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Tritium β decay and proton-proton fusion in pionless effective field theory

Journal Article · · Physical Review. C

The Gamow-Teller and Fermi matrix elements, GT and F , respectively, for tritium β decay are calculated to next-to-leading order (NLO) in pionless effective field theory in the absence of Coulomb interactions and isospin violation giving the leading order predictions GT 0 = 0.9807 and F 0 = 1 . Using an experimentally determined value for the tritium β decay GT matrix element, the two-body axial current low energy constant is fixed at NLO yielding L 1 , A = 6.01 ± 2.08 fm 3 at the renormalization scale of the physical pion mass, which agrees with predictions based on naive dimensional analysis. The impact of L 1 , A on proton-proton fusion is also discussed. Finally, the consequences of Wigner-SU(4) spin-isospin symmetry are considered for the Gamow-Teller matrix element.

Published by the American Physical Society 2024
Research Organization:
Duke Univ., Durham, NC (United States); Ohio Univ., Athens, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
FG02-05ER41368; FG02-93ER40756
OSTI ID:
2438110
Alternate ID(s):
OSTI ID: 2579243
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 110; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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