| 1. |
- RYBERG, EMIL, 1987, et al.
(författare)
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Constraining low-energy proton capture on beryllium-7 through charge radius measurements
- 2014
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Ingår i: European Physical Journal A. - : Springer Science and Business Media LLC. - 1434-601X .- 1434-6001. ; 50:11, s. 170-182
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we point out that a measurement of the charge radius of boron-8 provides indirect access to the S-factor for radiative proton capture on beryllium-7 at low energies. We use leading-order halo effective field theory to explore this correlation and we give a relation between the charge radius and the S-factor. Furthermore, we present important technical aspects relevant to the renormalization of point-like P -wave interactions in the presence of a repulsive Coulomb interaction.
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| 2. |
- RYBERG, EMIL, 1987, et al.
(författare)
-
Effective field theory for proton halo nuclei
- 2014
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Ingår i: Physical Review C - Nuclear Physics. - 2469-9985 .- 2469-9993. ; 89:1
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Tidskriftsartikel (refereegranskat)abstract
- We use halo effective field theory to analyze the universal features of proton halo nuclei bound due to a large S-wave scattering length. Our work provides a fully field-theoretical treatment of bound halo nuclei in the presence of a repulsive Coulomb interaction. With a Lagrangian built from effective core and valence-proton fields, we derive a leading-order expression for the charge form factor. Within the same framework we also calculate the radiative proton capture cross section. We present general results at leading order that can be applied to any one-proton halo system bound in a relative S wave. We illustrate the method by studying the excited 1/2(+) state of fluorine 17, for which we give results for the charge radius and the astrophysical S factor.
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| 3. |
- RYBERG, EMIL, 1987, et al.
(författare)
-
Range corrections in proton halo nuclei
- 2016
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Ingår i: Annals of Physics. - : Elsevier BV. - 0003-4916 .- 1096-035X. ; 367, s. 13-32
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Tidskriftsartikel (refereegranskat)abstract
- We analyze the effects of finite-range corrections in halo effective field theory for S-wave proton halo nuclei. We calculate the charge radius to next-to-leading order and the astrophysical S-factor for low-energy proton capture to fifth order in the low energy expansion. As an application, we confront our results with experimental data for the S-factor for proton capture on Oxygen-16 into the excited 1/2(+) state of Fluorine-17. Our low-enegrgy theory is characterized by a systematic low-energy expansion, which can be used to quantify an energy-dependent model error to be utilized in data fitting. Finally, we show that the existence of proton halos is suppressed by the need for two fine tunings in the underlying theory.
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