Experience with di-potassium 2-amino-6, 8-naphthalene-disulphonic acid as a wavelength shifter in a water Cherenkov detector

Results are reported on the use of the di-potassium salt of 2-amino-6, 8-naphthalene-disulphonic acid as a wavelength shifter in a water Cherenkov detector. No unusual or exceptional precautions were taken in preparing the radiator. All results are consistent with an increase in light output of ∼3.8 when using the wavelength shifter, without any detectable contribution from scintillation phenomena.