Solar neutrino results in Super-Kamiokande-III
Solar neutrino results in Super-Kamiokande-III
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DOI：
10.1103/physrevd.83.052010
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发表时间：
2011-03-24
影响因子：
5
通讯作者：
Wilkes, R. J.
中科院分区：
文献类型：
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作者：
Abe, K.;Hayato, Y.;Wilkes, R. J.
介绍了超级神冈太阳中微子测量第三阶段的结果，并与第一和第二阶段的结果进行了比较。通过改进的探测器校准、完整的探测器模拟和改进的分析方法，总中微子通量的系统不确定性估计为+/-2.1%，约为超级神冈第一阶段系统不确定性的三分之二。在5.0至20 MeV总电子能量区域内观测到的B-8太阳通量为2.32 +/- 0.04（stat）+/- 0.05（sys）x 10（6）cm（-2）sec（-1），这与以前的测量结果一致。利用SK-Ⅰ、Ⅱ和Ⅲ的数据进行了组合振荡分析，并将结果与其它太阳中微子实验结果相结合。得到的最佳拟合振荡参数为sin（2）θ（12）= 0.30（-0.01）（+/-0.02）（tan（2）θ（12）= 0.42（-0.02）（+0.04））和Δ m（21）（2）= 6.2（-1.9）（+1.1）× 10（-5）eV（2）。结合KamLAND结果，发现最佳拟合振荡参数为sin（2）theta（12）= 0.31 +/- 0.01（tan（2）theta（12）= 0.44 +/- 0：03）和Delta m（21）（2）= 7.6 +/- 0.2 x 10（-5）eV（2）。从全球太阳中微子实验中得到的B-8中微子通量为5.3 +/- 0.2（stat + sys）x 10（6）cm（-2）s（-1），而加入KamLAND结果后，B-8中微子通量变为5.1 +/- 0.1（stat + sys）x 10（6）cm（-2）s（-1）。在结合所有太阳中微子实验的三味分析中，sin（2）θ（13）的上限在95% C. L.时为0.060。在与KamLAND结果结合之后，发现sin（2）θ（13）的上限在95%C. L.处为0.059。
The results of the third phase of the Super-Kamiokande solar neutrino measurement are presented and compared to the first and second phase results. With improved detector calibrations, a full detector simulation, and improved analysis methods, the systematic uncertainty on the total neutrino flux is estimated to be +/- 2.1%, which is about two thirds of the systematic uncertainty for the first phase of Super-Kamiokande. The observed B-8 solar flux in the 5.0 to 20 MeV total electron energy region is 2.32 +/- 0.04(stat) +/- 0.05(sys) x 10(6) cm(-2) sec(-1) under the assumption of pure electron-flavor content, in agreement with previous measurements. A combined oscillation analysis is carried out using SK-I, II, and III data, and the results are also combined with the results of other solar neutrino experiments. The best-fit oscillation parameters are obtained to be sin(2)theta(12) = 0.30(-0.01)(+/- 0.02)(tan(2)theta(12) = 0.42(-0.02)(+0.04)) and Delta m(21)(2) = 6.2(-1.9)(+1.1) x 10(-5) eV(2). Combined with KamLAND results, the best-fit oscillation parameters are found to be sin(2)theta(12) = 0.31 +/- 0.01(tan(2)theta(12 =) 0.44 +/- 0: 03) and Delta m(21)(2) = 7.6 +/- 0.2 x 10(-5) eV(2). The B-8 neutrino flux obtained from global solar neutrino experiments is 5.3 +/- 0.2(stat + sys) x 10(6) cm(-2) s(-1), while the B-8 flux becomes 5.1 +/- 0.1(stat + sys) x 10(6) cm(-2) s(-1) by adding KamLAND results. In a three-flavor analysis combining all solar neutrino experiments, the upper limit of sin(2)theta(13) is 0.060 at 95% C.L.. After combination with KamLAND results, the upper limit of sin(2)theta(13) is found to be 0.059 at 95% C.L.