Wickham Chen, Southern Methodist University, Dallas, TX, 75275. Phone: 214-768-1402. Fax: 214-768-3573. Email: [email protected] Tiankuan Liu, Southern Methodist University, Dallas, TX, 75275. Phone: 214-768-1541. Fax: 214-768-4095. Email: [email protected] Junheng Zhang, Southern Methodist University, Dallas, TX, 75275. Phone: 214-768-1402. Fax: 214-768-3573. Email: [email protected]...

The parameters which characterize the energy distribution of a supersonic helium beam are measured at different source parameters. The data are compared with the results of calculations based on three different He–He interatomic potentials in order to test their ability to describe the helium free jet expansion. This article follows a previous paper where calculations were performed at source t...

The present paper treats application of the EQPET (Electronic Quasi-Particle Expansion Theory) model for TSC (Tetrahedral Symmetric Condensate) of H/D mixed systems for Pd host metal. Production ratios of He/He for multi-body fusion reactions in H/D mixed TSC systems are calculated as a function of H/D mixing rate. The model is further extended to treat direct nuclear interactions between host-...

Due to the immiscibility of He into He at very low temperatures, mixed helium droplets consist of a core of He atoms coated by a He layer whose thickness depends on the number of atoms of each isotope. When these numbers are such that the centrifugal kinetic energy of the He atoms is small and can be considered as a perturbation to the mean-field energy, a novel shell structure arises, with mag...

[1] Apatite He/He thermochronometry has the potential to constrain cooling histories for individual samples provided that several presently untested assumptions are valid. Here we simulate the sensitivity of He/He spectra to assumptions regarding geometric model, crystallographic anisotropy, broken grain terminations, parent nuclide zonation, and the accuracy of results obtained from analyses o...

Measurements of Xe isotope ratios in ocean island basalts (OIB) suggest that Earth’s mantle accreted heterogeneously, and that compositional remnants of accretion are sampled by modern, high-He/He OIB associated with the Icelandic and Samoan plumes. If so, the high-He/He source may also have a distinct oxygen isotopic composition from the rest of the mantle. Here, we test if the major elements ...

We present precision measurements of the 3 He + 4 He → 7 Be 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 7 Be 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 res...