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Title: Comparison of fission modes in {sup 252}Cf, {sup 257}Fm, and {sup 260}Md

Abstract

Although the spontaneous-fission properties of heavy actinides have been studied for well over 35 years, many interesting and informative details continue to come into light. During the last decade, the spontaneous fission of {sup 252}Cf, {sup 257}Fm and {sup 260}Md has been extensively investigated at the Philipps University of Marburg, by means of a gadolinium-doped liquid scintillation tank for neutron counting and surface barrier detectors for fission fragment detection. The three nuclides represent the transition from the well-known asymmetric fission yield distribution, as it is characteristic for {sup 252}Cf, to a much more symmetrical one, found in the fission of {sup 260}Md. Therefore, trends in the dynamical changes of fission properties have been derived from these studies. For the spontaneous fission of {sup 252}Cf and {sup 260}Md, it was already shown that different fission modes, as proposed by theoretical calculations of Brosa et al. (5), could be separated, using the correlation between the neutrons emitted in a fission event and both the observed fission-fragment mass and the total kinetic energy (1, 2). In the case of {sup 257}Fm, no theoretical calculations for fission modes exist. However, from the fission properties of the two surrounding actinides, one can expect at leastmore » three different fission modes, namely two 'standard' and the 'supershort' mode. In this paper, results from the recent {sup 257}Fm experiment will be presented and compared to systematics extracted from the fission properties of other heavy actinides.« less

Authors:
 [1]; ;  [2]; ;  [3];  [4]
  1. Laboratory for Materials Behaviour, Paul Scherrer Institute, CH-5232 Villigen-PSI (Switzerland)
  2. Philipps University, FB 15-Kernchemie, D-35032 Marburg an der Lahn (Germany)
  3. University of California, Lawrence Livermore National Lab., Livermore, California 94551 (United States)
  4. Dr. Westmeier GmbH, Moellnerweg 32, 35085 Ebsdorfergrund-Moelln (Germany)
Publication Date:
OSTI Identifier:
21202233
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 447; Journal Issue: 1; Conference: 2. international workshop on nuclear fission and fission-product spectroscopy, Seyssins (France), 22-25 Apr 1998; Other Information: DOI: 10.1063/1.56741; (c) 1998 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASYMMETRY; CALIFORNIUM 252; COMPARATIVE EVALUATIONS; CORRELATIONS; FERMIUM 257; FISSION FRAGMENT DETECTION; FISSION FRAGMENTS; FISSION YIELD; KINETIC ENERGY; LIQUID SCINTILLATION DETECTORS; MENDELEVIUM 260; NEUTRON SPECTRA; NEUTRONS; SPONTANEOUS FISSION; SURFACE BARRIER DETECTORS

Citation Formats

Aarle, J van, Siemon, K, Patzelt, P, Wild, J F, Lougheed, R W, and Westmeier, W. Comparison of fission modes in {sup 252}Cf, {sup 257}Fm, and {sup 260}Md. United States: N. p., 1998. Web. doi:10.1063/1.56741.
Aarle, J van, Siemon, K, Patzelt, P, Wild, J F, Lougheed, R W, & Westmeier, W. Comparison of fission modes in {sup 252}Cf, {sup 257}Fm, and {sup 260}Md. United States. https://doi.org/10.1063/1.56741
Aarle, J van, Siemon, K, Patzelt, P, Wild, J F, Lougheed, R W, and Westmeier, W. 1998. "Comparison of fission modes in {sup 252}Cf, {sup 257}Fm, and {sup 260}Md". United States. https://doi.org/10.1063/1.56741.
@article{osti_21202233,
title = {Comparison of fission modes in {sup 252}Cf, {sup 257}Fm, and {sup 260}Md},
author = {Aarle, J van and Siemon, K and Patzelt, P and Wild, J F and Lougheed, R W and Westmeier, W},
abstractNote = {Although the spontaneous-fission properties of heavy actinides have been studied for well over 35 years, many interesting and informative details continue to come into light. During the last decade, the spontaneous fission of {sup 252}Cf, {sup 257}Fm and {sup 260}Md has been extensively investigated at the Philipps University of Marburg, by means of a gadolinium-doped liquid scintillation tank for neutron counting and surface barrier detectors for fission fragment detection. The three nuclides represent the transition from the well-known asymmetric fission yield distribution, as it is characteristic for {sup 252}Cf, to a much more symmetrical one, found in the fission of {sup 260}Md. Therefore, trends in the dynamical changes of fission properties have been derived from these studies. For the spontaneous fission of {sup 252}Cf and {sup 260}Md, it was already shown that different fission modes, as proposed by theoretical calculations of Brosa et al. (5), could be separated, using the correlation between the neutrons emitted in a fission event and both the observed fission-fragment mass and the total kinetic energy (1, 2). In the case of {sup 257}Fm, no theoretical calculations for fission modes exist. However, from the fission properties of the two surrounding actinides, one can expect at least three different fission modes, namely two 'standard' and the 'supershort' mode. In this paper, results from the recent {sup 257}Fm experiment will be presented and compared to systematics extracted from the fission properties of other heavy actinides.},
doi = {10.1063/1.56741},
url = {https://www.osti.gov/biblio/21202233}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 447,
place = {United States},
year = {Mon Oct 26 00:00:00 EST 1998},
month = {Mon Oct 26 00:00:00 EST 1998}
}