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

M. Vandebrouck; A. Lepailleur; O. Sorlin; T. Aumann; C. Caesar; M. Holl; V. Panin; F. Wamers; S.R. Stroberg; J.D. Holt; Francois de Oliveira Santos; H. Alvarez-Pol; L. Atar; V. Avdeichikov; S. Beceiro-Novo; D. Bemmerer; J. Benlliure; C. A. Bertulani; S.K. Bogner; J.M. Boillos; K. Boretzky; M.J.G. Borge; M. Caamano; E. Casarejos; W. Catford; J. Cederkäll; M. Chartier; L. Chulkov; D. Cortina-Gil; E. Cravo; R. Crespo; U. Datta Pramanik; P. Diaz Fernandez; I. Dillmann; Z. Elekes; J. Enders; O. Ershova; A. Estrade; F. Farinon; L.M. Fraile; M. Freer; D. Galaviz; H. Geissel; R. Gernhauser; J. Gibelin; P. Golubev; K. Göbel; J. Hagdahl; T. Heftrich; M. Heil; M. Heine; A. Heinz; A. Henriques; H. Hergert; A. Hufnagel; A. Ignatov; H.T. Johansson; B. Jonson; J. Kahlbow; N. Kalantar-Nayestanaki; R. Kanungo; A. Kelic-Heil; A. Knyazev; T. Kröll; N. Kurz; M. Labiche; C. Langer; T. Le Bleis; R. Lemmon; S. Lindberg; J. Machado; J. Marganiec; F.M. Marqués; A. Movsesyan; E. Nacher; M. Najafi; E. Nikolskii; T. Nilsson; C. Nociforo; S. Paschalis; A. Perea; M. Petri; S. Pietri; R. Plag; R. Reifarth; G. Ribeiro; C. Rigollet; M. Röder; D. Rossi; D. Savran; H. Scheit; A. Schwenk; H. Simon; I. Syndikus; J. Taylor; O. Tengblad; R. Thies; Y. Togano; P. Velho; V. Volkov; A. Wagner; H. Weick; C. Wheldon; G. Wilson; J.S. Winfield; P. Woods; D. Yakorev; M. Zhukov; A. Zilges; K. Zuber

doi:10.1103/PhysRevC.96.054305

Journal Articles Physical Review C Year : 2017

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

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M. Vandebrouck

Function : Author
PersonId : 1013514

Grand Accélérateur National d'Ions Lourds

A. Lepailleur

Function : Author

Grand Accélérateur National d'Ions Lourds

O. Sorlin

Function : Author

Grand Accélérateur National d'Ions Lourds

T. Aumann

Function : Author

C. Caesar

Function : Author

M. Holl

Function : Author

V. Panin

Function : Author

F. Wamers

Function : Author

S.R. Stroberg

Function : Author

J.D. Holt

Function : Author

Francois de Oliveira Santos

Function : Author
PersonId : 176640
IdHAL : francois-de-oliveira-santos
ORCID : 0000-0003-4539-5985
IdRef : 157826392

Grand Accélérateur National d'Ions Lourds

H. Alvarez-Pol

Function : Author

L. Atar

Function : Author

V. Avdeichikov

Function : Author

S. Beceiro-Novo

Function : Author

D. Bemmerer

Function : Author

J. Benlliure

Function : Author

C. A. Bertulani

Function : Author

S.K. Bogner

Function : Author

J.M. Boillos

Function : Author

K. Boretzky

Function : Author

M.J.G. Borge

Function : Author

M. Caamano

Function : Author

E. Casarejos

Function : Author

W. Catford

Function : Author

J. Cederkäll

Function : Author

M. Chartier

Function : Author

L. Chulkov

Function : Author

D. Cortina-Gil

Function : Author

E. Cravo

Function : Author

R. Crespo

Function : Author

U. Datta Pramanik

Function : Author

P. Diaz Fernandez

Function : Author

I. Dillmann

Function : Author

Z. Elekes

Function : Author
PersonId : 755406
ORCID : 0000-0003-0571-8719

J. Enders

Function : Author

O. Ershova

Function : Author

A. Estrade

Function : Author

F. Farinon

Function : Author

L.M. Fraile

Function : Author

M. Freer

Function : Author

D. Galaviz

Function : Author

H. Geissel

Function : Author

R. Gernhauser

Function : Author

J. Gibelin

Function : Author
PersonId : 11987
IdHAL : julien-gibelin
ORCID : 0000-0001-6751-3714
IdRef : 105736708

Laboratoire de physique corpusculaire de Caen

P. Golubev

Function : Author

K. Göbel

Function : Author

J. Hagdahl

Function : Author

T. Heftrich

Function : Author

M. Heil

Function : Author

M. Heine

Function : Author
PersonId : 740800
IdHAL : marcel-heine
ORCID : 0000-0001-6219-3635

Institut Pluridisciplinaire Hubert Curien

A. Heinz

Function : Author

A. Henriques

Function : Author

H. Hergert

Function : Author

A. Hufnagel

Function : Author

A. Ignatov

Function : Author

H.T. Johansson

Function : Author

B. Jonson

Function : Author

J. Kahlbow

Function : Author

N. Kalantar-Nayestanaki

Function : Author

R. Kanungo

Function : Author

A. Kelic-Heil

Function : Author

A. Knyazev

Function : Author

T. Kröll

Function : Author

N. Kurz

Function : Author

M. Labiche

Function : Author

C. Langer

Function : Author

T. Le Bleis

Function : Author

R. Lemmon

Function : Author

S. Lindberg

Function : Author

J. Machado

Function : Author

J. Marganiec

Function : Author

F.M. Marqués

Function : Author
PersonId : 941129

Laboratoire de physique corpusculaire de Caen

A. Movsesyan

Function : Author

E. Nacher

Function : Author

M. Najafi

Function : Author

E. Nikolskii

Function : Author

T. Nilsson

Function : Author
PersonId : 755193
ORCID : 0000-0001-9604-6377

C. Nociforo

Function : Author

S. Paschalis

Function : Author

A. Perea

Function : Author

M. Petri

Function : Author

S. Pietri

Function : Author

R. Plag

Function : Author

R. Reifarth

Function : Author

G. Ribeiro

Function : Author

C. Rigollet

Function : Author

M. Röder

Function : Author

D. Rossi

Function : Author

D. Savran

Function : Author

H. Scheit

Function : Author

A. Schwenk

Function : Author

H. Simon

Function : Author

I. Syndikus

Function : Author

J. Taylor

Function : Author

O. Tengblad

Function : Author

R. Thies

Function : Author

Y. Togano

Function : Author

P. Velho

Function : Author

V. Volkov

Function : Author

A. Wagner

Function : Author

H. Weick

Function : Author

C. Wheldon

Function : Author

G. Wilson

Function : Author

J.S. Winfield

Function : Author

P. Woods

Function : Author

D. Yakorev

Function : Author

M. Zhukov

Function : Author

A. Zilges

Function : Author

K. Zuber

Function : Author

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 $^{26}$F nucleus, composed of a deeply bound $\pi0d_{5/2}$ proton and an unbound $\nu0d_{3/2}$ neutron on top of an $^{24}$O 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 $^{26}$F, by studying the energy and width of the $J^{\pi} =3^{+}_1$ unbound state. The method was firstly validated by the study of unbound states in $^{25}$F, for which resonances were already observed in a previous experiment. Method: Radioactive beams of $^{26}$Ne and $^{27}$Ne, produced at about $440A$\,MeV by the FRagment Separator at the GSI facility, were used to populate unbound states in $^{25}$F and $^{26}$F via one-proton knockout reactions on a CH$_2$ target, located at the object focal point of the R$^3$B/LAND setup. The detection of emitted $\gamma$-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 $^{25}$F and two in $^{26}$F. Results: Based on its width and decay properties, the first unbound state in $^{25}$F is proposed to be a $J^{\pi} = 1/2^-$ arising from a $p_{1/2}$ proton-hole state. In $^{26}$F, 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 $^{25,26}$F 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 of implementing the role of the continuum in theoretical descriptions, or to a wrong determination of the atomic mass of $^{26}$F.

Keywords

21.10.-k 27.30.+t 25.60.-t 29.30.Hs

Domains

Physics [physics] Nuclear Experiment [nucl-ex]

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Submitted on : Tuesday, July 25, 2017-10:10:21 AM

Last modification on : Saturday, June 25, 2022-8:24:39 PM

Dates and versions

in2p3-01568314 , version 1 (25-07-2017)

Identifiers

HAL Id : in2p3-01568314 , version 1
ARXIV : 1707.07995
DOI : 10.1103/PhysRevC.96.054305
INSPIRE : 1611614

Cite

M. Vandebrouck, A. Lepailleur, O. Sorlin, T. Aumann, C. Caesar, et al.. Effective proton-neutron interaction near the drip line from unbound states in $^{25,26}$F. Physical Review C, 2017, 96, pp.054305. ⟨10.1103/PhysRevC.96.054305⟩. ⟨in2p3-01568314⟩

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

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