Fusion around the barrier in $^{11,9}$Be + $^{209}$Bi

C. Signorini; Z.H. Liu; A. Yoshida; T. Fukuda; Z.C. Li; K.E.G. Löbner; L. Müller; Y.H. Pu; K. Rudolph; F. Soramel; C. Zotti; J.L. Sida

doi:doi:10.1007/s100500050111

EPJ

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2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A 2, 227-231

Short note

Fusion around the barrier in ^11,9Be + ²⁰⁹Bi

C. Signorini¹ - Z.H. Liu^2,8 - A. Yoshida³ - T. Fukuda⁴ - Z.C. Li^1,8 - K.E.G. Löbner⁵ - L. Müller¹ - Y.H. Pu³ - K. Rudolph⁵ - F. Soramel⁶ - C. Zotti⁵ - J.L. Sida⁷

¹ Physics Department of University and INFN, via Marzolo 8, I-35131 Padova, Italy
² INFN, Legnaro National Laboratories, Legnaro, Padova, Italy
³ RIKEN, Hirosawa, Wako, Saitama, 351-01 Japan
⁴ INS, The University of Tokyo, Midori-cho, Tanashi, 188 Tokyo, Japan
⁵ Sektion Physik, Ludwigs-Maximilian University, D-85748 Garching, Germany
⁶ Physics Department of University and INFN, via delle Scienze 208, I-33100 Udine, Italy
⁷ CEA/DSN/DAPNIA Saclay, F-91191 Gif sur Yvette, France
⁸ China Institute of Atomic Energy, P.O.Box 275(10), Beijing 102413, P.R.of China

Received: 2 April 1998 Communicated by B. Povh

Abstract
The ⁹Be + ²⁰⁹Bi fusion cross sections were measured in the range 37.5 MeV $\leq$ E_lab $\leq$ 45.0 MeV at the Munich Tandem via the observation of ground state $\alpha$ -decay of the evaporation residues. Fusion cross sections of ²⁰⁹Bi with the "halo" ¹¹Be unstable projectile in the region around the Coulomb barrier were deduced from an experiment done with the same technique at the RIKEN Ring Cyclotron. Above the Coulomb barrier the ¹¹Be cross sections are larger than the ⁹Be ones in agreement with theoretical predictions based on the larger ¹¹Be halo radius. Also below the barrier these theories foresee the same behavior in disagreement with the experimental results, since the two cross sections are rather similar.