Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Radiative neutron capture: Hauser Feshbach vs. statistical resonances
Paul Scherrer Inst, Reactor Phys & Syst Behav Lab, Villigen, Switzerland..
Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226, B-1050 Brussels, Belgium..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. IAEA, Nucl Data Sect, Vienna, Austria..
Paul Scherrer Inst, Reactor Phys & Syst Behav Lab, Villigen, Switzerland..
2017 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 764, 109-113 p.Article in journal (Refereed) Published
Abstract [en]

The radiative neutron capture rates for isotopes of astrophysical interest are commonly calculated on the basis of the statistical Hauser Feshbach (HF) reaction model, leading to smooth and monotonically varying temperature-dependent Maxwellian-averaged cross sections (MACS). The HF approximation is known to be valid if the number of resonances in the compound system is relatively high. However, such a condition is hardly fulfilled for keV neutrons captured on light or exotic neutron-rich nuclei. For this reason, a different procedure is proposed here, based on the generation of statistical resonances. This novel technique, called the "High Fidelity Resonance" (HFR) method is shown to provide similar results as the HF approach for nuclei with a high level density but to deviate and be more realistic than HF predictions for light and neutron-rich nuclei or at relatively low sub-keV energies. The MACS derived with the HFR method are systematically compared with the traditional HF calculations for some 3300 neutron-rich nuclei and shown to give rise to significantly larger predictions with respect to the HF approach at energies of astrophysical relevance. For this reason, the HF approach should not be applied to light or neutron-rich nuclei. The Doppler broadening of the generated resonances is also studied and found to have a negligible impact on the calculated MACS.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 764, 109-113 p.
Keyword [en]
Statistical Hauser-Feshbach model, Radiative neutron captures, Nuclear astrophysics
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-319671DOI: 10.1016/j.physletb.2016.11.018ISI: 000390127100013OAI: oai:DiVA.org:uu-319671DiVA: diva2:1087469
Available from: 2017-04-07 Created: 2017-04-07 Last updated: 2017-04-07Bibliographically approved

Open Access in DiVA

fulltext(548 kB)25 downloads
File information
File name FULLTEXT01.pdfFile size 548 kBChecksum SHA-512
a23d4afd1e439c01191ac5e64c7452715ec43da8e4043a2cb1b2a3a5f054a0dcf8c554a5ce329807eeaeb9e7d9ad780645f4a4b63521b9c8810065a9c603a005
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Koning, Arjan J.
By organisation
Applied Nuclear Physics
In the same journal
Physics Letters B
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
Total: 25 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 184 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf