350 citations · 841 across the 15 of their papers we have counts for
12 papers · 1 filter
Bayesian parameter estimation in EFT using Hamiltonian Monte Carlo
Isak Svensson, Andreas Ekström, Christian Forssén
The number of low-energy constants (LECs) in chiral effective field theory (EFT) grows rapidly with increasing chiral order, necessitating the use of Markov chain Monte Carlo te…
Wave-packet continuum discretisation for nucleon-nucleon scattering predictions
Sean B. S. Miller, Andreas Ekström, Christian Forssén
In this paper we analyse the efficiency, precision, and accuracy of computing elastic nucleon-nucleon (NN) scattering amplitudes with the wave-packet continuum discretisation metho…
Rigorous constraints on three-nucleon forces in chiral effective field theory from fast and accurate calculations of few-body observables
S. Wesolowski, I. Svensson, A. Ekström +4
We explore the constraints on the three-nucleon force (3NF) of chiral effective field theory (EFT) that are provided by bound-state observables in the and sectors. O…
Bayesian optimization in ab initio nuclear physics
A. Ekström, C. Forssén, C. Dimitrakakis +5
Theoretical models of the strong nuclear interaction contain unknown coupling constants (parameters) that must be determined using a pool of calibration data. In cases where the mo…
Three-body halo states in effective field theory
Emil Ryberg, Christian Forssén, Lucas Platter
In this paper we study the renormalization of Halo effective field theory applied to the Helium-6 halo nucleus seen as an alpha-neutron-neutron three-body state. We include the 0+…
Constraining Low-Energy Proton Capture on Beryllium-7 through Charge Radius Measurements
Emil Ryberg, Christian Forssén, H. -W. Hammer +1
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.…
An optimized chiral nucleon-nucleon interaction at next-to-next-to-leading order
A. Ekström, G. Baardsen, C. Forssén +8
We optimize the nucleon-nucleon interaction from chiral effective field theory at next-to-next- to-leading order. The resulting new chiral force NNLOopt yields χ^2 \approx 1 per de…
Determining neutron-capture cross sections via the surrogate reaction technique
C. Forssen, F. S. Dietrich, J. Escher +2
Indirect methods play an important role in the determination of nuclear reaction cross sections that are hard to measure directly. In this paper we investigate the feasibility of u…
Large basis ab initio shell model investigation of 9-Be and 11-Be
C. Forssen, P. Navratil, W. E. Ormand +1
We are presenting the first ab initio structure investigation of the loosely bound 11-Be nucleus, together with a study of the lighter isotope 9-Be. The nuclear structure of these…
Analytical approach to electromagnetic processes in loosely bound nuclei: application to 8B
C. Forssen, N. B. Shulgina, M. V. Zhukov
In this paper we develop an analytical model in order to study electromagnetic processes involving loosely bound neutron--rich and proton--rich nuclei. We construct a model wave fu…
Analytical E1 strength functions of two-neutron halo nuclei: 11-Li and 14-Be
C. Forssen, V. D. Efros, M. V. Zhukov
An analytical model, recently developed to study the electromagnetic dissociation (EMD) energy spectra of two-neutron halo nuclei, is applied to 11-Li and 14-Be. We find that a rel…
Analytical E1 strength functions of two-neutron halo nuclei: the 6-He example
C. Forssen, V. D. Efros, M. V. Zhukov
An analytical model is developed to study the spectra of electromagnetic dissociation of two-neutron halo nuclei without precise knowledge about initial and final states. Phenomeno…