# Phase space analysis of an interacting fermi gas

TL;DR: The concept of momentum anisotropy in the phase space of a system of interacting particles interconnects the momentum deformation with the nuclear interaction energy and deduces an expression for the single particle level density of the system.

Abstract: The concept of momentum anisotropy in the phase space of a system of interacting particles interconnects the momentum deformation with the nuclear interaction energy and deduces an expression for the single particle level density of the system. Using our RGM interactions, our predictions compare favourably with the experimental level density parameters.

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TL;DR: In this article, energy partition in fission is reconsidered for 236 U in the RGM-PES model with explicit linear momentum conservation for fission up to about 25 MeV excitation.

Abstract: Energy partition in fission is reconsidered for 236 U in our RGM-PES model with explicit linear momentum conservation for fission up to about 25 MeV excitation. Several qualitative differences with our earlier predictions are pointed out. There is need of specific experiments to verify them.

3 citations

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01 Jan 1974TL;DR: In this article, a brief survey of published experimental work is given of the production of plasma produced from solid targets by pulsed CO2 laser radiation and it is noted that at the highest laser powers presently available, experimental results are not consistent with existing theories.

Abstract: A brief survey of published experimental work is given of the production of plasma produced from solid targets by pulsed CO2 laser radiation. It is noted that at the highest laser powers presently available, experimental results are not consistent with existing theories. It is shown that three dimensional heat flow effects are important. The theory is modified to take these into account and reasonable agreement is found between the limited experimental data and the modified model.

1 citations

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TL;DR: On the basis of the liquid drop model of atomic nuclei, an account of the mechanism of nuclear fission is given in this article, where conclusions are drawn regarding the variation from nucleus to nucleus of the critical energy required for fission, and regarding the dependence of fission cross section for a given nucleus on energy of the exciting agency.

Abstract: On the basis of the liquid drop model of atomic nuclei, an account is given of the mechanism of nuclear fission. In particular, conclusions are drawn regarding the variation from nucleus to nucleus of the critical energy required for fission, and regarding the dependence of fission cross section for a given nucleus on energy of the exciting agency. A detailed discussion of the observations is presented on the basis of the theoretical considerations. Theory and experiment fit together in a reasonable way to give a satisfactory picture of nuclear fission.

1,281 citations

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774 citations

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TL;DR: In this article, a treatment from a theoretical point of view is given for different aspects of the statistical model and nuclear level densities. But the authors do not consider the nuclear phase transition.

Abstract: A treatment from a theoretical point of view is given for the different aspects of the statistical model and nuclear level densities. General features of nuclear level densities, including angular momentum and parity distributions, are discussed. Several models for their description are given including the equidistant spacing model, the free gas model, the Newton-Cameron model, the Rosenzweig effect, the Newson model, the pairing model, and the nuclear phase transition. The shell model without pairing interactions seemed to provide an adequate description of the neutron binding energy with empirical values of the single-particle spacing. Qualitative considerations, formal solution of classical approximation, and special limits of the statistical model and angular momentum conservation are discussed. The evaporation approximation, inverse cross sections, multiple emission of particles, emission of complex particles, statistical fission, lifetime of the compound state, and fluctuation of cross sections and angular distributions are also discussed. (M.C.G.)

725 citations

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TL;DR: In this paper, the liquid-drop model of fission has been studied with the use of an electronic calculator, the Eniac, for many shapes not all near-spherical.

Abstract: The liquid-drop model of fission as developed by Bohr and Wheeler and others has been studied with the use of an electronic calculator, the Eniac. Classical deformation energies have been calculated for many shapes not all near-spherical. The shapes considered were axially and primarily, but not exclusively, bilaterally symmetric, and single-valued in polar representation. Previous calculations are confirmed and extended. Agreement with observed fission thresholds and spontaneous fission rates is obtained. No explanation of asymmetric fission is found.

100 citations

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TL;DR: In this paper, the authors examined the possibility that the asymmetrization in low energy nuclear fission may take place after the system, in evolving along its reaction path, has passed the symmetric saddle.

Abstract: The possibility is examined, on the liquid drop-model, that the asymmetrization in the low energy nuclear fission may take place after the system, in evolving along its reaction path, has passed the symmetric saddle. The energy surface is investigated beyond the symmetric saddles both by extrapolating well-known formulae, valid in the small deformation range, and by using a representation in which the energy of shapes slightly different from an arbitrarily prolated basic ellipsoid may be calculated. The results obtained seem to indicate that along the effective symmetric reaction path there exists an « inversion » point, beyond which, in the case of incipient motion, a small asymmetric deformation would tend to grow.

65 citations