Simultaneous precision spectroscopy of pp , Be7 , and pep solar neutrinos with Borexino Phase-II
Simultaneous precision spectroscopy of pp , Be7 , and pep solar neutrinos with Borexino Phase-II
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DOI：
10.1103/physrevd.100.082004
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发表时间：
2017-07
影响因子：
5
通讯作者：
M. Agostini;K. Altenmüller;S. Appel;V. Atroshchenko;Z. Bagdasarian;D. Basilico;G. Bellini;J. Benzig
中科院分区：
文献类型：
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作者：
M. Agostini;K. Altenmüller;S. Appel;V. Atroshchenko;Z. Bagdasarian;D. Basilico;G. Bellini;J. Benzig
我们提出了第一个同时测量的相互作用率的$pp$，$^7$Be，和$pep$太阳中微子进行了全球拟合Borexino数据在扩展的能量范围（0.19-2.93）$\，$MeV。该结果是通过分析1291.51 $\，$days的Borexino Phase-II数据获得的，这些数据是在广泛的闪烁体净化活动后于2011年12月至2016年5月收集的。我们发现：率（$pp$）$\，$=$\，$$134 $$\，$$\pm $\，$$10 $\，$（$stat$）$\，$$^{\rm +6}_{\rm -10}$$\，$（$sys$）$\，$cpd/100 $\，$t，率（$^7$Be）$\，$=$\，$$48.3 $\，$$\pm $\，$$1.1 $\，$（$stat$）$\，$$^{\rm +0.4}_{\rm -0.7}$$\，$（$sys$）$\，$cpd/100 $\，$t，和费率（$pep$）$\，$=$\，$2.43$$\pm $\，$0.36 $$\，$（$stat$）$^{+0.15}_{-0.22}$$\，$（$sys$）$\，$cpd/100 $\，$t。这些数字与我们之前测量的精度一致并提高了精度。特别是，以前所未有的2.7%的精确度测量了Be的相互作用率，这表明区分高金属丰度和低金属丰度太阳模型现在主要是由理论不确定性主导的。第一次在超过5 $\，$\sigma $的情况下拒绝了$pep$中微子的存在。上限为8.1 $$\，$cpd/100 $\，$t（95%$\，$C.L.）通过在拟合中对$pp$和$pep$中微子速率之间的比率设置额外的约束，可以获得CNO中微子速率。该极限与Borexino Phase-I获得的极限具有相同的意义（目前提供了对该分量的最严格限制），但通过对$pep$ $\nu$通量应用较不严格的约束获得。
We present the first simultaneous measurement of the interaction rates of $pp$, $^7$Be, and $pep$ solar neutrinos performed with a global fit to the Borexino data in an extended energy range (0.19-2.93)$\,$MeV. This result was obtained by analyzing 1291.51$\,$days of Borexino Phase-II data, collected between December 2011 and May 2016 after an extensive scintillator purification campaign. We find: rate($pp$)$\,$=$\,$$134$$\,$$\pm$$\,$$10$$\,$($stat$)$\,$$^{\rm +6}_{\rm -10}$$\,$($sys$)$\,$cpd/100$\,$t, rate($^7$Be)$\,$=$\,$$48.3$$\,$$\pm$$\,$$1.1$$\,$($stat$)$\,$$^{\rm +0.4}_{\rm -0.7}$$\,$($sys$)$\,$cpd/100$\,$t, and rate($pep$)$\,$=$\,$$2.43$$\pm$$\,$$0.36$$\,$($stat$)$^{+0.15}_{-0.22}$$\,$($sys$)$\,$cpd/100$\,$t. These numbers are in agreement with and improve the precision of our previous measurements. In particular, the interaction rate of $^7$Be $\nu$'s is measured with an unprecedented precision of 2.7%, showing that discriminating between the high and low metallicity solar models is now largely dominated by theoretical uncertainties. The absence of $pep$ neutrinos is rejected for the first time at more than 5$\,$$\sigma$. An upper limit of $8.1$$\,$cpd/100$\,$t (95%$\,$C.L.) on the CNO neutrino rate is obtained by setting an additional constraint on the ratio between the $pp$ and $pep$ neutrino rates in the fit. This limit has the same significance as that obtained by the Borexino Phase-I (currently providing the tightest bound on this component), but is obtained by applying a less stringent constraint on the $pep$ $\nu$ flux.