Properties of warm nuclei in the quasi-continuum

M. Guttormsen^1a, U. Agvaanluvsan^2,3, E. Algin⁴, A. Bürger¹, A.C. Larsen¹, G.E. Mitchell^5,6, H.T. Nyhus¹, S. Siem¹, H.K. Toft¹ and A. Voinov⁷

¹ Department of Physics, University of Oslo, N-0316 Oslo, Norway
² Stanford University, Palo Alto, California 94305 USA
³ MonAme Scientific Research Center, Ulaanbaatar, Mongolia
⁴ Department of Physics, Eskisehir Osmangazi University, Meselik, 26480 Turkey
⁵ Department of Physics, North Carolina State University, Raleigh, NC 27695, USA
⁶ Triangle Universities Nuclear Laboratory, Durham, NC 27708, USA
⁷ Department of Physics, Ohio University, Athens, OH 45701, USA

^a e-mail: magne.guttormsen@fys.uio.no

Abstract

Nuclear thermodynamic quantities are extracted from nuclear level densities measured with the CACTUS detector array at the Oslo Cyclotron Laboratory. The experiments are performed with light-particle inelastic or transfer reactions. A simple combinatorial model is used to describe the underlying mechanisms responsible for the exponential increasing level density as function of excitation energy. The calculated number of broken Cooper pairs and the parity distribution in continuum are discussed.