Broken axial symmetry as essential feature to predict radiative capture in heavy nuclei
Broken axial symmetry as essential feature to predict radiative capture in heavy nuclei
Grosse, E.; Junghans, A. R.; Massarczyk, R.
Abstract
Cross sections for neutron capture in the range of unresolved resonances are predicted for more than 140 spin-0 target nuclei with A >50. Allowing the breaking of spherical and axial symmetry in nearly all these nuclei a combined parameterization for bothlevel density and photon strength is obtained which employs with surprisingly few fit parameters only. The strength functions used are based on a global fit to IVGDR shapes by the sum of three Lorentzians. They are based on theoretical predictions for the A-dependence of pole energies and spreading widths and add up to the TRK sum rule. For the small spins reached by capture resonance spacings are well described by a level density parameter close to the nuclear matter value; a significant collective enhancement is apparent due to the deviation from axial symmetry. Reliable predictions for compound nuclear reactions also outside the valley of stability – important for nuclear astrophysics and for the transmutation of nuclear waste – are expected to result from the global parameterization presented.
Keywords: Radiative neutron capture; Level density; Isovector giant dipole resonance; Lorentzian; Photon strength function; Triaxiality
Involved research facilities
- Radiation Source ELBE DOI: 10.17815/jlsrf-2-58
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- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 21115) publication
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Physics Letters B 739(2014), 425-432
DOI: 10.1016/j.physletb.2014.10.051
Cited 4 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-21115