Spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>26</mml:mn></mml:msup></mml:math>F

Stănoiu, M.; Sohler, D.; Sorlin, O.; Dombrádi, Zs.; Azaiez, F.; Brown, B. A.; Borcea, C.; Bourgeois, C.; Elekes, Z.; Fülöp, Zs.; Grévy, S.; Guillemaud‐Mueller, D.; Ibrahim, F.; Kerek, A.; Krasznahorkay, A.; Lewitowicz, M.; Lukyanov, S. M.; Mrázek, J.; Negoiţă, F.; Penionzhkevich, Yu. É.; Podolyák, Zs.; Porquet, M. G.; Roussel‐Chomaz, P.; Saint‐Laurent, M. G.; Savajols, H.; Sletten, G.; Tímár, J.; Timis, C.

doi:10.1103/physrevc.85.017303

Cited by 14 publications

(23 citation statements)

References 18 publications

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“…The energies of unbound states, above S n = 1071(130) keV, were newly measured in this work, while those of the bound states are taken from Refs. [3,17,19]. Gray rectangles shown in the experimental spectrum and in the IM-SRG predictions correspond to uncertainties on the energies centroids of the states and of the S n .…”

Section: Experimental Results For 26 Fmentioning

confidence: 99%

“…[3,6,7,9,17], 26 F, which is close to the doubly magic 24 O nucleus, is particularly adapted for studying the effects of the coupling to continuum through the changes in binding energy and the width of its unbound states. These studies provide stringent constraints for future theoretical development including the treatment of the continuum, with the objective of better describing the shell evolution at the drip lines.…”

Section: Discussion On the Results Of 26 Fmentioning

confidence: 99%

“…This (π 0d 5/2 ) 1 (ν0d 3/2 ) 1 coupling results in a J π = 1 1 + − 4 1 + multiplet. Energies of the bound J π = 1 1 + ,2 1 + , and 4 1 + states were measured using different experimental techniques [3,17,18], and only a firm identification of the J π = 3 1 + component is missing. In particular, the spin assignments of the ground state (1 + ) [3,19] and of the weakly bound isomeric state (4 1 + at 643 keV) [3] were proposed from their decay pattern to low-and high-energy spin values, respectively, in the daughter nucleus 26 Ne.…”

Section: Introductionmentioning

confidence: 99%

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Effective proton-neutron interaction near the drip line from unbound states in F25,26

Vandebrouck¹,

Lepailleur²,

Sorlin³

et al. 2017

Phys. Rev. C

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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 26 F nucleus, composed of a deeply bound π 0d 5/2 proton and an unbound ν0d 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 π = 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 π = 1 1 + , 2 1 + , 4 1 + bound states have been determined, and only a clear identification of the J π = 3 1 + is missing. Purpose: We wish to complete the study of the J π = 1 1 + − 4 1 + multiplet in 26 F, by studying the energy and width of the J π = 3 1 + unbound state. The method was first 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 γ 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, at the relative energy of 49(9) keV, is proposed to be a J π = 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 π = 3 1 + member of the J π = 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 for implementing the role of the continuum in theoretical descriptions or to a wrong determination of the atomic mass of 26 F.

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Section: Experimental Results For 26 Fmentioning

confidence: 99%

Section: Discussion On the Results Of 26 Fmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effective proton-neutron interaction near the drip line from unbound states in F25,26

Vandebrouck¹,

Lepailleur²,

Sorlin³

et al. 2017

Phys. Rev. C

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“…A 2004 measurement [3] reported two γ-ray transitions in each of the 25,26,27 F isotopes, with the higher-lying 26 F transition confirmed in a recent experiment [4]. In 27 F, a transition was observed at 777 (19) keV and assigned to the first 1/2 + excited state.…”

mentioning

confidence: 82%

Spectroscopy of neutron-unbound27,28F

et al. 2012

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“…The ground state binding energy was deduced from its atomic mass value [19]. The excitation energy of the J=2 + , 0.657 (7) MeV, was obtained using the in-beam γ-ray spectroscopy technique [20], while a J=4 + 2 ms-lifetime isomeric state was discovered at 0.643 MeV from the observation of its delayed M3 transition to the 1 + ground state [21] (Fig. 3c).…”

Section: Proton-neutron Forces At the Drip-linementioning

confidence: 99%

Nuclear Structure Studies of Neutron-Rich Nuclei: Astrophysical Implications

Sorlin

2017

Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016)

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It is proposed here to investigate three major properties of the nuclear force that influence the amplitude of shell gaps, the nuclear binding energies as well as the nuclear β-decay properties far from stability, that are all key ingredients for modeling the r-process nucleosynthesis. These properties are derived from experiments performed in different facilities worldwide, using several various state-ofthe-art experimental techniques including transfer and knockout reactions. Expected consequences on the r process nucleosynthesis as well as on the stability of super heavy elements are discussed.

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Spectroscopy of26F

Cited by 14 publications

References 18 publications

Effective proton-neutron interaction near the drip line from unbound states in F25,26

Effective proton-neutron interaction near the drip line from unbound states in F25,26

Spectroscopy of neutron-unbound27,28F

Nuclear Structure Studies of Neutron-Rich Nuclei: Astrophysical Implications

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