Characteristics of Symmetric and Asymmetric Fission Modes as a Function of the Compound Nucleus Excitation in the Proton-Induced Fission of 233Pa, 239Np and 243Am

Journal Article · Tue May 22 00:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2746613· OSTI ID:21061820

Beresova, M; Kliman, J; Krupa, L ^[1]; Bogatchev, A A; Itkis, I M; Itkis, M G; Kniajeva, G N; Kondratiev, N A; Kozulin, E M; Pokrovsky, I V ^[1]; Dorvaux, O ^[2]; Khlebnikov, S ^[3]; Lyapin, V; Rubchenia, W ^[4]; Stuttge, L; Trzaska, W ^[4]; Vakhtin, D ^[5]

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1. Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna (Russian Federation)
2. Institut de Recherches Subatomiques, CNRS-IN2P3, Strasbourg (France)
3. Institute of Physics SASc, Dubravska cesta 9, 84228 Bratislava (Slovakia)
4. Deparment of Physics, University of Jyvaeskylae, FIN-40351, Jyvaeskylae (Finland)
5. V.G. Khlopin Radium Institute, St. Petersburg 194021 (Russian Federation)

Average preequilibrium <M{sub n}{sup preeq}> average statistical prescission <M{sub n}{sup stpre}> and postscission <M{sub n}{sup post}> neutron multiplicities as well as average {gamma}-ray multiplicity <M{gamma}>, average energy emitted by {gamma}-rays <E{gamma}> and average energy per one gamma quantum <{epsilon}{gamma}> as a function of mass and total kinetic energy (TKE) of fission fragments were measured in the proton-induced reactions p+232Th{yields}233Pa, p+238U{yields}239Np and p+242Pu{yields}243Am (at proton energy Ep=13, 20, 40 and 55 MeV). The fragment mass and energy distributions (MEDs) have been analyzed in terms of the multimodal fission. The decomposition of the experimental MEDs onto the MEDs of the distinct modes has been fulfilled in the framework of a method that is free from any parameterization of the distinct fission mode mass distribution shapes. The main characteristics for symmetric and asymmetric modes have been studied in their dependence on the compound nucleus composition and proton energy. The manifestation of multimodal fission in average {gamma}-ray multiplicities <M{gamma}> of fission fragments was also studied in this work.

• OSTI ID: 21061820
• Journal Information: AIP Conference Proceedings, Vol. 912, Issue 1; Conference: International symposium on exotic nuclei, Khanty-Mansiysk (Russian Federation), 17-22 Jul 2006; Other Information: DOI: 10.1063/1.2746613; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMERICIUM 243 TARGET
ASYMMETRY
COMPOUND NUCLEI
ENERGY SPECTRA
EXCITATION
FISSION
FISSION FRAGMENTS
GAMMA RADIATION
KINETIC ENERGY
MASS DISTRIBUTION
MEV RANGE
MULTIPLICITY
NEPTUNIUM 239 TARGET
NEUTRONS
PROTACTINIUM 233 TARGET
PROTON REACTIONS
PROTON-NUCLEON INTERACTIONS
SCISSION-POINT MODEL