Do light nuclei display a universal γ -ray strength function?

M. Guttormsen, A. C. Larsen, A. Bürger, A. Görgen, H. T. Nyhus, S. Siem, N. U.H. Syed, H. K. Toft, G. M. Tveten, S. Harissopulos, T. Konstantinopoulos, A. Lagoyannis, G. Perdikakis, A. Spyrou, M. Kmiecik, K. Mazurek, T. Krtička, T. Lönnroth, M. Norrby, A. SchillerA. Voinov

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Abstract

In this work we focus on properties in the quasi-continuum of light nuclei. Generally, both level density and γ-ray strength function (γ-SF) differ from nucleus to nucleus. In order to investigate this closer, we have performed particle-γ coincidences using the reactions (p, p'), (p, d) and (p, t) on a 46Ti target. In particular, the very rich data set of the 46Ti(p, p')46Ti inelastic scattering reaction allows analysis of the coincidence data for many independent data sets. Using the Oslo method, we find one common level density for all data sets. If transitions to well-separated low-energy levels are included, the deduced γ-SF may change by a factor of 2 - 3, due strong to Porter-Thomas fluctuations. However, a universal γ-SF with small fluctuations is found provided that only excitation energies above 3 MeV are taken into account. The nuclear structure of the titaniums is discussed within a combinatorial quasi-particle model, showing that only few Nilsson orbitals participate in building up the level density for these light nuclei.

Original languageEnglish
Article number04004
JournalEPJ Web of Conferences
Volume21
DOIs
StatePublished - 2012
Event3rd International Workshop on Compound Nuclear Reactions and Related Topics, CNR 2011 - Prague, Czech Republic
Duration: Sep 19 2011Sep 23 2011

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