Fission barriers at the end of the chart of the nuclides
Abstract
We present calculated fission-barrier heights for 5239 nuclides for all nuclei between the proton and neutron drip lines with 171 ≤ A ≤ 330. The barriers are calculated in the macroscopic-microscopic finite-range liquid-drop (FRLDM) with a 2002 set of macroscopic-model parameters. The saddle-point energies are determined from potential-energy surfaces based on more than five million different shapes, defined by five deformation parameters in the three-quadratic-surface shape parametrization: elongation, neck diameter, left-fragment spheroidal deformation, right-fragment spheroidal deformation, and nascent-fragment mass asymmetry. The energy of the ground state is determined by calculating the lowest-energy configuration in both the Nilsson perturbed-spheroid (ϵ) and the spherical-harmonic (β) parametrizations, including axially asymmetric deformations. The lower of the two results (correcting for zero-point motion) is defined as the ground-state energy. The effect of axial asymmetry on the inner barrier peak is calculated in the (ϵ,γ) parametrization. We have earlier benchmarked our calculated barrier heights to experimentally extracted barrier parameters and found average agreement to about one MeV for known data across the nuclear chart. Here we do additional benchmarks and investigate the qualitative and, when possible, quantitative agreement and/or consistency with data on β-delayed fission, isotope generation along prompt-neutron-capture chains in nuclear-weapons tests, and superheavy-element stability.more »
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Kyoto Univ., Kyoto (Japan)
- Japan Atomic Energy Agency (JAEA), Ibaraki (Japan)
- Univ. of Notre Dame, Notre Dame, IN (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1193680
- Alternate Identifier(s):
- OSTI ID: 1180139
- Report Number(s):
- LA-UR-14-24999
Journal ID: ISSN 0556-2813; PRVCAN
- Grant/Contract Number:
- FG02-06ER41407; AC52-06NA25396; 25287065; PHY0822648
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C, Nuclear Physics
- Additional Journal Information:
- Journal Volume: 91; 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
Möller, Peter, Sierk, Arnold J., Ichikawa, Takatoshi, Iwamoto, Akira, and Mumpower, Matthew. Fission barriers at the end of the chart of the nuclides. United States: N. p., 2015.
Web. doi:10.1103/PhysRevC.91.024310.
Möller, Peter, Sierk, Arnold J., Ichikawa, Takatoshi, Iwamoto, Akira, & Mumpower, Matthew. Fission barriers at the end of the chart of the nuclides. United States. https://doi.org/10.1103/PhysRevC.91.024310
Möller, Peter, Sierk, Arnold J., Ichikawa, Takatoshi, Iwamoto, Akira, and Mumpower, Matthew. Thu .
"Fission barriers at the end of the chart of the nuclides". United States. https://doi.org/10.1103/PhysRevC.91.024310. https://www.osti.gov/servlets/purl/1193680.
@article{osti_1193680,
title = {Fission barriers at the end of the chart of the nuclides},
author = {Möller, Peter and Sierk, Arnold J. and Ichikawa, Takatoshi and Iwamoto, Akira and Mumpower, Matthew},
abstractNote = {We present calculated fission-barrier heights for 5239 nuclides for all nuclei between the proton and neutron drip lines with 171 ≤ A ≤ 330. The barriers are calculated in the macroscopic-microscopic finite-range liquid-drop (FRLDM) with a 2002 set of macroscopic-model parameters. The saddle-point energies are determined from potential-energy surfaces based on more than five million different shapes, defined by five deformation parameters in the three-quadratic-surface shape parametrization: elongation, neck diameter, left-fragment spheroidal deformation, right-fragment spheroidal deformation, and nascent-fragment mass asymmetry. The energy of the ground state is determined by calculating the lowest-energy configuration in both the Nilsson perturbed-spheroid (ϵ) and the spherical-harmonic (β) parametrizations, including axially asymmetric deformations. The lower of the two results (correcting for zero-point motion) is defined as the ground-state energy. The effect of axial asymmetry on the inner barrier peak is calculated in the (ϵ,γ) parametrization. We have earlier benchmarked our calculated barrier heights to experimentally extracted barrier parameters and found average agreement to about one MeV for known data across the nuclear chart. Here we do additional benchmarks and investigate the qualitative and, when possible, quantitative agreement and/or consistency with data on β-delayed fission, isotope generation along prompt-neutron-capture chains in nuclear-weapons tests, and superheavy-element stability. In addition these studies all indicate that the model is realistic at considerable distances in Z and N from the region of nuclei where its parameters were determined.},
doi = {10.1103/PhysRevC.91.024310},
journal = {Physical Review C, Nuclear Physics},
number = 2,
volume = 91,
place = {United States},
year = {Thu Feb 12 00:00:00 EST 2015},
month = {Thu Feb 12 00:00:00 EST 2015}
}
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