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2013-11-02T20:50:27Z

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{{Unreferenced|date=December 2006}}
The '''solar neutrino unit''' (SNU) is a unit of Solar neurino flux widely used in [[neutrino astronomy]] and radiochemical neutrino experiments. It is equal to the neutrino flux producing 10−36 captures per target atom per second. It is convenient given the very low event rates in radiochemical experiments.

In principle there are two ways of detecting solar [[neutrino]]s: radiochemical and real time experiments. The principle of radiochemical experiments is the reaction of the form

<math>^{A}_{N}Z + \nu_{e}\longrightarrow^{A}_{N-1}(Z+1)+e^{-}</math>.

The daughter [[Atomic nucleus|nucleus]]'s decay is used in the detection. Production rate of the daughter nucleus is given by
<math>R = N\int\Phi(E)\sigma(E)dE</math>,
where

* <math>\Phi</math> is the solar neutrino [[flux]]
* <math>\sigma</math> is the [[Cross section (physics)|cross section]] for the radiochemical reaction
* <math>N</math> is the number of target atoms.

With typical neutrino flux of 1010 cm−2 s−1 and a typical interaction [[Cross section (physics)|cross section]] of about 10−45 cm2, about 1030 target atoms are required to produce one event per day. Taking into account that 1 [[mole (unit)|mole]] is equal to 6.022{{E|23}} atoms, this number corresponds to [[ton|kton]]s of the target substances, whereas present [[neutrino detector]]s operate at much lower quantities of those.

==See also==
*[[Neutrino]]
*[[Neutrino detector]]
*[[Mole (unit)]]

{{DEFAULTSORT:Solar Neutrino Unit}}
[[Category:Units of frequency]]

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