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Level density and gamma-decay properties of closed shell Pb nuclei

N. U. H. Syed, M. Guttormsen, F. Ingebretsen, A. C. Larsen, T. Lönnroth, J. Rekstad, A. Schiller, S. Siem, and A. Voinov

Phys. Rev. C: Nucl. Phys., vol: 79, num: 2, 14 pages, published: 23 February 2009, 024316

Abstract: The level densities and -ray strength functions of 205-208Pb have been measured with the Oslo method, using the (3He,3He') and (3He,) reactions on the target nuclei 206Pb and 208Pb. The extracted level densities are consistent with known discrete levels at low excitation energies. The entropies and temperatures in the microcanonical ensemble have been deduced from the experimental level density. An average entropy difference of S~0.9kB has been observed between 205Pb and 206Pb. The -ray strength functions in 205-208Pb have been extracted and compared with two models; however, none of them describe the data adequately. Intermediate structures have been observed in the -ray strength functions for -ray energies below neutron threshold in all the analyzed Pb nuclei. These structures become less pronounced while moving from the doubly magic nucleus 208Pb to 205Pb.


   Nuclear reactor physics.
      Neutron physics. Nuclear data.
         Other reactions: (γ, n), (n, 2n) etc.

   Nuclear reactor physics.
      Neutron physics. Nuclear data.
         Radioactive decay of nuclei.

   Atomic nucleus.
      Nuclear reactions.
         Nuclear reactions induced by 2H, 3H, 3He and α-particles (experiment).
            Interactions of 3H, 3He and α-particles with nuclei at E≤200 MeV.
               (t, α), (3He, α) reactions (A>40).

   Atomic nucleus.
      Nuclear reactions.
         Nuclear reactions induced by 2H, 3H, 3He and α-particles (experiment).
            Interactions of 3H, 3He and α-particles with nuclei at E≤200 MeV.
               Elastic and inelastic scattering of 3H and 3He and (t, 3He), (3He, t) reactions.

   Atomic nucleus.
      Radioactive decay.
         Electromagnetic transitions in nuclei (experiment).
            Electromagnetic transition rates in nuclei (A>150).

   Atomic nucleus.
      Basic nuclear properties. Properties of particular nuclei.
         Properties of particular nuclei (experiment).
            Z=79÷82.

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