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Title: Precision measurement of prompt fission neutron spectra of /sup 235/U, /sup 238/U, and /sup 239/Pu. [0. 10, 0. 18, 0. 53, 2. 07 MeV]

Abstract

Prompt neutron spectra from fission of /sup 235/U, and /sup 239/Pu have been measured at incident neutron energies of 0.10, 0.18, 0.53 and 2.07 MeV. A major effort was made to obtain an accurate experimental determination of the efficiency and energy response function of the time-of-flight neutron detector in the energy range 0.15 to 15 MeV. The spectra have been analytically described by the so called Watt distribution, as well as with a Maxwell distribution. It is shown that the Watt relation gives a somewhat better description of the spectra than the Maxwell formula. The angular correlation between incident-neutrons and fission-neutrons was measured for /sup 235/U and /sup 238/U at an incident neutron energy of 2.07 MeV. The data indicate some slight anisotropies, being rather small or even negligible for /sup 235/U and somewhat more pronounced for /sup 238/U. The results show that the shape of the neutron energy distribution is independent of the angle of observation. 4 figures, 1 table. (auth)

Authors:
 [1]; ; ;
  1. Atomic Energy Co., Studsvik, Sweden
Publication Date:
OSTI Identifier:
7348833
Resource Type:
Conference
Journal Name:
Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States)
Additional Journal Information:
Journal Volume: 425; Conference: Proceedings on nuclear cross section and technology, Washington, DC, USA, 3 Mar 1975; Other Information: See NBS-SPEC.PUBL.--425(Vol.2); CONF-750303--P2
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; NEUTRON REACTIONS; FISSION; PLUTONIUM 239 TARGET; URANIUM 235 TARGET; URANIUM 238 TARGET; ANGULAR CORRELATION; FISSION NEUTRONS; KEV RANGE 100-1000; MEV RANGE 01-10; PROMPT NEUTRONS; BARYON REACTIONS; BARYONS; CORRELATIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; HADRON REACTIONS; HADRONS; KEV RANGE; MEV RANGE; NEUTRONS; NUCLEAR REACTIONS; NUCLEON REACTIONS; NUCLEONS; TARGETS; 652026* - Nuclear Properties & Reactions, A=220 & above, Experimental- Spontaneous & Induced Fission- (-1987)

Citation Formats

Johansson, P I, Holmqvist, B, Wiedling, T, and Jeki, L. Precision measurement of prompt fission neutron spectra of /sup 235/U, /sup 238/U, and /sup 239/Pu. [0. 10, 0. 18, 0. 53, 2. 07 MeV]. United States: N. p., 1975. Web.
Johansson, P I, Holmqvist, B, Wiedling, T, & Jeki, L. Precision measurement of prompt fission neutron spectra of /sup 235/U, /sup 238/U, and /sup 239/Pu. [0. 10, 0. 18, 0. 53, 2. 07 MeV]. United States.
Johansson, P I, Holmqvist, B, Wiedling, T, and Jeki, L. Wed . "Precision measurement of prompt fission neutron spectra of /sup 235/U, /sup 238/U, and /sup 239/Pu. [0. 10, 0. 18, 0. 53, 2. 07 MeV]". United States.
@article{osti_7348833,
title = {Precision measurement of prompt fission neutron spectra of /sup 235/U, /sup 238/U, and /sup 239/Pu. [0. 10, 0. 18, 0. 53, 2. 07 MeV]},
author = {Johansson, P I and Holmqvist, B and Wiedling, T and Jeki, L},
abstractNote = {Prompt neutron spectra from fission of /sup 235/U, and /sup 239/Pu have been measured at incident neutron energies of 0.10, 0.18, 0.53 and 2.07 MeV. A major effort was made to obtain an accurate experimental determination of the efficiency and energy response function of the time-of-flight neutron detector in the energy range 0.15 to 15 MeV. The spectra have been analytically described by the so called Watt distribution, as well as with a Maxwell distribution. It is shown that the Watt relation gives a somewhat better description of the spectra than the Maxwell formula. The angular correlation between incident-neutrons and fission-neutrons was measured for /sup 235/U and /sup 238/U at an incident neutron energy of 2.07 MeV. The data indicate some slight anisotropies, being rather small or even negligible for /sup 235/U and somewhat more pronounced for /sup 238/U. The results show that the shape of the neutron energy distribution is independent of the angle of observation. 4 figures, 1 table. (auth)},
doi = {},
url = {https://www.osti.gov/biblio/7348833}, journal = {Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States)},
number = ,
volume = 425,
place = {United States},
year = {1975},
month = {10}
}

Conference:
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