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A very high ratio gas compression device based on liquid metal conical implosion is described in this paper, which can reach a compression ratio up to 10. This device can produce extremely high density, high pressure, and high temperature, thermally equilibrated states by rapid but continuous compression of gaseous materials. The changes in the state parameters (temperature, pressure, density, radiation, line emission, Doppler broadening, dissociation, ionization) of the compressed material can be monitored over a very wide temperature range up to a million Kelvin. Potential applications of the device include many research fields such as chemical molecule property analyses, high density plasma production, high pressure physics, molecular and atomic physics, intermediate density nuclear fusion, sonoluminescence, etc. [ABSTRACT FROM AUTHOR]

A technique for controlled hydrodynamic compression of gases using a conical cavity driven by liquid metal was proposed by Lei (2016) as a convenient, low-cost, repetitive instrument to achieve a very high compression ratio of up to $$10^9$$ . If the compression is fully adiabatic, such compression will raise the gas temperature by a factor of $$10^6$$ for monoatomic gases. In this paper, we develop a 0-D semi-analytic model to examine in detail the adiabatic assumption, taking into account in particular the physical processes of dissociation, ionization, radiation, and energy exchange between the compressed gas and the wall, and provide an assessment of the temperature of the gas or plasma that may be attainable using the technique. The numerical results show that these physical processes drastically lower the temperature attainable. Nevertheless, the results still indicate that final gas temperature of more than 10 eV, and volume-compression-ratio more than $$10^6$$ , are still attainable that might enable a number of interesting applications. The modeling results also revealing some interesting effects of partially ionized gases under high ratio of compression. [ABSTRACT FROM AUTHOR]

The difference in the bandhead moments of inertia between the superdeformed (SD) band194Hg(1) and the two-quasiparticle SD bands194Hg(2, 3) was investigated using the particle-number-conserving treatment for the cranked shell model Hamiltonian. and the pairing interaction strength in SD nuclei is estimated to be much weaker than that in normally deformed nuclei. [ABSTRACT FROM AUTHOR]