Cargando…
Importance of nuclear triaxiality for electromagnetic strength, level density and neutron capture cross sections in heavy nuclei
Cross sections for neutron capture in the range of unresolved resonances are predicted simultaneously to level distances at the neutron threshold for more than 100 spin-0 target nuclei with A >70. Assuming triaxiality in nearly all these nuclei a combined parameterization for both, level density...
Autores principales: | , , |
---|---|
Lenguaje: | eng |
Publicado: |
2014
|
Materias: | |
Acceso en línea: | http://cds.cern.ch/record/1641020 |
_version_ | 1780934856435302400 |
---|---|
author | Grosse, Eckart Junghans, Arnd R Massarczyk, Ralph |
author_facet | Grosse, Eckart Junghans, Arnd R Massarczyk, Ralph |
author_sort | Grosse, Eckart |
collection | CERN |
description | Cross sections for neutron capture in the range of unresolved resonances are predicted simultaneously to level distances at the neutron threshold for more than 100 spin-0 target nuclei with A >70. Assuming triaxiality in nearly all these nuclei a combined parameterization for both, level density and photon strength is presented. The strength functions used are based on a global fit to IVGDR shapes by the sum of three Lorentzians adding up to the TRK sum rule and theory-based predictions for the A-dependence of pole energies and spreading widths. For the small spins reached by capture level densities are well described by only one free global parameter; a significant collective enhancement due to the deviation from axial symmetry is observed. Reliable predictions for compound nuclear reactions also outside the valley of stability as expected from the derived global parameterization are important for nuclear astrophysics and for the transmutation of nuclear waste. |
id | cern-1641020 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2014 |
record_format | invenio |
spelling | cern-16410202019-09-30T06:29:59Zhttp://cds.cern.ch/record/1641020engGrosse, EckartJunghans, Arnd RMassarczyk, RalphImportance of nuclear triaxiality for electromagnetic strength, level density and neutron capture cross sections in heavy nucleiNuclear Physics - ExperimentCross sections for neutron capture in the range of unresolved resonances are predicted simultaneously to level distances at the neutron threshold for more than 100 spin-0 target nuclei with A >70. Assuming triaxiality in nearly all these nuclei a combined parameterization for both, level density and photon strength is presented. The strength functions used are based on a global fit to IVGDR shapes by the sum of three Lorentzians adding up to the TRK sum rule and theory-based predictions for the A-dependence of pole energies and spreading widths. For the small spins reached by capture level densities are well described by only one free global parameter; a significant collective enhancement due to the deviation from axial symmetry is observed. Reliable predictions for compound nuclear reactions also outside the valley of stability as expected from the derived global parameterization are important for nuclear astrophysics and for the transmutation of nuclear waste.arXiv:1401.0925oai:cds.cern.ch:16410202014-01-05 |
spellingShingle | Nuclear Physics - Experiment Grosse, Eckart Junghans, Arnd R Massarczyk, Ralph Importance of nuclear triaxiality for electromagnetic strength, level density and neutron capture cross sections in heavy nuclei |
title | Importance of nuclear triaxiality for electromagnetic strength, level density and neutron capture cross sections in heavy nuclei |
title_full | Importance of nuclear triaxiality for electromagnetic strength, level density and neutron capture cross sections in heavy nuclei |
title_fullStr | Importance of nuclear triaxiality for electromagnetic strength, level density and neutron capture cross sections in heavy nuclei |
title_full_unstemmed | Importance of nuclear triaxiality for electromagnetic strength, level density and neutron capture cross sections in heavy nuclei |
title_short | Importance of nuclear triaxiality for electromagnetic strength, level density and neutron capture cross sections in heavy nuclei |
title_sort | importance of nuclear triaxiality for electromagnetic strength, level density and neutron capture cross sections in heavy nuclei |
topic | Nuclear Physics - Experiment |
url | http://cds.cern.ch/record/1641020 |
work_keys_str_mv | AT grosseeckart importanceofnucleartriaxialityforelectromagneticstrengthleveldensityandneutroncapturecrosssectionsinheavynuclei AT junghansarndr importanceofnucleartriaxialityforelectromagneticstrengthleveldensityandneutroncapturecrosssectionsinheavynuclei AT massarczykralph importanceofnucleartriaxialityforelectromagneticstrengthleveldensityandneutroncapturecrosssectionsinheavynuclei |