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9 results on '"fission probabilities"'

1. Experimental set-up for the simultaneous measurement of fission and [formula omitted]-emission probabilities induced by transfer or inelastic-scattering reactions.

Author

Pérez Sánchez, R., Jurado, B., Marini, P., Aiche, M., Czajkowski, S., Denis-Petit, D., Ducasse, Q., Mathieu, L., Tsekhanovich, I., Henriques, A., Méot, V., and Roig, O.

Subjects
*NEUTRON emission, *PROBABILITY theory, *INELASTIC scattering, *LIGHT scattering, *HEAVY nuclei, *GERMANIUM detectors
Abstract

Fission and γ -emission probabilities induced by transfer or inelastic scattering reactions with light projectile nuclei are very valuable quantities for constraining the models that describe the de-excitation of heavy nuclei. We have developed an experimental set-up that allows us to simultaneously measure fission and γ -emission probabilities. The measurement of the γ -emission probability at excitation energies where the fission channel is open is challenging due to the intense background of γ rays emitted by the fission fragments. We discuss the procedure to subtract such a background and the constraints that this subtraction and other experimental conditions put on the set up. We show that our set-up complies with these constraints. [ABSTRACT FROM AUTHOR]

Published
2019
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2. Determination of the 233Pa(n,f) reaction cross section from 0.5 to 10 MeV neutron energy using the transfer reaction 232Th(3He,p)234Pa.

Author

Petit, M., Aiche, M., Barreau, G., Boyer, S., Carjan, N., Czajkowski, S., Dassié, D., Grosjean, C., Guiral, A., Haas, B., Karamanis, D., Misicu, S., Rizea, C., Saintamon, F., Andriamonje, S., Bouchez, E., Gunsing, F., Hurstel, A., Lecoz, Y., and Lucas, R.

Subjects
*PARTICLES (Nuclear physics), *COLLISIONS (Nuclear physics), *NUCLEAR fission, *DISTRIBUTION (Probability theory)
Abstract

The fission probability distributions of 232,233,234Pa and 231Th have been measured up to an excitation energy of 15 MeV, using the transfer reactions 232Th(3He,t)232Pa, 232Th(3He,d)233Pa, 232Th(3He,p)234Pa and 232Th(3He,4He)231Th. From these measurements, the neutron induced fission cross sections of 231Pa, 233Pa and 230Th have been determined from the product of the fission probabilities of 232Pa, 233Pa and 231Th respectively with the calculated compound nucleus formation cross sections in the 231Pa+n, 233Pa+n and 230Th+n reactions. The validity of the applied method has been successfully tested with the existing neutron induced fission cross sections of 230Th and 231Pa. Special emphasis is put on the 233Pa(n,f) reaction which is of importance for thorium fueled nuclear reactors. Based on a statistical model analysis of the neutron induced fission cross section as a function of neutron energy, it has been possible to determine the barrier parameters of the 234Pa fissioning nucleus. Cross sections for the compound nucleus inelastic scatttering 233Pa(n,n′) and radiative capture 233Pa(n,γ) reactions have also been calculated and compared with recent evaluations. [Copyright &y& Elsevier]

Published
2004
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3. Experimental set-up for the simultaneous measurement of fission and $\gamma$ -emission probabilities induced by transfer or inelastic-scattering reactions

Author

Pérez Sánchez, R., Jurado, B., Marini, P., Aiche, M., Czajkowski, S., Denis-Petit, D., Ducasse, Q., Mathieu, L., Tsekhanovich, I., Henriques, A., Méot, V., Roig, O., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Solar cells, Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Si telescopes, FOS: Physical sciences, Fission probabilities, Instrumentation and Detectors (physics.ins-det), C6 D 6 scintillators, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], γ -emission probabilities, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), Nuclear Experiment, Germanium detectors
Abstract

Fission and gamma-emission probabilities induced by transfer or inelastic scattering reactions with light projectile nuclei are very valuable quantities for constraining the models that describe the de-excitation of heavy nuclei. We have developed an experimental set-up that allows us to simultaneously measure fission and gamma-emission probabilities. The measurement of the gamma-emission probability at excitation energies where the fission channel is open is challenging due to the intense background of gamma rays emitted by the fission fragments. We discuss the procedure to subtract such a background and the constraints that this subtraction and other experimental conditions put on the set up. We show that our set-up complies with these constraints., 18 pages, 10 figures

Published
2019
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4. Disappearance of shell effects and persistence of an even-odd staggering in the fragment production in nuclear reactions at relativistic energies

Author

Rejmund, F., Bethenod, A., Napolitani, P., Taieb, J., Villagrasa, C., Audouin, L., Armbruster, P., Bacri, C. O., Benlliure, J., Bernas, M., Berthier, B., Boudard, A., Casajeros, E., Czajkowski, S., Connell, J. J., Enqvist, T., Faesterman, T., George, J. S., Junghans, A., Jurado, B., Hammache, F., Leray, S., Legrain, R., Mewaldt, R. A., Pereira, J., Ricciardi, M. V., Schmidt, K. -H., Stéphan, C., Sümmerer, K., Tassan-Got, L., Volant, C., Wiedenbeck, M. E., Wlazlo, W., and Yanasak, N. E.

Published
2002
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5. Decay patterns of target-like and projectile-like nuclei produced in Kr-84+Au-197, U-nat reactions at E/A=150 MeV

Subjects
energy dissipation, HOT NUCLEI, fission probabilities, HEAVY-ION COLLISIONS, INTRANUCLEAR CASCADE CALCULATION, STATISTICAL MULTIFRAGMENTATION, MODEL, SIMULATION, KR-INDUCED REACTIONS, neutron multiplicities, Kr + Au, E/A=150MeV, relativistic heavy-ion collisions
Abstract

The reactions Kr-84+Au-197 and Kr-84+U-nat were studied at an incident energy of E/A = 150 MeV employing the large-volume neutron multiplicity meter ORION, The observed correlations between the atomic number of projectile-like nuclei (PLN) and neutron multiplicity indicate large deposits of excitation energies in the primary fragments, Angular correlations between fragments from the fission of target-like nuclei (TLN) and secondary PLN show a memory of the reaction plane. No indications for spin effects were found in the TLN-fission fragment distribution.

Published
1996

6. Decay patterns of target-like and projectile-like nuclei produced in Kr-84+Au-197, U-nat reactions at E/A=150 MeV

Author

Quednau, BM, Crema, E, Galin, J, Gebauer, B, Hilscher, D, Jacquet, D, Jahnke, U, Ledoux, [No Value], LepineSzily, A, Leray, S, Lott, B, Morjean, M, Peghaire, A, Pienkowski, L, Proschitzki, S, Roschert, G, Rossner, H, Siemssen, RH, Stephan, C, and KVI - Center for Advanced Radiation Technology

Subjects
energy dissipation, HOT NUCLEI, Nuclear Theory, Kr + Au, U, fission probabilities, HEAVY-ION COLLISIONS, INTRANUCLEAR CASCADE CALCULATION, STATISTICAL MULTIFRAGMENTATION, MODEL, SIMULATION, KR-INDUCED REACTIONS, Nuclear Experiment, neutron multiplicities, E/A=150MeV, relativistic heavy-ion collisions
Abstract

The reactions Kr-84+Au-197 and Kr-84+U-nat were studied at an incident energy of E/A = 150 MeV employing the large-volume neutron multiplicity meter ORION, The observed correlations between the atomic number of projectile-like nuclei (PLN) and neutron multiplicity indicate large deposits of excitation energies in the primary fragments, Angular correlations between fragments from the fission of target-like nuclei (TLN) and secondary PLN show a memory of the reaction plane. No indications for spin effects were found in the TLN-fission fragment distribution.

Published
1996

7. Axial symmetry around the recoil axis for the 238U(α, α'f) reaction and the fission probability in the giant resonance region

Author

H. Janszen, Adriaan van der Woude, R. De Leo, Peter David, van der Johannes Plicht, Mohsen Harakeh, S. Micheletti, and Isotope Research

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Cluster decay, α'f), Fission, Isoscalar, Nuclear Theory, Photofission, measured σ(fragment, φ, θ), fission probabilities, measured σ(fragment, fission probabilities, Discussed fission decay mode in giant resonance region, fission 238U(α, Nuclear physics, Recoil, E = 120 MeV, φ, Giant resonance, fission 238U(α, α'f), E = 120 MeV, Atomic physics, Axial symmetry, Nuclear Experiment, θ)
Abstract

A measurement of the α-spectrum in the region of the isoscalar giant resonances from 238 U at E α = 120 MeV in coincidence with out-of-plane fission fragments shows the validity of the hypothesis of axial symmetry with respect to the recoil axis. Similar to what was observed in previous in-plane measurements the fission probability in the giant resonance region is lower than that measured in photofission indicating a decreased fission probability for the isoscalar giant resonances.

Published
1982

8. The study of the (α, α'f) reaction at 120MeV on 232Th (III)

Subjects
excitation functions, angular distributions, α'f) E = 120 MeV, fission probabilities, mass distributions, measured fission fragment energies, fission 232Th(α, Physics::Atmospheric and Oceanic Physics
Abstract

The total kinetic energy release (TKE) of the fissioning nucleus 232Th is measured as a function of excitation energy and for various mass separations. A direct correlation of the TKE and of the prompt neutron yield excitation functions is observed. The mass yield is presented as function of the total kinetic energy of the fragments. Fine structure in the TKE and in the mass yield distributions is observed in the barrier region. An excitation function for the symmetric mass component of 232Th is presented.

Published
1982

9. The study of the (α, α'f) reaction at 120MeV on 232Th (III): Total kinetic energies and mass distributions for excitation energies below 12 MeV

Author

David, P., Debrus, J., Janszen, H., Schulze, J., Harakeh, M.N., Plicht, J. van der, van der Woude, Adriaan, and Isotope Research

Subjects
excitation functions, angular distributions, fission 232Th(α, α'f) E = 120 MeV, fission probabilities, mass distributions, measured fission fragment energies, Physics::Atmospheric and Oceanic Physics
Abstract

The total kinetic energy release (TKE) of the fissioning nucleus 232Th is measured as a function of excitation energy and for various mass separations. A direct correlation of the TKE and of the prompt neutron yield excitation functions is observed. The mass yield is presented as function of the total kinetic energy of the fragments. Fine structure in the TKE and in the mass yield distributions is observed in the barrier region. An excitation function for the symmetric mass component of 232Th is presented.

Published
1982

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