Level densities and thermodynamical properties of Pt and Au isotopes

F. Giacoppo, F. L. Bello Garrote, L. A. Bernstein, D. L. Bleuel, T. K. Eriksen, R. B. Firestone, A. Görgen, M. Guttormsen, T. W. Hagen, B. V. Kheswa, M. Klintefjord, P. E. Koehler, A. C. Larsen, H. T. Nyhus, T. Renstrøm, E. Sahin, S. Siem, and T. Tornyi
Phys. Rev. C 90, 054330 – Published 20 November 2014

Abstract

The nuclear level densities of Pt194196 and Au197,198 below the neutron separation energy have been measured using transfer and scattering reactions. All the level density distributions follow the constant-temperature description. Each group of isotopes is characterized by the same temperature above the energy threshold corresponding to the breaking of the first Cooper pair. A constant entropy excess ΔS=1.9kB and 1.1kB is observed in Pt195 and Au198 with respect to Pt196 and Au197, respectively, giving information on the available single-particle level space for the last unpaired valence neutron. The breaking of nucleon Cooper pairs is revealed by sequential peaks in the microcanonical caloric curve.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
1 More
  • Received 25 August 2014
  • Revised 21 October 2014

DOI:https://doi.org/10.1103/PhysRevC.90.054330

©2014 American Physical Society

Authors & Affiliations

F. Giacoppo1,*, F. L. Bello Garrote1, L. A. Bernstein2, D. L. Bleuel2, T. K. Eriksen1, R. B. Firestone3, A. Görgen1, M. Guttormsen1, T. W. Hagen1, B. V. Kheswa1,4, M. Klintefjord1, P. E. Koehler1,5, A. C. Larsen1, H. T. Nyhus1, T. Renstrøm1, E. Sahin1, S. Siem1, and T. Tornyi1,6

  • 1Department of Physics, University of Oslo, N-0316 Oslo, Norway
  • 2Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550-9234, USA
  • 3Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720-88R0192, USA
  • 4iThemba LABS, P.O. Box 722, 7129 Somerset West, South Africa
  • 5Air Force Technical Applications Center, Patrick Air Force Base, Florida 32925, USA
  • 6Institute of Nuclear Research of the Hungarian Academy of Sciences (MTA Atomki), H-4001 Debrecen, Hungary

  • *francesca.giacoppo@fys.uio.no

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 90, Iss. 5 — November 2014

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×