Search for 21C and constraints on 22C

Mosby, S.; Badger, N. S.; Baumann, T.; Bazin, D.; Bennett, Michael B.; Brown, J.; Christian, G.; DeYoung, Paul; Finck, J. E.; Gardner, M. A.; Hinnefeld, J.; Höök, Erik; Lunderberg, E.; Luther, B.; Meyer, D. A.; Mosby, M.; Peaslee, Graham F.; Rogers, W.F.; Smith, J. K.; Snyder, J.; Spyrou, A.; Strongman, M. J.; Thoennessen, M.

doi:10.1016/j.nuclphysa.2013.04.004

Cited by 40 publications

(65 citation statements)

References 38 publications

(36 reference statements)

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“…5), the relative energy spectrum for proton removal from 22 N is, in contrast to an earlier very low statistics study [24], dominated by a prominent resonance-like structure at around 1 MeV which may be identified, based on the selectivity of the reaction and width, as an s-wave resonance. In the case of the neutron removal from 22 C, a relatively narrow structure is observed close to 1.5 MeV above threshold, together with a broad distribution of lower-lying strength.…”

Section: Epj Web Of Conferencescontrasting

confidence: 73%

“…In addition, 18,19 B and 21,22 C are of considerable interest in terms of the evolution of shell-structure far from stability as they span the N=14 and 16 sub-shell closures below doubly-magic 22,24 O. Indeed, the level structures of 18 B and 21 C can shed light on the evolution of the ν2s 1/2 and ν1d 5/2 levels which may become degenerate in this region [1].…”

Section: Introductionmentioning

confidence: 99%

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Exploring the Structure of the Most Neutron-rich Boron and Carbon Isotopes

Orr

2016

EPJ Web of Conferences

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Abstract. The most neutron-rich isotopes of boron and carbon are of considerable interest in terms of their few-body character -most notably through the possible formation of twoneutron haloes in the Borromean nuclei 19 B and 22 C. Here a series of recent investigations are briefly reviewed, including preliminary results from reaction studies of 18 B and 21 C. It is concluded that 22 C exhibits a prominent halo arising from a significant ν2s 2 1/2 valence neutron configuration. More generally, the structure of the dripline boron and carbon nuclei appears to be governed by the competition between the ν1d 5/2 and ν2s 1/2 singleparticle orbitals, with a 5/2

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Section: Epj Web Of Conferencescontrasting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Exploring the Structure of the Most Neutron-rich Boron and Carbon Isotopes

Orr

2016

EPJ Web of Conferences

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“…The virtual s-wave energy for the singlet nn state is fixed to E V [nn] =-147 keV. We allow a variation of the virtual state energy of 21 C with values 0 and -1 MeV [12] to spam different possibilities. We have added a wide momentum distribution to the narrow one as indicated in the figure.…”

Section: Results and Summarymentioning

confidence: 99%

Momentum distributions in light halo nuclei and structure constraints

Souza

Bellotti

Frederico

et al. 2016

EPJ Web of Conferences

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Abstract. The core recoil momentum distribution of neutron-rich isotopes of light exotic nuclei is studied within a three-body model, where the nuclei are described by a core and two neutrons, with interactions dominated by the s-wave channel. In our framework, the two-body subsystems should have large scattering lengths in comparison with the interaction range allowing to use a three-body model with a zero-range force. The ground-state halo wave functions in momentum space are obtained by using as inputs the two-neutron separation energy and the energies of the singlet neutron-neutron and neutron-core virtual states. Within our model, we obtain the momentum probability densities for the Borromean exotic nuclei 11 Li and 22 C. In the case of the core recoil momentum distribution of 11 Li, a fair reproduction of the experimental data was obtained, without free parameters, considering only the two-body low-energies. By analysing the obtained core momentum distribution in face of recent experimental data, we verify that such data are constraining the 22 C two-neutron separation energy to a value between 100 and 400 keV.

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“…In Ref. [7], the unbound 21 C nucleus was investigated through single-proton removal in 22 N at 68 MeV/u, and the 20 C + neutron spectrum was described with an s-wave line shape with negative scattering length and |a n− 21 C | < 2.8 fm, suggesting S 2n < 70 keV (see also Ref. [8]).…”

Section: Introductionmentioning

confidence: 99%

Emergent universality in the two-neutron halo structure of C22

2016

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The structure of the two-neutron halo 22 C is investigated by means of a renormalized zero-range three-body model, with interactions in the s-wave channel, and a finite-range model with two-and three-body forces provided by the hyperspherical adiabatic expansion method. In both models the halo wave function in configuration space is obtained by using as inputs the two-body scattering lengths and the two-neutron separation energy. The halo-matter density is computed for 22 C with different three-body forces and low-energy parameters, with two-neutron separation energy within the range 50 keV S 2n 1000 keV. The halo-neutron density depends weakly on the neutron-20 C scattering length as long as its absolute value is larger than the neutron-neutron one. The halo-neutron density is then analyzed by means of the root-mean-square radius, the probability density, and also the geometry, taking into account the angle between the two Jacobi coordinates. The results of finite-range and zero-range two-neutron-core models are compared. The effects in the halo structure of short-range and long-range three-body forces are studied, and the emergent universal behavior of the halo-neutron density and its geometry is pointed out.

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Search for 21C and constraints on 22C

Cited by 40 publications

References 38 publications

Exploring the Structure of the Most Neutron-rich Boron and Carbon Isotopes

Exploring the Structure of the Most Neutron-rich Boron and Carbon Isotopes

Momentum distributions in light halo nuclei and structure constraints

Emergent universality in the two-neutron halo structure of C22

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