On gradient-induced instabilities

Newton, R. H. C.; Short, DJ

doi:10.1088/0305-4470/6/5/019

Cited by 8 publications

(8 citation statements)

References 2 publications

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“…Given these restrictions, we focus on an impressive data set measured by the Australian National University (ANU) nuclear reactions group in the 1980's where fission/residue/fusion cross sections and prescission neutron emission data were obtained as a function of oxygen and fluorine projectile energy for a wide range of compound nuclear masses. The A CN =175-220 data from this systematic experimental investigation [10,58,76,77] are displayed in Fig. 37, along with some additional data for the same reactions obtained by others [78,79].…”

Section: A Analysis Of Cross Section and Neutron Emission Datamentioning

confidence: 83%

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Statistical model of heavy-ion fusion-fission reactions

2009

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Cross-section and neutron-emission data from heavy-ion fusion-fission reactions are consistent with the fission of fully equilibrated systems with fission lifetime estimates obtained via a Kramers-modified statistical model which takes into account the collective motion of the system about the ground state, the temperature dependence of the location and height of fission transition points, and the orientation degree of freedom. If the "standard" techniques for calculating fission lifetimes are used, then the calculated excitation-energy dependence of fission lifetimes is incorrect. We see no evidence to suggest that the nuclear viscosity has a temperature dependence. The strong increase in the nuclear viscosity above a temperature of ~1.3 MeV deduced by others is an artifact generated by an inadequate fission model. DOI: PACS number(s) : 24.75.+i, 24.60.Ky, 25.70. ER fus ER fus f J J J J J ⎛ − + = J J J J T

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Section: A Analysis Of Cross Section and Neutron Emission Datamentioning

confidence: 83%

“…By changing some of the assumptions used to obtain Eq. (77), the cusp about the spherical shape can be made larger or removed without changing the results at large deformation. However, Eq.…”

Section: Orientation Degree Of Freedommentioning

confidence: 99%

Statistical model of heavy-ion fusion-fission reactions

2009

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“…This model is also suitable for determining the pre-fission neutron multiplicity if the calculated lifetimes are long compared to the dynamically constrained fission lifetime. Several groups have invested an extensive effort in measuring the number of emitted neutrons associated with fission reactions induced by heavy ions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The measurement of emitted neutrons is usually limited to the measurement of pre-scission neutron multiplicity, post-scission neutron multiplicity, and therefore total neutron multiplicity.…”

Section: Introductionmentioning

confidence: 99%

Pre-saddle neutron multiplicity for fission reactions induced by heavy ions and light particles

Soheyli

Khalili

2013

Phys. Rev. C

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Pre-saddle neutron multiplicity has been calculated for several fission reactions induced by heavy ions and light particles. Experimentally, it is impossible to determine the contribution of neutrons being emitted before the saddle point and those emitted between the saddle and the scission points.Determination of the pre-saddle neutron multiplicity in our research is based on the comparison between the experimental anisotropies and those predicted by the standard saddle-point statistical model. Analysis of the results shows that the pre-saddle neutron multiplicity depends on the fission barrier height and stability of the compound nucleus. In heavy ion induced fission, the number of pre-saddle neutrons decreases with increasing the excitation energy of the compound nucleus.A main cause of this behavior is due to a reduction in the ground state-to-saddle point transition time with increasing the excitation energy of the compound nucleus. Whereas in induced fission by light particles, the number of pre-saddle neutrons increases with increasing the excitation energy of the compound nucleus.

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“…The interaction between the electron streams and various waves present in an inhomogeneous system have aroused great interest because under certain conditions amplification or generation of various types of waves, both electromagnetic [13][14][15] and acoustic is easily possible in such system [16,17]. Guha et al have analyzed the theory of acoustic wave amplification in an inhomogeneous semiconductor [17,18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Density Gradient on the Acousto-Electric Wave Instability in Ion-Implanted Semiconductor Plasmas

Ghosh

Khare

2006

Acta Phys. Pol. A

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Using hydrodynamic model of inhomogeneous plasma, an analytical investigation of excitation of acousto-electric mode was made in n-type piezoelectric ion-implanted semiconductor plasma. By employing the multi-fluid balance equations along with the elastic and Maxwell equations, a compact dispersion relation for the cases in which colloidal grains are either stationary (ϑ 0d = 0) or streaming (ϑ 0d = 0) is derived. We find that the choice of homogeneous medium is favorable in achieving higher acoustic gain per radian and the results of the investigation should be useful in understanding the characteristics of longitudinal acousto-electric wave in ion-implanted piezoelectric semiconductor whose main constituents are electrons and negatively charged colloidal particles.

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On gradient-induced instabilities

Cited by 8 publications

References 2 publications

Statistical model of heavy-ion fusion-fission reactions

Statistical model of heavy-ion fusion-fission reactions

Pre-saddle neutron multiplicity for fission reactions induced by heavy ions and light particles

Effect of Density Gradient on the Acousto-Electric Wave Instability in Ion-Implanted Semiconductor Plasmas

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