Ab Initio Prediction of the 4$\mathrm{H}$e($d, γ$)6$\mathrm{L}$i Big Bang Radiative Capture

Hebborn, C.; Hupin, G.; Kravvaris, K.; Quaglioni, S.; Navrátil, P.; Gysbers, P.

doi:10.1103/physrevlett.129.042503

Title: Ab Initio Prediction of the ⁴$$\mathrm{H}$$e($d, γ$)⁶$$\mathrm{L}$$i Big Bang Radiative Capture

Journal Article · Wed Jul 20 00:00:00 EDT 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.129.042503· OSTI ID:1923671

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Facility for Rare Isotope Beams, East Lansing, MI (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Université Paris-Saclay, Orsay (France)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
TRIUMF, Vancouver, BC (Canada); University of British Columbia, Vancouver, BC (Canada)
TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)

We report the rate at which helium (⁴He ) and deuterium (d) fuse together to produce lithium-6 (⁶Li) and a γ ray, ⁴$$\mathrm{H}$$e($d, γ$)⁶$$\mathrm{L}$$i, is a critical puzzle piece in resolving the discrepancy between big bang predictions and astronomical observations for the primordial abundance of ⁶Li . The accurate determination of this radiative capture rate requires the quantitative and predictive description of the fusion probability across the big bang energy window (30 keV ≲ E ≲ 400 keV), where measurements are hindered by low counting rates. We present first-principle (or, ab initio) predictions of the ⁴$$\mathrm{H}$$e($d, γ$)⁶$$\mathrm{L}$$i 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 ⁴He-d scattering dynamics and bound ⁶Li 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.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Laboratory Directed Research and Development (LDRD) Program; National Research Council of Canada

Grant/Contract Number:: SC0013617; AC52-07NA27344; SAPIN-2016-00033; SAPPJ-2019-00039; PGSD3-535536-2019

OSTI ID:: 1923671

Alternate ID(s):: OSTI ID: 1887494

Report Number(s):: LLNL-JRNL-832850; SAPIN-2016-0003; SAPPJ-2019-00039; PGSD3-535536-2019; TRN: US2312452

Journal Information:: Physical Review Letters, Vol. 129, Issue 4; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Ab Initio Prediction of the ⁴$$\mathrm{H}$$e($d, γ$)⁶$$\mathrm{L}$$i Big Bang Radiative Capture