PERSISTENT METASTABLE STATES AND INHIBITED SCINTILLATION OF HE-2

The scintillation of liquid helium produced by α particles has been measured with particular emphasis on the temperature region below 1.25°K which had not been studied previously. An interpretation of the observed inhibition of the scintillation below Tλ is proposed which attributes the effect to a reduced radiative destruction rate of metastable states in He II. © 1969 The American Physical Society.