Time-frequency analysis of data from the GALLEX and GNO solar neutrino experiments shows that some features in power-spectrum analyses of those datasets are due to aliasing. We normalize data for each of the four experiments in the GALLEX series, concatenate the resulting normalized data, and then form time-frequency displays. We also form time-frequency displays of the two principal modulations found in the data, at 11.87 yr-1 and at 13.63 yr-1, and of the datasets formed by subtracting these modulations from the actual (normalized) data. The results suggest that the true modulation is that at 11.87 yr-1, consistent with the results of our earlier analysis of Homestake solar neutrino data. Comparison with helioseismology data indicates that modulation is occurring either in the radiative zone just below the tachocline, presumably by the RSFP (resonant spin-flavor precession) process, or in the core, presumably due to inhomogeneities and fluctuations in the nuclear-burning process.
Joint Time-Series Analysis of Homestake and GALLEX-GNO Solar Neutrino Data: Evidence for Rieger-Type Periodicities and their Interpretation as R-Mode Oscillations
Analysis of solar neutrino problem by means of Nötzold and Nakagawa's approach including the interference term- Hyperbolic-tangent profile for electron density in the sun and exact solution -
Three Generation Long-wavelength Vacuum Oscillation Solution to the Solar Neutrino Problem
我们研究了太阳中微子问题的长波真空振荡解的现状,以及第三个中微子的存在对长波真空振荡解的影响和修正程度。假设引起这种振荡的较小质量平方差$Δm^2_{12}$在$10^{-11}-10^{-8}$ eV $^2$范围内,较大质量平方差$Δm^2_{23}$在与大气中微子观测相关的范围内,我们分析了最近的太阳中微子数据来自Homestake,SAGE,GALLEX,GNO和超级神冈实验的三代中微子的背景下。我们包括在我们的真空振荡分析的MSW效应在太阳,这是相关的一些参数空间仔细检查。作为一个极端的练习,我们还进行了没有Homestake数据的拟合。虽然我们发现MSW效应基本上不影响最佳拟合参数,但它显著地修改了大于$\sim 3 \times 10^{-10}$ eV $^2$的$Δm^2_{12}$的允许参数空间,与A.弗里德兰在两代人的情况下。%虽然第三个中微子的存在并不能从本质上改善拟合的质量,但太阳中微子数据本身可以给出$θ_{13}$的上限,在95% C. L.时,该上限被限制为小于$\sim 60^\circ$。
Homestake, Gallex and GNO data reveal variability of the solar neutrino flux. Kamiokande records for 1996-2001 reveal oscillations at 9.43 and 12.6 yr$^{-1}$, well within a range (6-16 yr$^{-1}$) that, according to helioseismology, may be related to internal solar rotation. A nuclear-decay experiment at Brookhaven National Laboratory (for 1982-86) reveals strong oscillations at 11.2 and 13.2 yr$^{-1}$. Similar oscillations are found in nuclear-decay measurements conducted by A. Parkhomov. By contrast, S. Pomme points out that nuclear-decay experiments at standards laboratories tend not to exhi…