. G.} and M. Caamano and E. Casarejos and W. Catford and J. Cederkall and M. Chartier and L. Chulkov and D. Cortina-Gil and E. Cravo and R. Crespo and Pramanik, {U. Datta} and {Diaz Fernandez}, P. and I. Dillmann and Z. Elekes and J. Enders and O. Ershova and A. Estrade and F. Farinon and Fraile, {L. M.} and M. Freer and D. Galaviz and H. Geissel and R. Gernhaeuser and J. Gibelin and N. Kalantar-Nayestanaki and M. Najafi and C. Rigollet and Taylor, {J. T.} and A. Wagner",
year = "2017",
month = nov,
day = "8",
doi = "10.1103/PhysRevC.96.054305",
language = "English",
volume = "96",
journal = "Physical Review C",
issn = "0556-2813",
publisher = "AMER PHYSICAL SOC",
number = "5",

}

RIS

TY - JOUR

T1 - Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26

AU - R3B Collaboration

AU - Vandebrouck, M.

AU - Lepailleur, A.

AU - Sorlin, O.

AU - Aumann, T.

AU - Caesar, C.

AU - Holl, M.

AU - Panin, V.

AU - Wamers, F.

AU - Stroberg, S. R.

AU - Holt, J. D.

AU - Santos, F. de Oliveira

AU - Alvarez-Pol, H.

AU - Atar, L.

AU - Avdeichikov, V.

AU - Beceiro-Novo, S.

AU - Bemmerer, D.

AU - Benlliure, J.

AU - Bertulani, C. A.

AU - Bogner, S. K.

AU - Boillos, J. M.

AU - Boretzky, K.

AU - Borge, M. J. G.

AU - Caamano, M.

AU - Casarejos, E.

AU - Catford, W.

AU - Cederkall, J.

AU - Chartier, M.

AU - Chulkov, L.

AU - Cortina-Gil, D.

AU - Cravo, E.

AU - Crespo, R.

AU - Pramanik, U. Datta

AU - Diaz Fernandez, P.

AU - Dillmann, I.

AU - Elekes, Z.

AU - Enders, J.

AU - Ershova, O.

AU - Estrade, A.

AU - Farinon, F.

AU - Fraile, L. M.

AU - Freer, M.

AU - Galaviz, D.

AU - Geissel, H.

AU - Gernhaeuser, R.

AU - Gibelin, J.

AU - Kalantar-Nayestanaki, N.

AU - Najafi, M.

AU - Rigollet, C.

AU - Taylor, J. T.

AU - Wagner, A.

PY - 2017/11/8

Y1 - 2017/11/8

N2 - 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.

AB - 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.

KW - RICH NUCLEI

KW - DETECTOR

U2 - 10.1103/PhysRevC.96.054305

DO - 10.1103/PhysRevC.96.054305

M3 - Article

VL - 96

JO - Physical Review C

JF - Physical Review C

SN - 0556-2813

IS - 5

M1 - 054305

ER -

ID: 99788552