We present precision measurements of the 3He + 4He →7Be reaction in the range Ec.m. = 0.33 to 1.23 MeV using a small gas cell and detection of both prompt γ rays and 7Be activity. Our prompt and activity measurements are in good agreement within the experimental uncertainty of several percent. We find S(0) = 0.595 ± 0.018 keV b from fits of the Kajino theory to our data. We compare our results ...

We report on observations of redshifted He ii 303.8 ˚ A absorption in the high-redshift QSO HE 2347−4342 (z = 2.885, V = 16.1) with the Goddard High Resolution Spectrograph on board HST in its low resolution mode (△λ = 0.7 ˚ A). With f λ = 3.6 10 −15 erg cm −2 s −1Å −1 at the expected position of He ii 304Å absorption it is the most UV-bright high redshift QSO discovered so far. We show that th...

We have previously described a resonance involving the adiabatic motion of He from a superleak into a reservoir. We consider here the case of He-He mixtures and show some preliminary results for ρs for confinement in a film geometry at L = 0.0483μm. We relate this to the behavior expected from correletion-length scaling.