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Phys. Rev. C 71, 044307 (2005) [7 pages]

Radiative strength functions in 93-98Mo

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M. Guttormsen1,*, R. Chankova1, U. Agvaanluvsan2, E. Algin2,3,4,5, L. A. Bernstein2, F. Ingebretsen1, T. Lönnroth6, S. Messelt1, G. E. Mitchell3,4, J. Rekstad1, A. Schiller2, S. Siem1, A. C. Sunde1, 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
3North Carolina State University, Raleigh, North Carolina 27695
4Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708
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
8Frank Laboratory of Neutron Physics, Joint Institute of Nuclear Research, 141980 Dubna, Moscow Region, Russia

Received 26 November 2004; published 20 April 2005

Radiative strength functions (RSFs) in 93-98Mo have been extracted using the (3He,αγ) and (3He,3He'γ) reactions. The RSFs are U shaped as function of γ energy with a minimum at around Eγ=3 MeV. The minimum values increase with neutron number because of the increase in the low-energy tail of the giant electric dipole resonance with nuclear deformation. The unexpected strong increase in strength below Eγ=3 MeV, here called soft pole, is established for all 93-98Mo isotopes. The soft pole is present at all initial excitation energies in the 5-8-MeV region.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.71.044307
DOI:
10.1103/PhysRevC.71.044307
PACS:
24.30.Gd, 24.10.Pa, 25.55.Hp, 27.60.+j

*Electronic address: magne.guttormsen@fys.uio.no

 
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