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Observed xenon scintillation contour plot of direct images at (a) and at (b) . The is located at the bottom of each plot. They are qualitatively similar, but the higher xenon density at increases the xenon-electron interactions per unit distance, leading to a larger gradient of the optical intensity in (b).
Optical intensity profile at , as indicated by sectional arrows in Fig. 1. Line shows result from Spencer’s theory using isotropic angular distribution of decay.
Spectra at 20, 50, and . Insets show less prominent peaks between 890 and . Six peaks are labeled by the letters at the top of the figure.
Spectral lines identified between 810 and (Ref. 20).
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