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Title: On the mass eigenstate purity of Boron-8 solar neutrinos

Abstract

We give a brief report on our recent paper, Ref. [1], in which we calculate the {nu}{sub 2} mass eigenstate purity of {sup 8}B solar neutrinos as 91 {+-} 2%.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
879105
Report Number(s):
FERMILAB-CONF-05-580-T
arXiv eprint number hep-ph/0601208; TRN: US0701170
DOE Contract Number:
AC02-76CH03000
Resource Type:
Conference
Resource Relation:
Journal Name: AIP Conf.Proc.842:889-891,2006; Conference: To appear in the proceedings of Particles and Nuclei International Conference (PANIC 05), Santa Fe, New Mexico, 24-28 Oct 2005
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BORON 8; EIGENSTATES; NUCLEI; SOLAR NEUTRINOS; Phenomenology-HEP

Citation Formats

Parke, Stephen J., /Fermilab, Nunokawa, Hiroshi, /Rio de Janeiro, Pont. U. Catol., Zukanovich Funchal, Renata, and /Sao Paulo U.. On the mass eigenstate purity of Boron-8 solar neutrinos. United States: N. p., 2006. Web.
Parke, Stephen J., /Fermilab, Nunokawa, Hiroshi, /Rio de Janeiro, Pont. U. Catol., Zukanovich Funchal, Renata, & /Sao Paulo U.. On the mass eigenstate purity of Boron-8 solar neutrinos. United States.
Parke, Stephen J., /Fermilab, Nunokawa, Hiroshi, /Rio de Janeiro, Pont. U. Catol., Zukanovich Funchal, Renata, and /Sao Paulo U.. Sun . "On the mass eigenstate purity of Boron-8 solar neutrinos". United States. doi:. https://www.osti.gov/servlets/purl/879105.
@article{osti_879105,
title = {On the mass eigenstate purity of Boron-8 solar neutrinos},
author = {Parke, Stephen J. and /Fermilab and Nunokawa, Hiroshi and /Rio de Janeiro, Pont. U. Catol. and Zukanovich Funchal, Renata and /Sao Paulo U.},
abstractNote = {We give a brief report on our recent paper, Ref. [1], in which we calculate the {nu}{sub 2} mass eigenstate purity of {sup 8}B solar neutrinos as 91 {+-} 2%.},
doi = {},
journal = {AIP Conf.Proc.842:889-891,2006},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

Conference:
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  • 91 {+-} 2% of {sup 8}Boron solar neutrinos observed by SNO are {nu}{sub 2} mass eigenstates.
  • We calculate the fraction of B{sup 8} solar neutrinos that arrive at the Earth as a nu{sub 2} mass eigenstate as a function of the neutrino energy. Weighting this fraction with the B{sup 8} neutrino energy spectrum and the energy dependence of the cross section for the charged current interaction on deuteron with a threshold on the kinetic energy of the recoil electrons of 5.5 MeV, we find that the integrated weighted fraction of nu{sub 2}'s to be 91 {+-} 2 % at the 95% CL. This energy weighting procedure corresponds to the charged current response of the Sudbury Neutrinomore » Observatory (SNO). We have used SNO's current best fit values for the solar mass squared difference and the mixing angle, obtained by combining the data from all solar neutrino experiments and the reactor data from KamLAND. The uncertainty on the nu{sub 2} fraction comes primarily from the uncertainty on the solar delta m{sup 2} rather than from the uncertainty on the solar mixing angle or the Standard Solar Model. Similar results for the Super-Kamiokande experiment are also given. We extend this analysis to three neutrinos and discuss how to extract the modulus of the Maki-Nakagawa-Sakata mixing matrix element U{sub e2} as well as place a lower bound on the electron number density in the solar B{sup 8} neutrino production region.« less
  • We give a brief report on our recent paper in which we calculate the {nu}2 mass eigenstate purity of 8B solar neutrinos as 91{+-}2%.
  • The results of detailed two-flavor MSW calculations are presented for solar /sup 8/B neutrinos. The probabilities for solar neutrinos to remain electron neutrinos at earth are calculated as functions of energy, ..delta..m/sup 2/, and sin/sup 2/2theta, and the results are presented in both graphical form and numerical form. The numerical results are contained on an IBM PC compatible floppy diskette which also contains the /sup 8/B spectrum. Thus all of the data can be combined to predict results for any detector scheme. 4 refs., 28 figs.
  • The statistical requirement for any directional /sup 8/B solar neutrino experiment with an initially large background to signal ratio (about 1000) indicates the need for extremely large detectors. However, this dector scale can be decreased substantially if the detector mass can be made radioactively clean so that only external backgrounds remain. Then the detector can be operated in a self-shielding mode. Among a number of detector options, the water Cherenkov approach being used in the search for proton decay satisfies these requirements. With the neutrino deuteron reaction via the use of heavy water rather than light water, the background tomore » signal ratio can be further improved and one can demonstrate observation of the /sup 8/B solar neutrino much before one can demonstrate its directionality.« less