Hindrance of complete fusion in the Li-8+Pb-208 system at above-barrier energies

Authors

E. F. Aguilera, Inst Nacl Invest Nucl
E. Martinez-Quiroz, Inst Nacl Invest Nucl
P. Rosales, Inst Nacl Invest Nucl
J. J. Kolata, University of Notre Dame
Paul DeYoung, Hope CollegeFollow
Graham F. Peaslee, Hope CollegeFollow
P. Mears, Hope College
C. Guess, Hope College
F. D. Becchetti, University of Michigan - Ann Arbor
J. H. Lupton, University of Michigan - Ann Arbor
Yu Chen, University of Michigan - Ann Arbor

Document Type

Article

Publication Date

10-2009

Publication Source

Physical Review C

Volume Number

80

Issue Number

4

Publisher

American Physical Society

ISSN

0556-2813

Comments

Article Number: 044605

Abstract

The At-211,At-212 yields resulting from the interaction of the radioactive projectile Li-8 with a Pb-208 target have been measured at energies between 3 and 8.5 MeV above the Coulomb barrier. They are signatures for fusion of the whole charge but not necessarily the whole mass of the projectile, so they are included in a corresponding operational definition of complete fusion. Within this definition, a fusion suppression factor of 0.70 +/- 0.02 (stat.) +/- 0.04 (syst.) is deduced from a comparison to a one-dimensional barrier-penetration-model calculation using parameters extrapolated from values for Li-6,Li-7 + Bi-209 and Be-9 + Pb-208 taken from the literature. Possible incomplete fusion processes are discussed and the results are fitted with a phenomenological model assuming breakup prior to fusion followed by capture of a Li-7 fragment.

Recommended Citation

Published in: Physical Review C, Volume 80, Issue 4, October 1, 2009. Copyright © 2009 American Physical Society, College Park, MD. The final published version is available at: http://dx.doi.org/10.1103/PhysRevC.80.044605