Extended Data Fig. 2: Typical γ-ray spectrum taken at proton beam energy Ep = 395 keV. | Nature

Extended Data Fig. 2: Typical γ-ray spectrum taken at proton beam energy Ep = 395 keV.

From: The baryon density of the Universe from an improved rate of deuterium burning

Extended Data Fig. 2

In blue is the γ-ray spectrum obtained with the deuterium gas target at P = 0.3 mbar (the peaks from the D(p,γ)3He reaction are broadened by the Doppler effect at this higher beam energy). In grey is the beam-induced background spectrum (acquired with an inert 4He gas target) due to the 19F contaminant (see text). Its contribution was subtracted leading to net counts on the full-energy peak with a statistical uncertainty of 0.9%. Both spectra are normalized to the integrated beam current.

Source data

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