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Piksaikin, V.M.; Isaev, S.G.
Two reports: (i) Correlation properties of delayed neutrons from fast neutron induced fission. (ii) Method and set-up for measurements of trace level content of heavy fissionable elements based on delayed neutron counting1998
Two reports: (i) Correlation properties of delayed neutrons from fast neutron induced fission. (ii) Method and set-up for measurements of trace level content of heavy fissionable elements based on delayed neutron counting1998
AbstractAbstract
[en] The experimental studies of the energy dependence of the delayed neutron parameters for various fissioning systems has shown that the behavior of a some combination of delayed neutron parameters (group relative abundances ai and half lives Ti) has a similar features. On the basis of this findings the systematics of delayed neutron experimental data for thorium, uranium, plutonium and americium isotopes have been investigated with the purpose to find a correlation of DN parameters with characteristics of fissioning system as well as a correlation between the delayed neutron parameters themselves. Below we will present the preliminary results which were obtained during this study omitting the physics interpretation of the results. (author)
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Piksaikin, V.M.; Isaev, S.G.; Goverdovski, A.A.; Pshakin, G.M. (Institute of Physics and Power Engineering, Obninsk (Russian Federation)); International Atomic Energy Agency, Vienna (Austria). International Nuclear Data Committee; 24 p; Oct 1998; p. 1-13; 13 refs, 7 figs, 4 tabs
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Report
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Holden, N.E.
Brookhaven National Lab., Upton, NY (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1998
Brookhaven National Lab., Upton, NY (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1998
AbstractAbstract
[en] Spontaneous fission is a phenomenon exhibited by heavy nuclei, which can be a major mode of decay of nuclei of elements heavier than thorium and can be a determining factor in their stability. For purposes of this paper, spontaneous fission will be considered a process in which a nucleus breaks up into two approximately equal parts. The emission of light nuclei or heavy ions such as 12C, 16O, or 32S will not be considered. This radioactive decay mode is often much smaller than the spontaneous fission decay mode, although this is not true in all cases. Barwick noted that this might indicate that the assumed half-life for spontaneous fission of some older experiments might be partially due to heavy fragment radioactivity. Other than taking note of this potential correction to spontaneous fission half-lives, this decay mode of heavy fragment radioactivity will be ignored. Excited states of some heavy nuclei may decay via spontaneous fission. These so-called fission isomers will not be discussed here. Electron capture (EC) or beta-delayed fission is a process in which prompt fission of a sufficiently excited daughter state occurs following population by EC or beta decay. The fission activity will appear to decay with the half-life of the parent and was earlier confused in some cases with SF. This process has been discussed in detail in a review and will not be considered in this paper
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Mar 1998; 6 p; International conference on the physics of nuclear science and technology; Long Island, NY (United States); 5-8 Oct 1998; CONF-981003--; CONTRACT AC02-76CH00016; ALSO AVAILABLE FROM OSTI AS DE98004442; NTIS; INIS; US GOVT. PRINTING OFFICE DEP
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Report
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Conference
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Eismont, V.; Kireev, A.; Ryzhov, I.; Tutin, G.; Blomgren, J.; Conde, H.; Elmgren, K.; Olsson, N.; Rahm, J.; Ramstrom, E.
V.G.Khlopin Radium Institute, St. Petersburg (Russian Federation)
Progress report. January 1997 - December 19981998
V.G.Khlopin Radium Institute, St. Petersburg (Russian Federation)
Progress report. January 1997 - December 19981998
AbstractAbstract
No abstract available
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Kuzminov, B. (ed.); Ministry for Atomic Energy of Russian Federation, Russian Nuclear Data Commission, Institute of Physics and Power Engineering, Obninsk (Russian Federation); International Atomic Energy Agency, International Nuclear Data Committee, Vienna (Austria); 56 p; Dec 1998; p. 5
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Report
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Fomichev, A.V.; Shcherbakov, O.A.; Petrov, G.A.; Laptev, A.B.
V.G.Khlopin Radium Institute, St. Petersburg (Russian Federation)
Progress report. January 1997 - December 19981998
V.G.Khlopin Radium Institute, St. Petersburg (Russian Federation)
Progress report. January 1997 - December 19981998
AbstractAbstract
No abstract available
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Kuzminov, B. (ed.); Ministry for Atomic Energy of Russian Federation, Russian Nuclear Data Commission, Institute of Physics and Power Engineering, Obninsk (Russian Federation); International Atomic Energy Agency, International Nuclear Data Committee, Vienna (Austria); 56 p; Dec 1998; p. 7
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Report
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ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, BARYON REACTIONS, ENERGY RANGE, EVEN-ODD NUCLEI, HADRON REACTIONS, HEAVY NUCLEI, INTERNAL CONVERSION RADIOISOTOPES, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, MINUTES LIVING RADIOISOTOPES, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, RADIOISOTOPES, SPONTANEOUS FISSION RADIOISOTOPES, TARGETS, URANIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
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Lychagin, A.A.; Zhuravlev, B.V.; Trykova, V.I.; Demenkov, V.G.
State Scientific Center, Institute of Physics and Power Engineering, Obninsk (Russian Federation)
Progress report. January 1997 - December 19981998
State Scientific Center, Institute of Physics and Power Engineering, Obninsk (Russian Federation)
Progress report. January 1997 - December 19981998
AbstractAbstract
No abstract available
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Source
Kuzminov, B. (ed.); Ministry for Atomic Energy of Russian Federation, Russian Nuclear Data Commission, Institute of Physics and Power Engineering, Obninsk (Russian Federation); International Atomic Energy Agency, International Nuclear Data Committee, Vienna (Austria); 56 p; Dec 1998; p. 30
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Report
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Vinogradov, Yu.I.; Abramovich, S.N.; Andreev, M.F.; Bol'shakov, Yu.M.
Russian Federal Nuclear Center, VNIIEF, Sarov (Russian Federation)
Progress report. January 1997 - December 19981998
Russian Federal Nuclear Center, VNIIEF, Sarov (Russian Federation)
Progress report. January 1997 - December 19981998
AbstractAbstract
No abstract available
Primary Subject
Source
Kuzminov, B. (ed.); Ministry for Atomic Energy of Russian Federation, Russian Nuclear Data Commission, Institute of Physics and Power Engineering, Obninsk (Russian Federation); International Atomic Energy Agency, International Nuclear Data Committee, Vienna (Austria); 56 p; Dec 1998; p. 37
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Report
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ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, BARYONS, CATIONS, CHARGED PARTICLES, ELEMENTARY PARTICLES, EVEN-EVEN NUCLEI, FERMIONS, FISSION NEUTRONS, HADRONS, HEAVY NUCLEI, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, IONS, ISOTOPES, NEUTRONS, NUCLEAR REACTIONS, NUCLEI, NUCLEONS, RADIOISOTOPES, SPONTANEOUS FISSION RADIOISOTOPES, THORIUM ISOTOPES, URANIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
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Andreev, M.F; Gladkov, V.V.; Zavgorodni, V.A.; Serov, V.I.
Russian Federal Nuclear Center, VNIIEF, Sarov (Russian Federation)
Progress report. January 1997 - December 19981998
Russian Federal Nuclear Center, VNIIEF, Sarov (Russian Federation)
Progress report. January 1997 - December 19981998
AbstractAbstract
No abstract available
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Source
Kuzminov, B. (ed.); Ministry for Atomic Energy of Russian Federation, Russian Nuclear Data Commission, Institute of Physics and Power Engineering, Obninsk (Russian Federation); International Atomic Energy Agency, International Nuclear Data Committee, Vienna (Austria); 56 p; Dec 1998; p. 41
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Report
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ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, AMERICIUM ISOTOPES, DISTRIBUTION, ENERGY RANGE, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, HEAVY ION DECAY RADIOISOTOPES, HEAVY NUCLEI, INTERNAL CONVERSION RADIOISOTOPES, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, MEV RANGE, MINUTES LIVING RADIOISOTOPES, NEON 24 DECAY RADIOISOTOPES, NEPTUNIUM ISOTOPES, NUCLEAR FRAGMENTS, NUCLEAR REACTIONS, NUCLEI, ODD-EVEN NUCLEI, RADIOISOTOPES, SPONTANEOUS FISSION RADIOISOTOPES, THORIUM ISOTOPES, URANIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
[en] An analysis of selected fission fragment angular distributions of various target is made using exact theoretical expressions. Theoretical anisotropies obtained from the transition state model are compared with their corresponding values deduced from the statistical scission model. The nuclear moment of inertia extracted from the model calculations are compared with their estimated values from a microscopic theory, which includes the nuclear pairing interaction. Single particle levels of Nilsson et al. are utilized. It is found that the value of the statistical parameter is very sensitive to the energy gap parameter, Δ. The reduction of energy gap results in an increase in the moment of inertia. The effect of pairing interaction on the inertia parameters are illustrated and discussed
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China Nuclear Data Center, Beijing (China); 136 p; Dec 1998; p. 24-38; 2 tabs., 11 figs. 26 refs.
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Report
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AbstractAbstract
[en] The cumulative fission yields for 45 fission product nuclides of 238U fission induced by neutron of fast reactor spectrum and high energy (around 14.0 MeV) neutron have been evaluated. The results were compared with the ENDF/B-6, JENDL-3/FY, CENDL-FY (86) and JEF-2/FY. It was found that in the total 68 evaluated values, the most of present results (88 percent in total) are in agreement with at least one of the main fission yield libraries within the quoted error limits
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China Nuclear Data Center, Beijing (China); 136 p; Dec 1998; p. 101-109; 2 tabs., 1 ref.
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Report
Literature Type
Numerical Data
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ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, BARYON REACTIONS, DATA, ENERGY RANGE, EVEN-EVEN NUCLEI, HADRON REACTIONS, HEAVY NUCLEI, INFORMATION, ISOTOPES, MATERIALS, MEV RANGE, NUCLEAR REACTION YIELD, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUMERICAL DATA, RADIOACTIVE MATERIALS, RADIOISOTOPES, SPONTANEOUS FISSION RADIOISOTOPES, URANIUM ISOTOPES, YEARS LIVING RADIOISOTOPES, YIELDS
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Enqvist, T.; Benlliure, J.; Farget, F.; Schmidt, K.H.; Armbruster, P.; Bernas, M.; Tassan-Got, L.; Boeckstiegel, C.; Jong, M. de; Dufour, J.P.
Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)1999
Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)1999
AbstractAbstract
[en] Projectile fragmentation and fission, induced in collisions of 238U at 1 A GeV with lead, have systematically been studied. A complete survey on the isotopic production cross sections of all elements between vanadium (Z = 23) and rhenium (Z = 75) down to a cross section of 0.1 mb is given. About 600 isotopes produced in fragmentation and about 600 isotopes produced in fission were identified in the GSI fragment separator FRS from magnetic rigidities, time-of-flight values, and the energy loss in an ionisation chamber. In addition, the velocity distributions of all these reaction products have been mapped, and the products are unambiguously attributed to the different reaction mechanisms due to their kinematical properties. The results are compared with empirical systematics and previous data. The velocity of the fragments obtained in the fission process by the Coulomb repulsion allows to reconstruct the TKE-value of the break-up and to identify the atomic number of the fissioning nucleus in hot fission. The mean velocities of light projectile fragments were found to be higher than the beam velocity. (orig.)
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Mar 1999; 23 p; 41 refs.
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