Selective population of unbound states in 10Li

Smith, J. K.; Baumann, T.; Brown, J.; DeYoung, Paul; Frank, N.; Hinnefeld, J.; Kohley, Z.; Luther, B.; Marks, Braden; Spyrou, A.; Stephenson, S. L.; Thoennessen, M.; Williams, S. J.

doi:10.1016/j.nuclphysa.2015.04.011

Cited by 18 publications

(11 citation statements)

References 36 publications

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“…The EFT expansion parameter for 10 Li is estimated as M halo /M core ∼ |S 1n |/E * c ≈ 10%. A proton removal reaction experiment [104] observed two resonance states of 10 Li at energies E 2,1+ = 110 (40) keV and E 2,2+ = 500(100) keV above the neutron-core threshold. These are expected to be p-wave states.…”

Section: Applications: Unbound S-wave Neutron-core Systemsmentioning

confidence: 99%

Effective field theory description of halo nuclei

Hammer

Chen

Phillips

2017

J. Phys. G: Nucl. Part. Phys.

174

238

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Abstract. Nuclear halos emerge as new degrees of freedom near the neutron and proton driplines. They consist of a core and one or a few nucleons which spend most of their time in the classically-forbidden region outside the range of the interaction. Individual nucleons inside the core are thus unresolved in the halo configuration, and the low-energy effective interactions are short-range forces between the core and the valence nucleons. Similar phenomena occur in clusters of 4 He atoms, cold atomic gases near a Feshbach resonance, and some exotic hadrons. In these weakly-bound quantum systems universal scaling laws for s-wave binding emerge that are independent of the details of the interaction. Effective field theory (EFT) exposes these correlations and permits the calculation of non-universal corrections to them due to short-distance effects, as well as the extension of these ideas to systems involving the Coulomb interaction and/or binding in higher angular-momentum channels. Halo nuclei exhibit all these features. Halo EFT, the EFT for halo nuclei, has been used to compute the properties of single-neutron, two-neutron, and single-proton halos of s-wave and p-wave type. This review summarizes these results for halo binding energies, radii, Coulomb dissociation, and radiative capture, as well as the connection of these properties to scattering parameters, thereby elucidating the universal correlations between all these observables. We also discuss how Halo EFT's encoding of the long-distance physics of halo nuclei can be used to check and extend ab initio calculations that include detailed modeling of their short-distance dynamics.arXiv:1702.08605v2 [nucl-th] 5 Nov 2017 EFT for halo nuclei 2

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Section: Applications: Unbound S-wave Neutron-core Systemsmentioning

confidence: 99%

Effective field theory description of halo nuclei

Hammer

Chen

Phillips

2017

J. Phys. G: Nucl. Part. Phys.

174

238

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“…[43] used an energy-independent Breit-Wigner, where the FWHM is the same as the reported physical width. Here we use an energy-dependent Breit-Wigner, whose FWHM is narrower than the physical width Γ, due to the addition of a penetrability factor [31,45]. For the width of the resonance at 770 keV that does not have a literature value, we chose Γ =1200 keV, which corresponds to a FWHM of ∼600 keV.…”

Section: This Workmentioning

confidence: 99%

Neutron correlations in the decay of the first excited state of 11Li

et al. 2016

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The decay of unbound excited 11 Li was measured after being populated by a two-proton removal from a 13 B beam at 71 MeV/nucleon. Decay energy spectra and Jacobi plots were obtained from measurements of the momentum vectors of the 9 Li fragment and neutrons. A resonance at an excitation energy of ∼1.2 MeV was observed. The kinematics of the decay are equally well fit by a simple dineutron-like model or a phase-space model that includes final state interactions. A sequential decay model can be excluded.

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“…Fragmentation from 18 O [6,7], one-and two-particle removal from 11 Be, 11 Li and 12 B [8][9][10][11][12][13], multineutron transfer [14][15][16][17][18][19] and stopped pion absorption reactions [20] have added significant information to the knowledge of the 10 Li nucleus thanks to their different selectivity. Most of the studies report on the presence of a p 1=2 neutron resonance peaked at around 500-700 keV, with the possible population of the other member of the doublet at about 100-200 keV [12,16,18]. Some of these works agreed on the presence of an s-wave virtual state close to the threshold with a scattering length in the range from −20 to −30 fm [7,8,10,11].…”

mentioning

confidence: 99%

Investigation of the Li10 shell inversion by neutron continuum transfer reaction

et al. 2017

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This Letter reports a study of the highly debated ^{10}Li structure through the d(^{9}Li,p)^{10}Li one-neutron transfer reaction at 100 MeV. The ^{10}Li energy spectrum is measured up to 4.6 MeV and angular distributions corresponding to different excitation energy regions are reported for the first time. The comparison between data and theoretical predictions, including pairing correlation effects, shows the existence of a p_{1/2} resonance at 0.45±0.03 MeV excitation energy, while no evidence for a significant s-wave contribution close to the threshold energy is observed. Moreover, two high-lying structures are populated at 1.5 and 2.9 MeV. The corresponding angular distributions suggest a significant s_{1/2} partial-wave contribution for the 1.5 MeV structure and a mixing of configurations at higher energy, with the d_{5/2} partial-wave contributing the most to the cross section.

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Selective population of unbound states in 10Li

Cited by 18 publications

References 36 publications

Effective field theory description of halo nuclei

Effective field theory description of halo nuclei

Neutron correlations in the decay of the first excited state of 11Li

Investigation of the Li10 shell inversion by neutron continuum transfer reaction

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