Ab Initio Prediction of the 4$$\mathrm{H}$$e($d, γ$)6$$\mathrm{L}$$i Big Bang Radiative Capture
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Michigan State Univ., East Lansing, MI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- 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
- OSTI Identifier:
- 1923671
- Alternate Identifier(s):
- OSTI ID: 1887494
- Report Number(s):
- LLNL-JRNL-832850
Journal ID: ISSN 0031-9007; SAPIN-2016-0003; SAPPJ-2019-00039; PGSD3-535536-2019; TRN: US2312452
- Grant/Contract Number:
- SC0013617; AC52-07NA27344; SAPIN-2016-00033; SAPPJ-2019-00039; PGSD3-535536-2019
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 129; Journal Issue: 4; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; big bang nucleosynthesis; cluster models; nuclear many-body theory; nuclear reactions; radiative capture
Citation Formats
Hebborn, C., Hupin, G., Kravvaris, K., Quaglioni, S., Navrátil, P., and Gysbers, P. Ab Initio Prediction of the 4$\mathrm{H}$e($d, γ$)6$\mathrm{L}$i Big Bang Radiative Capture. United States: N. p., 2022.
Web. doi:10.1103/physrevlett.129.042503.
Hebborn, C., Hupin, G., Kravvaris, K., Quaglioni, S., Navrátil, P., & Gysbers, P. Ab Initio Prediction of the 4$\mathrm{H}$e($d, γ$)6$\mathrm{L}$i Big Bang Radiative Capture. United States. https://doi.org/10.1103/physrevlett.129.042503
Hebborn, C., Hupin, G., Kravvaris, K., Quaglioni, S., Navrátil, P., and Gysbers, P. Wed .
"Ab Initio Prediction of the 4$\mathrm{H}$e($d, γ$)6$\mathrm{L}$i Big Bang Radiative Capture". United States. https://doi.org/10.1103/physrevlett.129.042503. https://www.osti.gov/servlets/purl/1923671.
@article{osti_1923671,
title = {Ab Initio Prediction of the 4$\mathrm{H}$e($d, γ$)6$\mathrm{L}$i Big Bang Radiative Capture},
author = {Hebborn, C. and Hupin, G. and Kravvaris, K. and Quaglioni, S. and Navrátil, P. and Gysbers, P.},
abstractNote = {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.},
doi = {10.1103/physrevlett.129.042503},
journal = {Physical Review Letters},
number = 4,
volume = 129,
place = {United States},
year = {Wed Jul 20 00:00:00 EDT 2022},
month = {Wed Jul 20 00:00:00 EDT 2022}
}
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