Reconciling Coulomb breakup and neutron radiative capture

Capel, Pierre; Nollet, Yvan

doi:10.1103/physrevc.96.015801

Cited by 10 publications

(36 citation statements)

References 31 publications

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“…Our analysis hence independently confirms the value of the ANC extracted by Summers and Nunes from this same Coulombbreakup cross section [21]. The slightly larger ANC they have obtained (see line 4 of Table II ) is probably due to their use of a nonzero interaction in the p wave, which tends to reduce these contributions to the breakup [23,26,34]. Since there is no experimental observable upon which to constrain the phase shift in these partial waves, we have to rely on theoretical hypotheses.…”

Section: B Breakup Of 15 C On Lead At 68 Mev/nucleonsupporting

confidence: 85%

“…This result confirms that this reaction is purely peripheral, in the sense that it is sensitive only to the tail of the projectile wave function and not to its interior. The excellent agreement with the data observed in this reaction observable suggests that the ANC we have extracted from the transfer data, combined with the choice of a nil interaction in the p 14 C-n partial waves, is valid structurewise [23]. Accordingly, the predictions of the ab initio calculations of Navrátil et al seem correct [39].…”

Section: A Breakup Of 15 C On Lead At 605 Mev/nucleonsupporting

confidence: 67%

“…As shown in Ref. [23], for the Coulomb breakup of loosely bound s wave nuclei, it is the combination of ANC in the g.s. and phase shift in the p continuum that matters, especially at low energy E in the 14 C-n continuum and forward scattering angle.…”

Section: B Breakup Of 15 C On Lead At 68 Mev/nucleonmentioning

confidence: 92%

“…As expected from the analyses published in Refs. [21][22][23], this model of 15 C should also provide a good estimate for the radiative-capture cross section at low energy. In this section, we compare our prediction with the data of Reifarth et al [25].…”

Section: Radiative Capture 14 C(n γ ) 15 Cmentioning

confidence: 92%

“…However, it has been suggested that the Coulomb-breakup measurements could be used to infer the asymptotic normalization coefficient (ANC) of the 15 C ground-state wave function [21]. However, due to the aforementioned higher-order effects, a precise model of the reaction is needed in the analysis of the reaction [21][22][23]. Because the radiative capture 14 C(n, γ ) 15 C is a purely peripheral process [24], a reliable estimate of this ANC can then be used to compute its cross section.…”

Section: Introductionmentioning

confidence: 99%

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C15 : From halo effective field theory structure to the study of transfer, breakup, and radiative-capture reactions

2019

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Background: Aside from being a one-neutron halo nucleus, 15 C is interesting because it is involved in reactions of relevance for several nucleosynthesis scenarios. Purpose: The aim of this work is to analyze various reactions involving 15 C, using a single structure model based on halo effective field theory (halo EFT) following the excellent results obtained in [P. Capel et al., Phys. Rev. C 98, 034610 (2018)]. Method: To develop a halo-EFT model of 15 C at next to leading order (NLO), we first extract the asymptotic normalization coefficient (ANC) of its ground state by analyzing 14 C(d, p) 15 C transfer data at low energy using the method developed in [J. Yang and P. Capel, Phys. Rev. C 98, 054602 (2018)]. Using the halo-EFT description of 15 C constrained with this ANC, we study the 15 C Coulomb breakup at high (605 MeV/nucleon) and intermediate (68 MeV/nucleon) energies using eikonal-based models with a consistent treatment of nuclear and Coulomb interactions at all orders, and which take into account proper relativistic corrections. Finally, we study the 14 C(n, γ) 15 C radiative capture. Results: Our theoretical cross sections are in good agreement with experimental data for all reactions, thereby assessing the robustness of the halo-EFT model of this nucleus. Since a simple NLO description is enough to reproduce all data, the only nuclear-structure observables that matter are the 15 C binding energy and its ANC, showing that all the reactions considered are purely peripheral. In particular, it confirms the value we have obtained for the ANC of the 15 C ground state: C 2 1/2 + = 1.59 ± 0.06 fm −1. Our model of 15 C provides also a new estimate of the radiative-capture cross section at astrophysical energy: σ n,γ (23.3 keV) = 4.66 ± 0.14 μb. Conclusions: Including a halo-EFT description of 15 C within precise models of reactions is confirmed to be an excellent way to relate the reaction cross sections and the structure of the nucleus. Its systematic expansion enables us to establish how the reaction process is affected by that structure and deduce which nuclear-structure observables are actually probed in the collision. From this, we can infer valuable information on both the structure of 15 C and its synthesis through the 14 C(n, γ) 15 C radiative capture at astrophysical energies.

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Section: B Breakup Of 15 C On Lead At 68 Mev/nucleonsupporting

confidence: 85%

Section: A Breakup Of 15 C On Lead At 605 Mev/nucleonsupporting

confidence: 67%

Section: B Breakup Of 15 C On Lead At 68 Mev/nucleonmentioning

confidence: 92%

Section: Radiative Capture 14 C(n γ ) 15 Cmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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C15 : From halo effective field theory structure to the study of transfer, breakup, and radiative-capture reactions

2019

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New determination of astrophysical 14C(n, γ)15C reaction rate from the spectroscopic factor of 15C

Pang

et al. 2019

Sci. China Phys. Mech. Astron.

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Proton-and neutron-rich breakups near zero binding energy

Mukeru¹

2021

J. Phys. Commun.

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An analysis of the elastic scattering and breakup cross sections in the 17 F / 17 O + 208 Pb reactions in the zero binding energy limit, is presented. The main motivation was to investigate whether finite reaction observables can be obtained for a neutron-rich system in this limit, where it can be regarded as an open quantum system. It is first found that as the binding energy tends to zero, the ground-state wave function of the 17 O ( 16 O +n) system falls asymptotically as ∼ 1 / r ℓ b (where ℓ b = 2 , is the ground-state orbital angular momentum). For both projectiles, finite elastic scattering and breakup cross sections are obtained in the zero binding energy limit, where they also become insensitive to the variation of the binding energy. For the 17 F projectile, this is due to the core-proton Coulomb barrier, whereas for the 17 O projectile, it is due to the ∼ 1 / r ℓ b asymptotic behavior of the ground-state wave function in this limit. In conclusion, finite reaction observables in the breakup of an open quantum system can be obtained for ℓ b ≥ 2 .

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Reconciling Coulomb breakup and neutron radiative capture

Cited by 10 publications

References 31 publications

C15 : From halo effective field theory structure to the study of transfer, breakup, and radiative-capture reactions

C15 : From halo effective field theory structure to the study of transfer, breakup, and radiative-capture reactions

New determination of astrophysical 14C(n, γ)15C reaction rate from the spectroscopic factor of 15C

Proton-and neutron-rich breakups near zero binding energy

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