PURPOSE To assess the usefulness of hyperpolarized helium (3He) MRI, including apparent diffusion coefficient measurements, in the detection and evaluation of radiation-induced lung injury in rats. METHODS AND MATERIALS Female Fischer-344 rats were treated to the right lung with fractionated dose of 40 Gy (5 x 8 Gy) using 4-MV photons. Conventional proton (1H) and hyperpolarized (3He) MRI wer...

We use the Green Bank Telescope to search for $^3He^+$ emission from a sample of four Galactic planetary nebulae: NGC 3242, 6543, 6826, and 7009. During era primordial nucleosynthesis light elements $^2H$, $^3He$, $^4He$, $^7Li$ were produced in significant amounts these abundances have since been modified primarily by stars. Observations H II regions located throughout Milky Way disk reveal ve...

There are several classes of homogeneous Fermi systems that are characterized by the topology of the energy spectrum of fermionic quasiparticles: (i) gapless systems with a Fermi surface, (ii) systems with a gap in their spectrum, (iii) gapless systems with topologically stable point nodes (Fermi points), and (iv) gapless systems with topologically unstable lines of nodes (Fermi lines). Superfl...

The isotopes 2H and 3He have been identified in low-energy cosmic rays during solar-quiet periods from 1973 January to 1974 October. These observations, made with the Caltech Electron/ Isotope Spectrometer on IMP-7, cover the energy intervals 5-29 MeV per nucleon for 2H and 7-50 MeV per nucleon for 3He. We find that the energy spectra oflH, 2H, and 3He all fall rapidly with decreasing energy, g...

in this article, we have calculated some thermodynamic properties for a system consisting of singy ionized 3he atoms and their corresponding removed electrons by employing the second quantization method at finite temperature. to perform the calculations, we have considered the kinetic term, and coulomb interaction between the particles in our hamiltonian. the calculated properties are free ener...

We review recent experiments in which superfluid 3He has been studied under highly controlled confinement in nanofluidic sample chambers. We discuss the experimental challenges and their resolution. These methods open the way to a systematic investigation of the superfluidity of 3He films, and the surface and edge excitations of topological superfluids.

A direct, high-resolution measurement from lunar orbit of the location of high concentrations of 3He in the lunar regolith is needed for the initiation of cost-effective mining operations on the moon. Gamma-ray spectroscopy has been successfully used to map the abundances and distributions of certain elements present in planetary regoliths. Helium-3 is unique among these elements since the gamm...

The structure of the electronically excited states of 3He and 4He clusters is investigated using fluorescence excitation spectroscopy. Distinct bands are observed energetically close to atomic 1s-ns, nd, np transitions and attributed to perturbed excited He atomiclike states with different principle and orbital quantum numbers. The line shifts and widths of the bands of 3He and 4He clusters of ...

Small weakly bound boson-fermion 4He(m) 3He(n) clusters formed in a free jet expansion are identified using nondestructive transmission grating diffraction. The observations confirm the existence of more than 11 very tenuous complexes including the three-body halo molecule 4He2 3He and the pseudo-Borromean complex 4He2 3He2. Effective cluster formation temperatures, extracted from a sudden free...