No abstract available

[en] A mechanism for neutron emission from deuterated metals is proposed, which is based on some known phenomena, concerning hydrogen precipitation in supersaturated metals. Transient electric fields are assumed to produce energetic deuterons and hence neutrons from D(d,n)³He reactions. The mechanism predicts neutron yields compatible with those reported in some of the experiments and implies a certain degree of experimental irreproducibility

[en] Li pellet conditioning in TFTR results in a reduction of the edge electron density which allows increased neutral beam penetration, central heating, and fueling. Consequently the temperature profiles became more peaked with higher central Ti, Te, and neutron emission rates.

[en] Neutron emission in fission is usually described in terms of two observables: the energy spectrum of emitted neutrons N(E) and the average number of neutrons emitted per fission, or average neutron multiplicity, /bar v/p. These observables are measured before the residual fission fragments decay toward the valley of β stability and are therefore referred to as the prompt neutron spectrum N(E) and the average prompt neutron multiplicity /bar v/p. They are of fundamental importance to the design of macroscopic systems that are driven by the fission reaction, such as thermal or fast reactors. It is the purpose of this paper to describe existing theoretical models for these two observables. Other observables for neutron emission in fission will not be described here due to space limitations. 12 refs., 2 figs

[en] Neutron experimental distributions are investigated in the spontaneous fission of ²⁵²Cf. It is well known that during the fission process the bulk of prompt neutrons is evaporated by the fully accelerated fragments. Neutron evaporation theory states that this emission is isotropic in the centre of mass of each moving fragments (C.M.), but if one compares experimental angular distributions with a pure isotropic evaporation, discrepancies appear in many different works. To understand the origin of these deviations a contribution was introduced to neutron angular distributions due to neutrons ejected at an early stage of the fission process, at the scission point. But even by adding these scission neutrons and taking into account the anisotropy effect due to the kinematic focusing, an excess of neutrons remains. So it was assumed that an anisotropy effect appears also in the C.M. of each fragment and this effect reinforces the kinematic anisotropy in the laboratory system. There are theoretical arguments and calculations that claim that this anisotropy exists, but there isn't any direct observation, because the contribution to the kinematic focusing due to the C.M. anisotropy is very weak. To show this effect a new method has been developed by our collaboration. The CORA experiment was performed for this purpose. It consists in the measurement of triple coincidences between the coincidence of the two fission fragments and two ejected neutrons. With this trick we can disentangle in the laboratory system the contribution to the anisotropy due to the kinematic focusing and the effect of the predicted C.M. anisotropy. The experiment, which gives access for the first time to both processes simultaneously, scission neutron emission and dynamical anisotropy, is described and the new analysis method and the results are presented. This document is made up of an abstract and the slides of the presentation. (authors)

[en] A reproducible radiation of neutron and tritium being the products of cold fusion with thermocycling ferroelectric single crystals bear the Curie point

No abstract available

No abstract available

[en] Neutron intensities, the spatial origin of the neutron emission, and the neutron energy spectra have been measured for PLT plasmas heated by deuterium neutral beams with Esub(beam)=25 to 41 keV. In these low-to-moderate density experiments [nsub(e)(0) approximately <5x10¹³ cm^-3], the neutron emission is highly peaked on axis. Up to 10¹² D-D neutrons per 0.1-s pulse have been obtained, which is 2 orders of magnitude greater than previously achieved in tokamak plasmas. The measured neutron intensity (up to 1x10¹³ n/s) is in reasonable agreement with predictions of a 1-D theoretical model for neutron production from beam-target and beam-beam reactions, over a range of beam power from 0.2 to 1.1 MW

[en] Plasmas produced in focus devices constructed at the Central Institute of Physics, Bucharest, have been investigated with the aims of determining the structure and parameters of the plasma sheath in the axial acceleration and radial collapse stages, and the relationship between neutron production and energetic ion generation. Magnetic probes and optical spectroscopy have been used to study the plasma sheath. A direct energy analysis performed on the plasma ions, coupled with hard X-ray and neutron measurements, provided information on the possible mechanism of neutron generation. It is concluded that neutron generation in low-energy plasma focus devices is due to a beam-target interaction mechanism. (author)