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Phys. Rev. C 68, 054326 (2003) [6 pages]

Level densities in 56,57Fe and 96,97Mo

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A. Schiller1,*, E. Algin1,2,3,4, L. A. Bernstein1, P. E. Garrett1, M. Guttormsen5, M. Hjorth-Jensen5, C. W. Johnson6, G. E. Mitchell2,3, J. Rekstad5, S. Siem5, A. Voinov7, and W. Younes1
1Lawrence Livermore National Laboratory, L-414, 7000 East Avenue, Livermore, California 94551, USA
2North Carolina State University, Raleigh, North Carolina 27695, USA
3Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
4Department of Physics, Osmangazi University, Meselik, Eskisehir 26480, Turkey
5Department of Physics, University of Oslo, N-0316 Oslo, Norway
6San Diego State University, San Diego, California 92182, USA
7Frank Laboratory of Neutron Physics, Joint Institute of Nuclear Research, 141980 Dubna, Moscow region, Russia

Received 24 February 2003; revised 10 June 2003; published 26 November 2003

Level densities up close to the neutron binding energy have been extracted from primary γ spectra for 56,57Fe and 96,97Mo nuclei using (3He,αγ) and (3He,3He′γ) reactions on 57Fe and 97Mo targets. It is shown that statistical spectroscopy provides a useful tool in this mass region. Apparent step structures in the level-density curves are tentatively explained by a schematic microscopic model comprising single-particle level spacings and seniority-conserving and seniority-nonconserving interactions.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.68.054326
DOI:
10.1103/PhysRevC.68.054326
PACS:
21.10.Ma, 25.55.Hp, 27.40.+z, 27.60.+j

*Electronic address: schiller@nscl.msu.edu

 
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