Excitation-energy dependence of fission in the mercury region
Abstract
Recent experiments on β-delayed fission reported an asymmetric mass yield in the neutron-deficient nucleus 180Hg. Earlier experiments in the mass region A = 190–200 close to the β-stability line, using the (p,f) and (α,f) reactions, observed a more symmetric distribution of fission fragments. While the β-delayed fission of 180Hg can be associated with relatively low excitation energy, this is not the case for light-ion reactions, which result in warm compound nuclei. Here, the low-energy fission of 180,198Hg has been successfully described by theory in terms of strong shell effects in pre-scission configurations associated with dinuclear structures.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw, Warsaw (Poland)
- Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Kashmir, Srinagar (India)
- Univ. of Tennessee, Knoxville, TN (United States); Maria Curie-Sklodowska Univ., Lublin (Poland)
- Maria Curie-Sklodowska Univ., Lublin (Poland)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1454619
- Alternate Identifier(s):
- OSTI ID: 1180093
- Report Number(s):
- LLNL-JRNL-656299
Journal ID: ISSN 0556-2813; PRVCAN; 777127; TRN: US1901095
- Grant/Contract Number:
- AC52-07NA27344; FG02-96ER40963; NA0001820; SC0008499; FC52-08NA28752
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C, Nuclear Physics
- Additional Journal Information:
- Journal Volume: 90; Journal Issue: 2; Journal ID: ISSN 0556-2813
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
McDonnell, J. D., Nazarewicz, W., Sheikh, J. A., Staszczak, A., and Warda, M. Excitation-energy dependence of fission in the mercury region. United States: N. p., 2014.
Web. doi:10.1103/PhysRevC.90.021302.
McDonnell, J. D., Nazarewicz, W., Sheikh, J. A., Staszczak, A., & Warda, M. Excitation-energy dependence of fission in the mercury region. United States. https://doi.org/10.1103/PhysRevC.90.021302
McDonnell, J. D., Nazarewicz, W., Sheikh, J. A., Staszczak, A., and Warda, M. Fri .
"Excitation-energy dependence of fission in the mercury region". United States. https://doi.org/10.1103/PhysRevC.90.021302. https://www.osti.gov/servlets/purl/1454619.
@article{osti_1454619,
title = {Excitation-energy dependence of fission in the mercury region},
author = {McDonnell, J. D. and Nazarewicz, W. and Sheikh, J. A. and Staszczak, A. and Warda, M.},
abstractNote = {Recent experiments on β-delayed fission reported an asymmetric mass yield in the neutron-deficient nucleus 180Hg. Earlier experiments in the mass region A = 190–200 close to the β-stability line, using the (p,f) and (α,f) reactions, observed a more symmetric distribution of fission fragments. While the β-delayed fission of 180Hg can be associated with relatively low excitation energy, this is not the case for light-ion reactions, which result in warm compound nuclei. Here, the low-energy fission of 180,198Hg has been successfully described by theory in terms of strong shell effects in pre-scission configurations associated with dinuclear structures.},
doi = {10.1103/PhysRevC.90.021302},
journal = {Physical Review C, Nuclear Physics},
number = 2,
volume = 90,
place = {United States},
year = {Fri Aug 29 00:00:00 EDT 2014},
month = {Fri Aug 29 00:00:00 EDT 2014}
}
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Figures / Tables:
FIG. 1: (Color online) Ground-state potential-energy surfaces for (a) 180Hg and (b) 198Hg in the ($Q_{20}$, $Q_{30}$) plane calculated in HFB-SkM*. The static fission pathway aEF corresponding to asymmetric elongated fragments is marked.
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