2003/05/31 by John N. Bahcall, John N Bahcall, Carlos Pena-Garay +1 · 3 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Flux (metallurgy) #Luminosity #Measurements of neutrino speed #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics research studies #Solar neutrino #Solar neutrino problem #Standard solar model #astro-ph #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1088/1126-6708/2003/11/004
published as JHEP 0311:004,2003 · Updated all calculations to include SNO salt-phase data and improved GNO and SAGE data, all released September 7, 2003 at TAUP03. Updating produces only minor numerical changes. Accepted for publication in JHEP
arxiv created 2003/10/10 · openalex publication_date 2003/11/04 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
We analyze all available solar and related reactor neutrino experiments, as well as simulated future 7Be, p-p, pep, and 8B solar neutrino experiments. We treat all solar neutrino fluxes as free parameters subject to the condition that the total luminosity represented by the neutrinos equals the observed solar luminosity (the `luminosity constraint'). Existing experiments show that the p-p solar neutrino flux is 1.02 +- 0.02 (1 sigma) times the flux predicted by the BP00 standard solar model; the 7Be neutrino flux is 0.93+0.25-0.63 the predicted flux; and the 8B flux is 1.01 +- 0.04 the predicted flux. The neutrino oscillation parameters are: Delta m2 = 7.3+0.4-0.6× 10-5 eV2 and tan2 theta12 = 0.41 +- 0.04. We evaluate how accurate future experiments must be to determine more precisely neutrino oscillation parameters and solar neutrino fluxes, and to elucidate the transition from vacuum-dominated to matter-dominated oscillations at low energies. A future 7Be nu-e scattering experiment accurate to +- 10 % can reduce the uncertainty in the experimentally determined 7Be neutrino flux by a factor of four and the uncertainty in the p-p neutrino flux by a factor of 2.5 (to +- 0.8 %). A future p-p experiment must be accurate to better than +- 3 % to shrink the uncertainty in tan2 theta12 by more than 15 %. The idea that the Sun shines because of nuclear fusion reactions can be tested accurately by comparing the observed photon luminosity of the Sun with the luminosity inferred from measurements of solar neutrino fluxes. Based upon quantitative analyses of present and simulated future experiments, we answer the question: Why perform low-energy solar neutrino experiments?