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Title: 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

Abstract

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.

Authors:
; ;  [1];  [2]; ; ; ; ; ; ;  [1];  [3];  [4]; ;  [5];  [6]; ;  [5];  [7]
  1. Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna (Russian Federation)
  2. (Slovakia)
  3. Institut de Recherches Subatomiques, CNRS-IN2P3, Strasbourg (France)
  4. Institute of Physics SASc, Dubravska cesta 9, 84228 Bratislava (Slovakia)
  5. Deparment of Physics, University of Jyvaeskylae, FIN-40351, Jyvaeskylae (Finland)
  6. (Russian Federation)
  7. V.G. Khlopin Radium Institute, St. Petersburg 194021 (Russian Federation)
Publication Date:
OSTI Identifier:
21061820
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 912; Journal 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)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Beresova, M., Kliman, J., Krupa, L., Institute of Physics SASc, Dubravska cesta 9, 84228 Bratislava, Bogatchev, A. A., Itkis, I. M., Itkis, M. G., Kniajeva, G. N., Kondratiev, N. A., Kozulin, E. M., Pokrovsky, I. V., Dorvaux, O., Khlebnikov, S., Lyapin, V., Rubchenia, W., V.G. Khlopin Radium Institute, St.-Petersburg 194021, Stuttge, L., Trzaska, W., and Vakhtin, D. 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. United States: N. p., 2007. Web. doi:10.1063/1.2746613.
Beresova, M., Kliman, J., Krupa, L., Institute of Physics SASc, Dubravska cesta 9, 84228 Bratislava, Bogatchev, A. A., Itkis, I. M., Itkis, M. G., Kniajeva, G. N., Kondratiev, N. A., Kozulin, E. M., Pokrovsky, I. V., Dorvaux, O., Khlebnikov, S., Lyapin, V., Rubchenia, W., V.G. Khlopin Radium Institute, St.-Petersburg 194021, Stuttge, L., Trzaska, W., & Vakhtin, D. 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. United States. doi:10.1063/1.2746613.
Beresova, M., Kliman, J., Krupa, L., Institute of Physics SASc, Dubravska cesta 9, 84228 Bratislava, Bogatchev, A. A., Itkis, I. M., Itkis, M. G., Kniajeva, G. N., Kondratiev, N. A., Kozulin, E. M., Pokrovsky, I. V., Dorvaux, O., Khlebnikov, S., Lyapin, V., Rubchenia, W., V.G. Khlopin Radium Institute, St.-Petersburg 194021, Stuttge, L., Trzaska, W., and Vakhtin, D. Tue . "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". United States. doi:10.1063/1.2746613.
@article{osti_21061820,
title = {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},
author = {Beresova, M. and Kliman, J. and Krupa, L. and Institute of Physics SASc, Dubravska cesta 9, 84228 Bratislava and Bogatchev, A. A. and Itkis, I. M. and Itkis, M. G. and Kniajeva, G. N. and Kondratiev, N. A. and Kozulin, E. M. and Pokrovsky, I. V. and Dorvaux, O. and Khlebnikov, S. and Lyapin, V. and Rubchenia, W. and V.G. Khlopin Radium Institute, St.-Petersburg 194021 and Stuttge, L. and Trzaska, W. and Vakhtin, D.},
abstractNote = {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.},
doi = {10.1063/1.2746613},
journal = {AIP Conference Proceedings},
number = 1,
volume = 912,
place = {United States},
year = {Tue May 22 00:00:00 EDT 2007},
month = {Tue May 22 00:00:00 EDT 2007}
}