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Generated by �weak� force during�� p+ n + e+
+
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�Massless� particles which interact poorly with matter
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In that first respect, similar to photons
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Can pass through sun without being absorbed
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Same property makes them very hard to detect
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Davis experiment at Homestake Mine in Black Hills
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100,000 gallon tank of C2Cl4 dry cleaning
fluid
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in Cl nuclei�� n
+ p+ + e-�� so Cl (Z=17) becomes Ar (Z=18)
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Physically separate out the Ar, then wait for it to radioactively
decay
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Saw only 1/3 the neutrinos predicted
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