Two-neutron halo structure of 
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Michel, N.; Li, J. G.; Fang, Xu; Zuo, Wei

doi:10.1103/physrevc.101.031301

Cited by 46 publications

(69 citation statements)

References 39 publications

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“…F were predicted in a Gamow Shell Model framework [71]. The prediction for 27 F is slightly higher and that of 29 Fis slightly lower than the data presented here.…”

Section: -31contrasting

confidence: 66%

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Two-Neutron Halo is Unveiled in F29

Bagchi¹,

Kanungo²,

Tanaka³

et al. 2020

Phys. Rev. Lett.

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We report the measurement of reaction cross sections (σ ex R ) of 27,29 F with a carbon target at RIKEN. The unexpectedly large σ ex R and derived matter radius identify 29 F as the heaviest twoneutron Borromean halo to date. The halo is attributed to neutrons occupying the 2p 3/2 orbital, thereby vanishing the shell closure associated with the neutron number N = 20. The results are explained by state-of-the-art shell model calculations. Coupled-cluster computations based on effective field theories of the strong nuclear force describe the matter radius of 27 F but are challenged for 29 F.

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“…F were predicted in a Gamow Shell Model framework [71]. The prediction for 27 F is slightly higher and that of 29 Fis slightly lower than the data presented here.…”

Section: -31contrasting

confidence: 66%

“…Future experiments will aim to assess the halo predicted for 31 Fi n Ref. [71] and a pairing antihalo effect predicted in Ref. [72].…”

Section: -31mentioning

confidence: 98%

Two-Neutron Halo is Unveiled in F29

Bagchi¹,

Kanungo²,

Tanaka³

et al. 2020

Phys. Rev. Lett.

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“…When the binary subsystems are all unbound, as in all these cases mentioned, we speak of a Borromean nucleus, the archetypal system for studying two-neutron correlations. Another recent theoretical work 7 , based on the Gamow shell model that treats bound and continuum states on the same footing, was applied to neutron-rich fluorine isotopes up to 31 F. The comparative plots of one-body density distributions suggest that 31 F has a halo structure with neutrons occupying an orbital with mixed configurations: 2p 3/2 , 1d 3/2 , and 1f 7/2 , while 27 F and 29 F have instead a smaller radius, less compatible with a halo. These calculations produce a 29 F-wave function where the p 3/2 components amount to only a few percent 8 , more akin to the standard scenario A above.…”

Section: Theoretical Approaches and New Experimentsmentioning

confidence: 99%

The 29F nucleus as a lighthouse on the coast of the island of inversion

et al. 2020

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The exotic, neutron-rich and weakly-bound isotope 29 F stands out as a waymarker on the southern shore of the island of inversion, a portion of the nuclear chart where the effects of nuclear forces lead to a reshuffling of the single particle levels and to a reorganization of the nuclear structure far from stability. This nucleus has become very popular, as new measurements allow to refine theoretical models. We review the latest developments and suggest how to further assess the structure by proposing predictions on electromagnetic transitions that new experiments of Relativistic Coulomb Excitation should soon become able to measure. W eakly bound nuclear systems severely test our ability to disentangle the mysteries and oddities of the nuclear interactions and how nuclear systems achieve stability. One of the latest conundrums in this respect is the structure of the exotic 29-fluorine isotope. With nine protons and 20 neutrons, it is located almost on the edge of the stability valley of the nuclide chart, very close to the neutron drip-line, i.e., the dividing line (S n = 0, null separation energy) between bound and unbound neutron-rich nuclei. Pioneering researches on this isotope have recently skyrocketed, as more and more theoretical and experimental papers are being published. The main interest lies in understanding if it belongs to the so-called island of inversion, a portion of the nuclear chart where the standard list of single-particle energy levels (that are filled by nucleons, very similarly to the atomic physics counterpart, in a sort of Aufbauprinzip, a.k.a. the building-up principle, i.e., the rule that states how electronic orbitals are filled up in the atomic shell model) shows an inversion between orbitals belonging to the sdand pf-shells, see Fig. 1. This is crucial to ascertain the presence of a neutron halo (a diffused tail of nuclear matter that spreads around the central core) and its extent. This problem relates also to the disappearance of the N = 20 neutron magic number when moving away from doubly magic nuclei. This shell evolution has profound connections with tensor nuclear interactions 1,2 and with the deformation of the nuclear surface, occurring typically at mid-shell. This system, due to its mass A = 29, is still a hard nut to crack for ab initio approaches exploiting gargantuan numerical calculations. At present, simpler schematic models

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“…Conversely, the even-even helium isotopes 4,6,8 He are bound, with 6,8 He both exhibiting halo properties [13][14][15]. To accurately reproduce nuclear halos, many-body wave functions in asymptotic regions must be treated properly, which demands to take into account continuum coupling [1,6,7,[16][17][18][19]. Adding to that, these weakly bound and unbound drip line nuclei also provide good laboratories to understand the single-particle structure, continuum coupling, internucleon correlations, and nucleon-nucleon (NN) interactions, which are not well understood in these regions.…”

Section: Introductionmentioning

confidence: 99%

“…Internucleon correlations in GSM are induced by configuration mixing, similarly to conventional SM. GSM has been seen to successfully reproduce many situations of physical interest [5,38]; for example, the resonances of oxygen drip line nuclei [38,41,42] and the neutron halo structure of 31 F [18].…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Gamow Shell Model Calculations of Drip Line Nuclei

Michel

et al. 2021

Physics

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The Gamow shell model (GSM) is a powerful method for the description of the exotic properties of drip line nuclei. Internucleon correlations are included via a configuration interaction framework. Continuum coupling is directly included at basis level by using the Berggren basis, in which, bound, resonance, and continuum single-particle states are treated on an equal footing in the complex momentum plane. Two different types of Gamow shell models have been developed: its first embodiment is that of the GSM defined with phenomenological nuclear interactions, whereas the GSM using realistic nuclear interactions, called the realistic Gamow shell model, was introduced later. The present review focuses on the recent applications of the GSM to drip line nuclei.

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Two-neutron halo structure of F31

Cited by 46 publications

References 39 publications

Two-Neutron Halo is Unveiled in F29

Two-Neutron Halo is Unveiled in F29

The 29F nucleus as a lighthouse on the coast of the island of inversion

Recent Progress in Gamow Shell Model Calculations of Drip Line Nuclei

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