Ab Initio Prediction of the <math display="inline"><mrow><mmultiscripts><mrow><mi>He</mi></mrow><mprescripts/><none/><mrow><mn>4</mn></mrow></mmultiscripts><mo stretchy="false">(</mo><mi>d</mi><mo>,</mo><mi>γ</mi><mo stretchy="false">)</mo><mmultiscripts><mrow><mi>Li</mi></mrow><mprescripts/><none/><mrow><mn>6</mn></mrow></mmultiscripts></mrow></math> Big Bang Radiative Capture - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2022

Ab Initio Prediction of the He4(d,γ)Li6 Big Bang Radiative Capture

Chloë Hebborn
  • Fonction : Auteur
Konstantinos Kravvaris
  • Fonction : Auteur
Sofia Quaglioni
  • Fonction : Auteur
Petr Navrátil
  • Fonction : Auteur
Peter Gysbers
  • Fonction : Auteur

Résumé

The rate at which helium (He4) and deuterium (d) fuse together to produce lithium-6 (Li6) and a γ ray, He4(d,γ)Li6, is a critical puzzle piece in resolving the discrepancy between big bang predictions and astronomical observations for the primordial abundance of Li6. The accurate determination of this radiative capture rate requires the quantitative and predictive description of the fusion probability across the big bang energy window (30keVE400keV), where measurements are hindered by low counting rates. We present first-principle (or, ab initio) predictions of the He4(d,γ)Li6 astrophysical S factor using validated nucleon-nucleon and three-nucleon interactions derived within the framework of chiral effective field theory. By employing the ab initio no-core shell model with continuum to describe He4-d scattering dynamics and bound Li6 product on an equal footing, we accurately and consistently determine the contributions of the main electromagnetic transitions driving the radiative capture process. Our results reveal an enhancement of the capture probability below 100 keV owing to previously neglected magnetic dipole (M1) transitions and reduce by an average factor of 7 the uncertainty of the thermonuclear capture rate between 0.002 and 2 GK.

Dates et versions

hal-03635047 , version 1 (08-04-2022)

Identifiants

Citer

Chloë Hebborn, Guillaume Hupin, Konstantinos Kravvaris, Sofia Quaglioni, Petr Navrátil, et al.. Ab Initio Prediction of the He4(d,γ)Li6 Big Bang Radiative Capture. Physical Review Letters, 2022, 129 (4), pp.042503. ⟨10.1103/PhysRevLett.129.042503⟩. ⟨hal-03635047⟩
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