Comparison of Van Allen Probes radiation belt proton data with test particle simulation for the 17 March 2015 storm: PROTON LOSS
- PAR ID:
- 10036158
- Publisher / Repository:
- Wiley Blackwell (John Wiley & Sons)
- Date Published:
- Journal Name:
- Journal of Geophysical Research: Space Physics
- Volume:
- 121
- Issue:
- 11
- ISSN:
- 2169-9380
- Page Range / eLocation ID:
- 11,035 to 11,041
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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Abstract We calculate the S -factor for proton–proton fusion using chiral effective field theory interactions and currents. By performing order-by-order calculations with a variety of chiral interactions that are regularized and calibrated in different ways, we assess the uncertainty in the S -factor from the truncation of the effective field theory expansion and from the sensitivity of the S -factor to the short-distance axial current determined from three- and four-nucleon observables. We find that S (0) = (4.100 ± 0.024(syst) ± 0.013(stat) ± 0.008( g A )) × 10 −23 MeV fm 2 , where the three uncertainties arise, respectively, from the truncation of the effective field theory expansion, use of the two-nucleon axial current fit to few-nucleon observables and variation of the axial coupling constant within the recommended range. The increased value of S (0) compared to previous calculations is mainly driven by an increase in the recommended value for the axial coupling constant and is in agreement with a recent analysis based on pionless effective field theory.more » « less
