Results 231 to 240 of about 82,136 (272)

Helium Production in Mixed-Spectrum Fission Reactors

1989
Total helium production measurements in mixed-spectrum reactors are being used to test the helium production cross-section evaluations used for fusion reactor materials calculations, and to provide dosimetry input for reactor neutron spectrum characterization.
DW Kneff, LR Greenwood, BM Oliver, RP Skowronski   +3 more
openaire   +1 more source

Prompt fission neutron multiplicity and spectrum evaluation

AIP Conference Proceedings, 2005
The prompt fission neutron multiplicity and spectrum for spontaneous fission and neutron induced reactions in the energy range of the first chance fission threshold are evaluated using the “point by point” approach that takes into account all possible fragmentations of the fissioning nucleus, the multi‐modal concept of fission and the most probable ...
openaire   +1 more source

Multiplicity spectrum of leakage neutrons from fissionable materials

Annals of Nuclear Energy, 1987
Abstract An asymptotic solution of the multi group Kolmogorov equation for a subcritical system has been obtained. The solution yields the Multiplicity Spectrum (MS) of leakage neutrons from the system. This is an extension of the method proposed earlier for calculating the MS in 9 Be.
S.B. Degweker, A. Sinha
openaire   +1 more source

The value of ν for fission spectrum induced and spontaneous fission of 238U

Journal of Nuclear Energy. Part A. Reactor Science, 1960
The effective value of nu for U/sup 238/ fission induced by a fission spectrum of fast neutrons was measured by the scattering technique and, much more accurately, by the coincidence technique. The result for the ratio of nu /sub 238// nu /sub 235/ (thermal) agreed with earlier values of comparable precision reported in the literature, and, when ...
Rudolph Sher, Jean Leroy
openaire   +1 more source

Evaluation of Uncertainties of 235U Fission Spectrum

1985
This paper presents a first attempt of uncertainty evaluation for the 235U fission spectrum. The covariance matrix, in 15 energy groups, has been obtained from fission rate measurements performed in Mbl cavity in collaboration between NBS and SCK/CEN.
M. Petilli, D. M. Gilliam
openaire   +1 more source

The β Spectrum Following Fission from ²⁵²Cf

1987
The β spectrum from the fission products of 252Cf has been measured using a flat-field magnetic spectrometer. The active entrance aperture to the magnetic field region consisted of an annular plastic scintillator to veto slit scattering and a thin wire chamber to signal electrons on a good trajectory.
openaire   +1 more source

Quantum Tunneling Spectrum and Application to Cold Fission

1994
Tunneling is essentially a quantum process standing at the basis of important applications in electronics, chemistry, biology and nuclear physics. In principle, we can conceive it as a transition from a “localized” state Ψo of the compound nucleus to a state Ψ i of the reaction channel.
E. Stefanescu, A. Sandulescu
openaire   +1 more source

Neutron spectrum of248Cm spontaneous fission

Soviet Atomic Energy, 1991
O. I. Batenkov, M. V. Blinov, A. B. Blinov, A. S. Krivokhatskii, B. M. Aleksandrov   +4 more
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Representation of the Fission Spectrum and Multiplication Calculations

1992
We investigated the different representations of the fission process as total fission on one hand and as the sum of direct fission, first chance fission, second, third and fourth chance fission on the other hand (MT = 18 versus MT = 19, 20, 21 and 38 in ENDF terminology).
R. L. Perel, J. J. Wagschal
openaire   +1 more source

Gamma-ray spectrum of short lived fission products

British Journal of Applied Physics, 1962
The fission products from uranium-235 irradiated by slow neutrons have been analysed using a gamma-ray scintillation spectrometer. The spectra between 40 minutes and 40 hours after irradiation for 30 seconds have been recorded and twelve major activities identified.
openaire   +1 more source