Details

Autor(en) / Beteiligte

• Guttormsen, M.
• Jurado, B.
• Wilson, J. N.
• Aiche, M.
• Bernstein, L. A.
• Ducasse, Q.
• Giacoppo, F.
• Görgen, A.
• Gunsing, F.
• Hagen, T. W.
• Larsen, A. C.
• Lebois, M.
• Leniau, B.
• Renstrøm, T.
• Rose, S. J.
• Siem, S.
• Tornyi, T.
• Tveten, G. M.
• Wiedeking, M.

Titel

Constant-temperature level densities in the quasicontinuum of Th and U isotopes

Ist Teil von

• Physical review. C, Nuclear physics, 2013-08, Vol.88 (2), Article 024307

Ort / Verlag

American Physical Society

Erscheinungsjahr

2013

Link zum Volltext

Quelle

PROLA - Physical Review Online Archive

Beschreibungen/Notizen

• Particle-γ coincidences have been measured to obtain γ-ray spectra as a function of excitation energy for 231–233Th and 237–239U. The level densities, which were extracted using the Oslo method, show a constant temperature behavior. The isotopes display very similar temperatures in the quasicontinuum, however, the even-odd isotopes reveal a constant entropy increase ΔS compared to their even-even neighbors. The entropy excess depends on available orbitals for the last unpaired valence neutron of the heated nuclear system. Also, experimental microcanonical temperature and heat capacity have been extracted. Several poles in the heat capacity curve support the idea that an almost continuous melting of Cooper pairs is responsible for the constant-temperature behavior. © 2013 American Physical Society