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- W2040596536 endingPage "054" @default.
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- W2040596536 abstract "We investigate the possibility of detecting solar electron antineutrinos with the KamLAND experiment. These electron antineutrinos are predicted by spin-flavor oscillations at a significant rate even if this mechanism is not the leading solution to the SNP. KamLAND is sensitive to antineutrinos originated from solar ${}^8$B neutrinos. From KamLAND negative results after 145 days of data taking, we obtain model independent limits on the total flux of solar electron antineutrinos $Phi({}^8 B)< 1.1-3.5times 10^4 cm^{-2} s^{-1}$, more than one order of magnitude smaller than existing limits, and on their appearance probability $P<0.15%$ (95% CL). Assuming a concrete model for antineutrino production by spin-flavor precession, this upper bound implies an upper limit on the product of the intrinsic neutrino magnetic moment and the value of the solar magnetic field $mu B< 2.3times 10^{-21}$ MeV 95% CL (for LMA $(Delta m^2, tan^2theta)$ values). Limits on neutrino transition moments are also obtained. For realistic values of other astrophysical solar parameters these upper limits would imply that the neutrino magnetic moment is constrained to be, in the most conservative case, $mulsim 3.9times 10^{-12} mu_B$ (95% CL) for a relatively small field $B= 50$ kG. For higher values of the magnetic field we obtain: $mulsim 9.0times 10^{-13} mu_B$ for field $B= 200$ kG and $mulsim 2.0times 10^{-13} mu_B$ for field $B= 1000$ kG at the same statistical significance." @default.
- W2040596536 created "2016-06-24" @default.
- W2040596536 creator A5045275762 @default.
- W2040596536 date "2003-04-29" @default.
- W2040596536 modified "2023-10-18" @default.
- W2040596536 title "KamLAND bounds on solar antineutrinos and neutrino transition magnetic moments" @default.
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- W2040596536 doi "https://doi.org/10.1088/1126-6708/2003/04/054" @default.
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