تقرير
Quantifying uncertainties in neutron-alpha scattering with chiral nucleon-nucleon and three-nucleon forces
| العنوان: | Quantifying uncertainties in neutron-alpha scattering with chiral nucleon-nucleon and three-nucleon forces |
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| المؤلفون: | Kravvaris, Konstantinos, Quinlan, Kevin R., Quaglioni, Sofia, Wendt, Kyle A., Navratil, Petr |
| المصدر: | Phys. Rev. C 102, 024616 (2020) |
| سنة النشر: | 2020 |
| المجموعة: | Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Theory |
| الوصف: | Background: Modern ab initio theory combined with high-quality nucleon-nucleon (NN) and three-nucleon (3N) interactions from chiral effective field theory (EFT) can provide a predictive description of low-energy light-nuclei reactions relevant for astrophysics and fusion-energy applications. However, the high cost of computations has so far impeded a complete analysis of the uncertainty budget of such calculations. Purpose: Starting from NN potentials up to fifth order (N4LO) combined with leading-order 3N forces, we study how the order-by-order convergence of the chiral expansion and confidence intervals for the 3N contact and contact-plus-one-pion-exchange low-energy constants (cE and cD) contribute to the overall uncertainty budget of many-body calculations of neutron-He elastic scattering. Methods: We compute structure and reaction observables for three-, four- and five-nucleon systems within the ab initio frameworks of the no-core shell model an no-core shell model with continuum. Using a small set of design runs, we construct a Gaussian process model (GPM) that acts as a statistical emulator for the theory. With this, we gain insight into how uncertainties in the 3N low-energy constants propagate throughout the calculation and determine the Bayesian posterior distribution of these parameters with Markov-Chain Monte-Carlo. Comment: 12 pages, 11 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.102.024616 |
| URL الوصول: | http://arxiv.org/abs/2004.08474 |
| رقم الأكسشن: | edsarx.2004.08474 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.102.024616 |
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