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Phys. Rev. C 81, 024611 (2010) [7 pages]

Fusion hindrance for 27Al+45Sc and other systems with a positive Q value

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C. L. Jiang1, K. E. Rehm1, H. Esbensen1, B. B. Back1, R. V. F. Janssens1, P. Collon2, C. M. Deibel1,3, B. DiGiovine1, J. M. Figueira1,4, J. P. Greene1, D. J. Henderson1, H. Y. Lee1,*, M. Notani2, S. T. Marley1,5, R. C. Pardo1, N. Patel1,6, D. Seweryniak1, X. D. Tang2, C. Ugalde1, and S. Zhu1
1Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
2University of Notre Dame, Notre Dame, Indiana 46556, USA
3Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
4TANDAR, Buenos Aires, Argentina
5Western Michigan University, Kalamazoo, Michigan 49008, USA
6Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA

Received 7 December 2009; published 24 February 2010

Fusion evaporation cross sections for the 27Al+45Sc (Q=9.63 MeV) system are measured down to about 300 nb. Deviations from standard coupled-channels calculations were observed in this system at the lowest energies. The steep fall-off of the fusion cross sections can be reproduced by calculations using a shallow potential model, which was originally developed to explain the hindrance behavior of heavy-ion fusion in medium-mass systems with negative Q values. Comparisons of the hindrance behavior between the present experiment and other systems, for example, 28Si+30Si (Q=14.3 MeV) and 36S+48Ca (Q=7.55 MeV) are presented.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.81.024611
DOI:
10.1103/PhysRevC.81.024611
PACS:
25.70.Jj, 26.20.Np, 24.10.Eq, 24.10.Ht

*Present address: Los Alamos National Lab, Los Alamos, NM 87545, USA.

 
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