Study of nuclear structure influencing fusion reactions

J. Khuyagbaatar¹, K. Nishio², D. Ackermann¹, M. Block¹, S. Heinz¹, F.P. Heβberger¹, S. Hofmann¹, H. Ikezoe², B. Kindler¹, B. Lommel¹, H. Makii², S. Mitsuoka², I. Nishinaka², Y. Wakabayashi² and S. Yan^1,3

¹ GSI Helmholzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
² Japan Atomic Energy Agency, 319-1184 Tokai, Ibaraki, Japan
³ China Institute of Atomic Energy, P.O. Box 275 (10), Beijing, China

Published online: 19 October 2011

Abstract

The influence of the nuclear structure of projectile and target nuclei on the capture cross-sections was investigated in the fusion reactions ³⁴S+^204,206,208Pb and ³⁶S+^204,206,208Pb. Capture cross-sections were deduced from the fission fragments measured with multi-wire proportional counters. Significantly enhanced capture-fission cross-sections were observed for the ³⁴S induced reactions compared to ³⁶S at beam energies below the interaction barriers. The experimental results were compared to a coupled-channel calculation. The enhancement was explained by strong couplings to vibrational states of the ³⁴S with ^204,206,208Pb. The capture and evaporation residue cross-sections of ³⁴S+²⁰⁸Pb and ³⁶S+²⁰⁶Pb reactions which lead to the same compound nucleus ²⁴²Cf are compared and discussed.