Weak proton capture on 3He

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dc.creatorMarcucci, L. E.
dc.creatorSchiavilla, R.
dc.creatorViviani, M.
dc.creatorKievsky, A.
dc.creatorRosati, S.
dc.creatorBeacom, J. F.
dc.date2000-06-05
dc.date.accessioned2026-07-07T10:54:32Z
dc.date.available2026-07-07T10:54:32Z
dc.descriptionThe astrophysical S-factor for the proton weak capture on 3He is calculated with correlated-hyperspherical-harmonics bound and continuum wave functions corresponding to realistic Hamiltonians consisting of the Argonne v14 or Argonne v18 two-nucleon and Urbana-VIII or Urbana-IX three-nucleon interactions. The nuclear weak charge and current operators have vector and axial-vector components, that include one- and many-body terms. All possible multipole transitions connecting any of the p 3He S- and P-wave channels to the 4He bound state are considered. The S-factor at a p 3He center-of-mass energy of 10 keV, close to the Gamow-peak energy, is predicted to be 10.1 10^{-20} keV b with the AV18/UIX Hamiltonian, a factor of about 4.5 larger than the value adopted in the standard solar model. The P-wave transitions are found to be important, contributing about 40 % of the calculated S-factor. The energy dependence is rather weak: the AV18/UIX zero-energy S-factor is 9.64 10^{-20} keV b, only 5 % smaller than the 10 keV result quoted above. The model dependence is also found to be weak: the zero-energy S-factor is calculated to be 10.2 10^{-20} keV b with the older AV14/UVIII model, only 6 % larger than the AV18/UIX result. Our best estimate for the S-factor at 10 keV is therefore (10.1 \pm 0.6) 10^{-20} keV b, when the theoretical uncertainty due to the model dependence is included. This value for the calculated S-factor is not as large as determined in fits to the Super-Kamiokande data in which the hep flux normalization is free. However, the precise calculation of the S-factor and the consequent absolute prediction for the hep neutrino flux will allow much greater discrimination among proposed solar neutrino oscillation solutions.
dc.description54 pages RevTex file, 6 PostScript figures, submitted to Phys. Rev. C
dc.identifierhttps://arxiv.org/abs/nucl-th/0006005
dc.identifierhttp://arxiv.org/abs/nucl-th/0006005
dc.identifierPhys.Rev.C63:015801,2001
dc.identifierdoi:10.1103/PhysRevC.63.015801
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/185830
dc.subjectNuclear Theory
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleWeak proton capture on 3He
dc.typetext

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