Spectroscopy of neutron-unbound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><mml:mn>27</mml:mn><mml:mo>,</mml:mo><mml:mn>28</mml:mn></mml:mrow></mml:msup></mml:math>F

Christian, G.; Frank, N.; Ash, Susan; Baumann, T.; DeYoung, Paul; Finck, J. E.; Gade, A.; Grinyer, G. F.; Luther, B.; Mosby, M.; Mosby, S.; Smith, J. K.; Snyder, J.; Spyrou, A.; Strongman, M. J.; Thoennessen, M.; Warren, M.; Weißhaar, D.; Wersal, A.

doi:10.1103/physrevc.85.034327

Cited by 29 publications

(35 citation statements)

References 37 publications

(67 reference statements)

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“…The 27 F nucleus, sitting at the lower-N border of the island, shows signatures of intruder pf -shell component in its excited state [13], contrary to its ground state, which is confirmed to be sd-shell by mass measurements [14]. Also, possible indications of pf -intruder components in the ground state of the unbound 28 F system have been reported in proton-knockout measurements [15,16].…”

Section: Introductionmentioning

confidence: 87%

Exploring two-neutron halo formation in the ground state of F29 within a three-body model

et al. 2020

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Background: The 29 F system is located at the lower-N boundary of the "island of inversion" and is an exotic, weakly bound system. Little is known about this system beyond its two-neutron separation energy (S2n) with large uncertainties. A similar situation is found for the low-lying spectrum of its unbound binary subsystem 28 F.Purpose: To investigate the configuration mixing, matter radius and neutron-neutron correlations in the groundstate of 29 F within a three-body model, exploring the possibility of 29 F to be a two-neutron halo nucleus. Method:The 29 F ground-state wave function is built within the hyperspherical formalism by using an analytical transformed harmonic oscillator basis. The Gogny-Pires-Tourreil (GPT) nn interaction with central, spin-orbit and tensor terms is employed in the present calculations, together with different core + n potentials constrained by the available experimental information on 28 F. Results:The 29 F ground-state configuration mixing and its matter radius are computed for different choices of the 28 F structure and S2n value. The admixture of d-waves with pf components are found to play an important role, favouring the dominance of dineutron configurations in the wave function. Our computed radii show a mild sensitivity to the 27 F + n potential and S2n values. The relative increase of the matter radius with respect to the 27 F core lies in the range 0.1 -0.4 fm depending upon these choices.Conclusions: Our three-body results for 29 F indicate the presence of a moderate halo structure in its ground state, which is enhanced by larger intruder components. This finding calls for an experimental confirmation.

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Section: Introductionmentioning

confidence: 87%

Exploring two-neutron halo formation in the ground state of F29 within a three-body model

et al. 2020

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“…Isotopic identification was achieved by using energy loss, time of flight, and angle/position correlation information following the procedure described in Ref. [25]. The identified carbon fragments following oneproton (or 1p1n and 1p2n) removal reactions are shown in Figure 1 where the selected 18 C fragments from the decay of 19 C are indicated by the grey area.…”

Section: Experimental Setup and Data Analysismentioning

confidence: 99%

Observation of a low-lying neutron-unbound state in 19C

et al. 2013

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Proton removal reactions from a secondary 22 N beam were utilized to populate unbound states in neutronrich carbon isotopes. Neutrons were measured with the Modular Neutron Array (MoNA) in coincidence with carbon fragments. A resonance with a decay energy of 76 (14) keV was observed in the system 18 C +n corresponding to a state in 19 C at an excitation energy of 653 (95) keV. This resonance could correspond to the first 5/2 + state which was recently speculated to be unbound in order to describe 1n and 2n removal cross section measurements from 20 C.

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“…The different beryllium isotopes were separated by time-of-flight after correcting for position and angular correlations introduced by the Sweeper dipole magnet following the procedure detailed in Ref. [26]. The final isotope separation can be seen in Fig.…”

Section: Methodsmentioning

confidence: 99%

Low-lying neutron unbound states inBe12

et al. 2014

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The neutron decay of an unbound resonance in 12 Be has been measured at 1243±21 keV decay energy with a width of 634±60 keV. This state was populated with a one-proton removal reaction from a 71 MeV/u 13 B beam incident upon a beryllium target. The invariant mass reconstruction of the resonance was achieved by measuring the daughter fragment in coincidence with neutrons. Despite being above the 2n separation energy, the state decays predominantly by the emission of one neutron to 11 Be, setting an upper limit on the branching ratio for the two-neutron decay channel to 10 Be of less than 5%. From the characteristics of the population and decay of the resonance, it is concluded that this state cannot correspond to the previously observed state at 4580±5 keV.

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Spectroscopy of neutron-unbound27,28F

Cited by 29 publications

References 37 publications

Exploring two-neutron halo formation in the ground state of F29 within a three-body model

Exploring two-neutron halo formation in the ground state of F29 within a three-body model

Observation of a low-lying neutron-unbound state in 19C

Low-lying neutron unbound states inBe12

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