Solar neutrino unit
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Solar neutrino unit (SNU) is a new unit defined for convenience, which is more suitable for very low event rates.
In principle there are two ways of detecting solar neutrinos: radiochemical and real time experiments. The principle of radiochemical experiments is the reaction of the form
.
The daughter nucleus's decay is used in the detection. Production rate of the daughter nucleus is given by
where
- Φ is the solar neutrino flux
- σ is the cross section for the radiochemical reaction
- N is the number of target atoms.
With typical neutrino flux of ![10^{10}[\frac{1}{cm^{2}s}]](../../../../math/6/a/a/6aa49b110f34445a2d7ca86cde5de83d.png)
and cross section of about 10 − 45[cm2] it is needed about 1030 (1 mole is equal to 6.022×1023) target atoms to produce one event per day. This number corresponds to ktons of the target substances, whereas present neutrino detectors operate at much lower quantities of those.
1 SNU is equal to 10 − 36 captures per target atom per second.
[edit] See also
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