Measurement of the rate of νe+d → p+p+e− interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory
Measurement of the rate of νe+d → p+p+e− interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory
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DOI：
10.1134/1.1530292
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发表时间：
2002-12
影响因子：
0.4
通讯作者：
J. Farine
中科院分区：
文献类型：
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作者：
J. Farine
在萨德伯里中微子天文台(SNO)，通过带电电流(CC)反应和电子的弹性散射(ES)，探测到了B衰变产生的太阳中微子。CC反应仅对{nu}{sube}敏感，而ES反应对{nu}{sub{u}}和{nu}{sub{tau}}也有较小的敏感性。由CC反应速率测得的B衰变的通量为：{Phi}{sup CC}({nu}{sube})=[1.75+-}0.07(统计){sup+0.12}{sub0.11}(系统){+-}0.05(理论)]x10{sup 6}cm{sup-2}S{sup-1}。假设没有风味转化，从ES反应速率推断的通量为：{Phi}{sup EC}({Nu}{subx})=[2.39+-}0.34(状态){sup+0.16}{sub0.14}(系统)]x10{sup 6}cm{sup-2}S{sup-1}。假设系统不确定度为正态分布，将{Phi}{sup CC}({nu}{sube})与Super-Kamiokande合作的精确值{Phi}{sup EC}({nu}{subx})进行比较，得到了3.3{sigma}的差异，这为太阳通量中存在非电子性质的活动中微子提供了证据。由此确定活跃的B中微子的总通量为(5.44+-0.99)×10{sup 6}cm{sup-2}S{sup-1}，这与太阳模型的预测十分一致。
Solar neutrinos from the decay of {sup 8}B have been detected at the Sudbury Neutrino Observatory (SNO) via the charged current (CC) reaction on deuterium and by the elastic scattering (ES) of electrons. The CC reaction is sensitive exclusively to {nu}{sub e}, while the ES reaction also has a small sensitivity to {nu}{sub {mu}} and {nu}{sub {tau}}. The flux of {nu}{sub e} from {sup 8}B decay measured by the CC reaction rate is {phi}{sup CC}({nu}{sub e})=[1.75{+-}0.07 (stat.){sup +0.12}{sub -0.11} (syst.){+-}0.05 (theor.)]x10{sup 6}cm{sup -2}s{sup -1}. Assuming no flavor transformation, the flux inferred from the ES reaction rate is {phi}{sup EC}({nu}{sub x})=[2.39{+-}0.34 (stat.) {sup +0.16}{sub -0.14} (syst.)]x10{sup 6} cm{sup -2}s{sup -1}. Comparison of {phi}{sup CC}({nu}{sub e} to the Super-Kamiokande collaboration's precision value of {phi}{sup EC}({nu}{sub x} yields a 3.3{sigma} difference, assuming the systematic uncertainties are normally distributed, providing evidence that there is a nonelectron flavor active neutrino component in the solar flux. The total flux of active {sup 8}B neutrinos is thus determined to be (5.44{+-}0.99)x10{sup 6}cm{sup -2}s{sup -1}, in close agreement with the predictions of solar models.