Nondegenerate Regime Research Articles

Some properties of a high density electron‐hole plasma in Hg1−xCdxTe

Picosecond infrared techniques have been used to probe the time‐varying transmission and reflection coefficients at 10.6 μm of a nonequilibrium electron‐hole gas in Hg1−xCdxTe (x = 0.3 and 0.2) at peak densities of approximately 1×1019 cm−3. Observed recombination times are much longer than those predicted by extrapolations based on conventional theory of Auger recombination in the nondegenerate density regime.

Density of dilute 3He-4He solutions

The number density of dilute 3He-4He solutions under saturated vapor pressure is calculated within the framework of quantum hydrodynamics. For temperatures T small compared to the 3He Fermi temperature T F, results are given for 3He concentrations large enough to manifest 3He quasiparticle interactions. The nondegenerate regime (T≫T F) is also considered in the limit of small 3He concentration. Relevance to experimental determination of quasiparticle energies and interactions is emphasized.

Neutrino luminosity by the ordinary URCA process in an intense magnetic field

The neutrino luminosity by the ordinary URCA process in a strongly magnetized electron gas is computed. General formulae are presented for the URCA energy loss rates for an arbitrary degree of degeneracy. Analytic expressions are derived for a completely degenerate, relativistic electron plasma in the special case of neutron-proton conversion. Numerical results are given for more general cases. The main results are as follows: the URCA energy loss rates are drastically reduced for the regime of great degeneracy by a factor up to 10−3 for Θ≅1, andT 9≲10, where Θ=H/H q ,H q =m 2 c 3/eh=4.414×1013 G. In the non-degenerate regime the neutrino luminosity is enhanced approximately linearly with Θ for the temperature range 1≲T 9≲10. Possible applications to white dwarfs and neutron stars are briefly discussed.