Bulk properties of iron isotopes


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Algin E., Schiller A., Voinov A., Agvaanluvsan U., Belgya T., Bernstein L. A., ...More

PHYSICS OF ATOMIC NUCLEI, vol.70, no.9, pp.1634-1639, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 70 Issue: 9
  • Publication Date: 2007
  • Doi Number: 10.1134/s1063778807090232
  • Journal Name: PHYSICS OF ATOMIC NUCLEI
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1634-1639
  • Eskisehir Osmangazi University Affiliated: No

Abstract

Nuclear level densities and radiative strength functions (RSFs) in Fe-56 and Fe-57 were measured using the Fe-57(He-3, alpha gamma) and Fe-57(He-3, He-3'gamma) reactions, respectively, at the Oslo Cyclotron Laboratory. A low-energy enhancement in the RSF below 4-MeV energy was observed. This finding cannot be explained by common theoretical models. In a second experiment, two-step cascade intensities with soft primary transitions from the Fe-56(n, 2 gamma) reaction were measured. The agreement between the two experiments confirms the low-energy enhancement in the RSFs. In a third experiment, the neutron evaporation spectrum from the Mn-55(d, n)Fe-56 reaction was measured at 7-MeV deuteron energy at the John Edwards Accelerator Laboratory at Ohio University. Comparison of the level density of Fe-56 obtained from the first and third experiments gives an overall good agreement. Furthermore, observed enhancement for soft gamma rays is strengthened by the last experiment.