Excited states in the neutron-rich nucleus 
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Vajta, Zsolt; Stănoiu, M.; Sohler, D.; Jansen, G. R.; Azaiez, F.; Dombrádi, Zsolt; Sorlin, O.; Brown, B. A.; Belléguic, M.; Borcea, C.; Bourgeois, C.; Dlouhý, Z.; Elekes, Z.; Fülöp, Zs.; Grévy, S.; Guillemaud‐Mueller, D.; Hagen, G.; Hjorth‐Jensen, M.; Ibrahim, F.; Kerek, A.; Krasznahorkay, A.; Lewitowicz, M.; Lukyanov, S. M.; Mandal, S.; Mayet, P.; Mrázek, J.; Negoiţă, F.; Penionzhkevich, Yu. É.; Podolyák, Zs.; Roussel‐Chomaz, P.; Saint‐Laurent, M. G.; Savajols, H.; Sletten, G.; Tímár, J.; Timis, C.; Yamamoto, Ayumu

doi:10.1103/physrevc.89.054323

Cited by 17 publications

(8 citation statements)

References 40 publications

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“…The unbound states above S n = 4270(100) keV were obtained in the present work, while the bound states were studied in Ref. [55]. Gray rectangles shown in the experimental spectrum and in the IM-SRG predictions, with a J π -dependent horizontal widths, correspond to uncertainties on the energy centroids of the states.…”

Section: B Discussion On the Results Of 25 Fmentioning

confidence: 99%

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: B Discussion On the Results Of 25 Fmentioning

confidence: 99%

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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“…The unbound states above Sn = 4270(100) keV were obtained in the present work, while the bound states were studied in Ref. [54]. Grey rectangles shown in the experimental spectrum and in the IM-SRG predictions, with a J π -dependent horizontal widths, correspond to uncertainties on the energy centroids of the states.…”

mentioning

confidence: 90%

“…Right: Experimental level scheme of25 F compared to shell-model calculations performed using the phenomenological USDA[31] and WBP[50] interactions and with ab initio valence-space Hamiltonians derived from IM-SRG[23,24]. The unbound states above Sn = 4270(100) keV were obtained in the present work, while the bound states were studied in Ref [54]…”

mentioning

confidence: 99%

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

Vandebrouck,

Lepailleur,

Sorlin

et al. 2017

Preprint

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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 π0d 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 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 CH2 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 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 of 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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“…The recent experimental results of 24 F have been theoretically interpreted with IM-SRG in Ref. [8] and a coupled-cluster interpretation has been presented for recently populated levels in 25 F [9]. In all these papers, the focus was on the spectroscopy of p and sd shell nuclei.…”

Section: Introductionmentioning

confidence: 99%

First-principles results for electromagnetic properties of $sd$ shell nuclei

Saxena,

Srivastava

2017

Preprint

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In this work we present ab initio shell-model calculations for electric quadrupole moments and magnetic dipole moments of sd shell nuclei using valence-space Hamiltonians derived with two ab initio approaches: the in-medium similarity renormalization group (IM-SRG) and the coupledcluster effective interaction (CCEI). Results are in a reasonable agreement with the available experimental data as well as with the results from the phenomenological USDB effective interaction. This work will add more information to the available ab initio results for the spectroscopy of sd shell nuclei.

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Excited states in the neutron-rich nucleus F25

Cited by 17 publications

References 40 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

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

First-principles results for electromagnetic properties of $sd$ shell nuclei

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