Eur. Phys. J. A 10, 373-379

Measurement of fusion excitation functions of ^27,29,31Al + ¹⁹⁷Au

Y.X. Watanabe¹, A. Yoshida², T. Fukuda³, T. Sekine⁴, Y. Watanabe², H. Ikezoe⁵, Y. Nagame⁵, T. Ikuta⁵, I. Nishinaka⁵, Y. Mizoi³, J. Nakano³, M. Hirai¹, H. Sakurai¹, H. Kobinata¹, Y. Pu², K. Kimura⁶ and M. Ishihara<sup>1, 2

1</sup>  Department of Physics, Faculty of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8654, Japan
²  RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
³  Institute for Nuclear Study, University of Tokyo (INS), 3-2-1 Midori-cho, Tanashi, Tokyo 188-0002, Japan
⁴  Faculty of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
⁵  Japan Atomic Energy Research Institute, 2-4 Shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
⁶  Faculty of Engineering, Nagasaki Institute of Applied Science, 536 Aba-machi, Nagasaki, Nagasaki 851-0193, Japan

yutaka@rarfaxp.riken.go.jp

(Received: 13 March 2001 / Revised version: 20 April 2001 Communicated by C. Signorini)

Abstract
A systematic study of the sub-barrier fusion reactions with neutron-rich projectiles has been carried out for three isotopes ^27,29,31Al bombarding a ¹⁹⁷Au target. A target chamber equipped with a target stack and sets of MWPC was employed in order to enhance the efficiency of the radioactive beam experiment. Coupled-channel calculations including the quadrupole excitations do not well fit the measured fusion excitation functions, whereas flat barrier distributions to represent the coupling to the neutron transfer largely account for the observed enhancement of the sub-barrier fusion cross-sections.

PACS
25.60.Pj - Fusion reactions.
25.70.Jj - Fusion and fusion-fission reactions.

© Società Italiana di Fisica, Springer-Verlag 2001