File(s) not publicly available
Salty neutrinos from the sun: Results from the salt phase of the Sudbury Neutrino Observatory
The Sudbury Neutrino Observatory is a 1 ktonne heavy-water Cerenkov detector. The first phase of this experiment has shown that neutrinos from the Sun change flavour. For the second phase of the experiment, approximately 2 tonnes of salt ( NaCl) was added to the heavy water to enhance the neutral-current detection as well as the neutral-current and charged-current separability. Here the results are presented from the complete salt phase at the Sudbury Neutrino Observatory. The electron energy spectrum is presented for the first time. It is consistent with an undistorted 8B spectral shape. It is also consistent with the Large Mixing Angle (LMA) parameters obtained through a global fit including the data presented in this paper. These parameters are found to be ?m2 = (8.0+0.6-0.4)×10-5eV^2 and ? = 33.9+2.4-2.2 degrees. The total flux of active-flavour neutrinos from 8B decay in the Sun is found to be 4.94+0.21-0.21(stat)+0.38-0.34(syst), whereas the integral flux of electron neutrinos for an undistorted 8B spectrum is 1.68+0.0.6-0.06(stat)+0.08-0.09(syst), both in units of 106cm^-2 s^-1. The day-night asymmetry in the observed fluxes is consistent with both absence of matter-enhancement effects in the Earth and with the small level of these effects expected for the LMA model as stated above.
History
Publication status
- Published
Journal
The European Physical Journal A: Hadrons and NucleiISSN
1434-6001Publisher
Springer VerlagExternal DOI
Issue
S1Volume
27Page range
17-23Pages
7.0Event name
The European Physical Journal A - Hadrons and NucleiEvent location
Paris, FranceEvent type
conferenceDepartment affiliated with
- Physics and Astronomy Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC