Nuclear structure studies of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">F</mml:mi><mml:mprescripts /><mml:none /><mml:mn>24</mml:mn></mml:mmultiscripts></mml:math>

Cáceres, L.; Lepailleur, A.; Sorlin, O.; Stănoiu, M.; Sohler, D.; Dombrádi, Zs.; Bogner, S. K.; Brown, B. A.; Hergert, H.; Holt, J. D.; Schwenk, A.; Azaiez, F.; Bastin, B.; Borcea, C.; Borcea, R.; Bourgeois, C.; Elekes, Z.; Fueloep, Zs.; Grévy, S.; Gaudefroy, L.; Grinyer, G. F.; Guillemaud‐Mueller, D.; Ibrahim, F.; Kerek, A.; Krasznahorkay, A.; Lewitowicz, M.; Lukyanov, S. M.; Mrázek, J.; Negoiţă, F.; Oliveira, F. de; Penionzhkevich, Yu. É.; Podolyák, Zs.; Porquet, M. G.; Rotaru, F.; Roussel‐Chomaz, P.; Saint‐Laurent, M. G.; Savajols, H.; Sletten, G.; Thomas, J. C.; Tímár, J.; Timis, C.; Vajta, Zs.

doi:10.1103/physrevc.92.014327

Cited by 20 publications

(21 citation statements)

References 37 publications

(56 reference statements)

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“…For instance, we calculated the excitation spectrum of 24 F in support of a recent experiment at GANIL [189]. In figure 20, we again compare IMSRG+SM (with ω variation) to experimental data and other theoretical results.…”

Section: Spectroscopy Of Sd-shell Nucleimentioning

confidence: 79%

“…Ground-state rotational bands of 20 Ne and 24 Mg, based on the N N + 3N (400) interaction at λ = 1.88 fm −1 . We compare results for effective interactions derived by IMSRG valence-space decoupling (e max = 14, E 3max = 14, ω = 20 MeV (dashed lines) and 24 MeV (solid lines)), the A-independent CCEI interaction [194] (e max = 12, E 3max = 14, ω = 20 MeV), and the phenomenological USDB interaction [8] to experimental data [189,193]. The dashed lines represent the neutron separation energies.…”

Section: Deformation and Rotational Bandsmentioning

confidence: 99%

“…In the following, we will discuss the implementation of valence-space decoupling via a straightforward modification of the ground-state decoupling, and review results from recent applications [164,165,189].…”

Section: Non-empirical Shell Model Interactions From the Imsrgmentioning

confidence: 99%

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In-medium similarity renormalization group for closed and open-shell nuclei

Hergert¹

2016

Phys. Scr.

145

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Abstract. We present a pedagogical introduction to the In-Medium Similarity Renormalization Group (IMSRG) framework for ab initio calculations of nuclei. The IMSRG performs continuous unitary transformations of the nuclear many-body Hamiltonian in second-quantized form, which can be implemented with polynomial computational effort. Through suitably chosen generators, it is possible to extract eigenvalues of the Hamiltonian in a given nucleus, or drive the Hamiltonian matrix in configuration space to specific structures, e.g., band-or block-diagonal form.Exploiting this flexibility, we describe two complementary approaches for the description of closed-and open-shell nuclei: The first is the Multireference IMSRG (MR-IMSRG), which is designed for the efficient calculation of nuclear ground-state properties. The second is the derivation of nonempirical valence-space interactions that can be used as input for nuclear Shell model (i.e., configuration interaction (CI)) calculations. This IMSRG+Shell model approach provides immediate access to excitation spectra, transitions, etc., but is limited in applicability by the factorial cost of the CI calculations.We review applications of the MR-IMSRG and IMSRG+Shell model approaches to the calculation of ground-state properties for the oxygen, calcium, and nickel isotopic chains or the spectroscopy of nuclei in the lower sd shell, respectively, and present selected new results, e.g., for the ground-and excited state properties of neon isotopes.Submitted to: Phys. Scr.

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Section: Spectroscopy Of Sd-shell Nucleimentioning

confidence: 79%

Section: Deformation and Rotational Bandsmentioning

confidence: 99%

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In-medium similarity renormalization group for closed and open-shell nuclei

Hergert¹

2016

Phys. Scr.

145

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“…4(d)]. With two neutrons in the 0d 3/2 orbit, this tentative 5/2 + 3 state likely decays through an = 2 neutron, leading to a final configuration (π 0d 5/2 ) 1 (ν1s 1/2 ) −2 (ν0d 3/2 ) 1 in 24 F. This coupling leads to J π = 1 1 + − 4 1 + states that were searched for by Caceres et al [33]. However, being at too high excitation energy, the 5/2 + 3 state can only decay to the J π = 3 + ground state of 24 F, that has a (π 0d 5/2 ) 1 (ν1s 1/2 ) 1 configuration.…”

Section: B Discussion On the Results Of 25 Fmentioning

confidence: 99%

“…As in Ref. [9], we choose USDA instead of USDB, since the latter is known to predict a too small excitation energy of the J π = 4 + state in 26 F. Valence-space IM-SRG has been shown to predict ground and excited states throughout the oxygen, fluorine, and neon isotopic chains [22][23][24]33]. Starting from nuclear forces derived from chiral effective field theory (EFT) [34,35], 3N forces between core and valence nucleons are typically captured by normal ordering with respect to the 16 O reference.…”

Section: Modelsmentioning

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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Excited Nuclear States for F-24 (Fluorine)

Sukhoruchkin¹,

Soroko²

2016

Supplement to I/25 a-F

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Nuclear structure studies ofF24

Cited by 20 publications

References 37 publications

In-medium similarity renormalization group for closed and open-shell nuclei

In-medium similarity renormalization group for closed and open-shell nuclei

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

Excited Nuclear States for F-24 (Fluorine)

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