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Phys. Rev. C 73, 034311 (2006) [12 pages]

Level densities and thermodynamical quantities of heated 93-98Mo isotopes

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R. Chankova1,*, A. Schiller2, U. Agvaanluvsan2,3, E. Algin2,3,4,5, L. A. Bernstein2, M. Guttormsen1, F. Ingebretsen1, T. Lönnroth6, S. Messelt1, G. E. Mitchell3,4, J. Rekstad1, S. Siem1, A. C. Larsen1, A. Voinov7,8, and S. Ødegård1
1Department of Physics, University of Oslo, N-0316 Oslo, Norway
2Lawrence Livermore National Laboratory, L-414, 7000 East Avenue, Livermore, California 94551, USA
3North Carolina State University, Raleigh, North Carolina 27695, USA
4Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
5Department of Physics, Osmangazi University, Meselik, Eskisehir, 26480 Turkey
6Department of Physics, Åbo Akademi, FIN-20500 Turku, Finland
7Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
8Frank Laboratory of Neutron Physics, Joint Institute of Nuclear Research, RU-141980 Dubna, Moscow, Russia

Received 30 June 2005; published 16 March 2006

Level densities for 93-98Mo have been extracted using the (3He,αγ) and (3He,3He'γ) reactions. From the level densities thermodynamical quantities such as temperature and heat capacity can be deduced. Data have been analyzed by utilizing both the microcanonical and the canonical ensemble. Structures in the microcanonical temperature are consistent with the breaking of nucleon Cooper pairs. The S shape of the heat capacity curves found within the canonical ensemble is interpreted as consistent with a pairing phase transition with a critical temperature for the quenching of pairing correlations at Tc~0.7-1.0MeV.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.034311
DOI:
10.1103/PhysRevC.73.034311
PACS:
21.10.Ma, 24.10.Pa, 25.55.-e, 27.60.+j

*Electronic address: rositsa.chankova@fys.uio.no

 
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