Direct measurement of the 7Be solar neutrino flux with 192 days of Borexino data
Direct measurement of the 7Be solar neutrino flux with 192 days of Borexino data
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DOI：
10.1103/physrevlett.101.091302
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发表时间：
2008-08-29
影响因子：
8.6
通讯作者：
Zuzel, G.
中科院分区：
文献类型：
--
作者：
Arpesella, C.;Back, H. O.;Zuzel, G.
我们报道了用实验室的Borexino探测器直接测量7Be太阳中微子的信号率。0.862 MeV(7)Be中微子的相互作用速率为49+/-3(STAT)+/-4(SYST)次/(天)。100吨)。(7)Be太阳中微子没有振荡的假设与我们在4sigma C.L.的测量结果不一致。我们的结果是第一次直接测量太阳P在物质增强振荡和真空驱动振荡之间的过渡区的存活几率。这一测量改进了(7)Be、Pp和CNO太阳v(E)通量的实验测定，以及利用太阳中微子对有效中微子磁矩的限制。
We report the direct measurement of the 7 Be solar neutrino signal rate performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso. The interaction rate of the 0.862 MeV (7)Be neutrinos is 49 +/- 3(stat) +/- 4(syst) counts/(day . 100 ton). The hypothesis of no oscillation for (7)Be solar neutrinos is inconsistent with our measurement at the 4 sigma C.L. Our result is the first direct measurement of the survival probability for solar P, in the transition region between matter-enhanced and vacuum-driven oscillations. The measurement improves the experimental determination of the flux of (7)Be, pp, and CNO solar v(e) and the limit on the effective neutrino magnetic moment using solar neutrinos.