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14. europhysics conference on nuclear physics: rare nuclear decays and fundamental processes; Bratislava (Czechoslovakia); 22-26 Oct 1990; Abstracts of invited and contributed papers.
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[en] Light charged particle emission from 252Cf has been investigated with silicon detector telescopes with the purpose to observe possible spontaneous emission of mesons. Upper limits for the branching of this process are obtained in the range 10-8, for meson energy interval from 1.6 to 9.5 MeV. (authors)
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7 refs.
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[en] The precise measurement of the standard neutron spectrum from spontaneous fission of 252Cf requires the optimum experimental arrangement corresponding to the energy range to be measured. The most important requirements to be met in a 252Cf(sf) neutron spectrum measurement, are summarized briefly. Theoretical models for the calculation of fission neutron spectra are based on the predominant emission mechanism, i.e., the evaporation from fully accelerated fragments. Some approaches which were studied in the framework of both the Weisskopf formalism and the Hauser-Feshbach theory are discussed. The results of new Cf spectrum calculations are compared with recent experimental data which confirm a Maxwellian spectrum at energies below ∼ 1 MeV for T=1.42 MeV. Between 1.5 and 4 MeV, measured data tend to exceed this Maxwellian by about 3%. Significant deviations from a Maxwellian with T=1.42 MeV appear between 6 and 20 MeV where a fit of experimental data yields a value of T close to 1.37 MeV. Recent theoretical calculations of the Cf neutron spectrum agree very good with measured data. Especially, the complex cascade evaporation model permits a conformable description of recent experimental data in the whole energy range (1 keV-20 MeV) if introducing the centre-of-mass system anisotropy of emission. (author). 7 figs., 46 refs
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Kristiak, J.; Betak, E. (eds.); 443 p; 1986; p. 322-343; VEDA; Bratislava (Czechoslovakia); 4. international symposium on neutron induced reactions; Smolenice (Czechoslovakia); 17-21 Jun 1985
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Mouze, G.; Ythier, C.
International workshop on dynamical aspects of nuclear fission. Programme and abstracts1991
International workshop on dynamical aspects of nuclear fission. Programme and abstracts1991
AbstractAbstract
[en] Published in summary form only
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Slovenska Akademia Vied, Bratislava (Czechoslovakia). Fyzikalny Ustav; 41 p; Jun 1991; vp; International workshop on dynamical aspects of nuclear fission; Smolenice (Czechoslovakia); 17-21 Jun 1991
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AbstractAbstract
[en] Abstract only. 1 ref
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14. europhysics conference on nuclear physics: rare nuclear decays and fundamental processes; Bratislava (Czechoslovakia); 22-26 Oct 1990; Abstracts of invited and contributed papers.
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Journal Article
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AbstractAbstract
[en] The unusual background observed experimentally in the (ΔE,E) energy region below that characteristic of the LRA's emission from 257F is interpreted as being produced by the negative pions emitted in the spontaneous fission of 257Fm. If this interpretation is correct then the inferred yield for the negative pionic nuclear radioactivity is: Γπ/ΓSF = (1.2±0.1) 10-3.(authors)
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[en] Nuclear emulsions were irradiated in the presence of 252Cf source at a total spontaneous fission number of 9.66* 106. Upper limits for pion emission in the range 10-7, depending on the pion energy, were derived. (authors)
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20 refs.
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Bucurescu, D.; Brehui, M.; Ion, D.B.; Petrascu, M.; Topor, V.; Haiduc, M.; Ion-Mihai, R.; Petrascu, C.; Tolstov, K.
Central Inst. of Physics, Bucharest (Romania)1987
Central Inst. of Physics, Bucharest (Romania)1987
AbstractAbstract
[en] Nuclear emulsions were irradiated in the presence of a 252Cf source at a total spontaneous fission number of 9.66 106. Upper limits for pion emission in the range 10-7, depending on the pion energy were derived. (authors)
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Apr 1987; 4 p
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AbstractAbstract
No abstract available
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Slovenska Akademia Vied, Bratislava (Czechoslovakia). Fyzikalny Ustav; 37 p; Jun 1985; p. 20; 4. international symposium on neutron induced reactions; Smolenice (Czechoslovakia); 17-21 Jun 1985; Published in summary form only.
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Chalupka, A.; Malek, L.; Tagesen, S.; Boettger, R.
Progress report 1985 of Institute for Radium Research and Nuclear Physics (IRK) of the Austrian Academy of Sciences1986
Progress report 1985 of Institute for Radium Research and Nuclear Physics (IRK) of the Austrian Academy of Sciences1986
AbstractAbstract
No abstract available
Source
Wild, E.; Dirniger, G. (eds.); Oesterreichische Akademie der Wissenschaften, Vienna. Inst. fuer Radiumforschung und Kernphysik; 55 p; 1986; p. 31-33; Published in summary form only.
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