Sub-barrier Fusion Enhancement in Neutron-Rich Radioactive ¹³²Sn on ⁶⁴Ni

Conference · Sat May 01 04:00:00 EDT 2004

OSTI ID:931530

Liang, J Felix ^[1]; Shapira, Dan ^[1]; Gross, Carl J ^[1]; Beene, James R ^[1]; Bierman, Jeff D ^[2]; Gomez Del Campo, Jorge ^[1]; Hausladen, Paul ^[1]; Larochelle, Y ^[3]; Loveland, Walter ^[4]; Mueller, Paul Edward ^[1]; Peterson, Don ^[4]; Radford, David C ^[1]; Stracener, Daniel W ^[1]; Varner, Jr, Robert L ^[1]

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1. ORNL
2. Gonzaga University
3. University of Tennessee
4. Oregon State University

Evaporation residue cross sections have been measured using neutron-rich radioactive 132Sn beams incident on a 64Ni target in the vicinity of the Coulomb barrier. This is the first experiment using accelerated 132Sn beams to study nuclear reaction mechanisms. The average beam intensity was 2x 104 particles per second and the smallest cross section measured was less than 5 mb. A large sub-barrier fusion enhancement was observed compared to evaporation residue cross sections for 64Ni on stable even Sn isotopes. The enhancement cannot be accounted for by a simple barrier shift due to the change in nuclear sizes. Coupled-channel calculations including inelastic excitation underpredict the measured cross sections below the barrier. The presence of several neutron transfer channels with large positive Q values suggests that multinucleon transfer may play an important role in enhancing the fusion of 132Sn and 64Ni.

• Research Organization: Oak Ridge National Laboratory (ORNL); Holifield Radioactive Ion Beam Facility
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931530
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COULOMB FIELD
CROSS SECTIONS
EVAPORATION
EXCITATION
MICROSCOPES
NEUTRON TRANSFER
NICKEL 64
NUCLEAR REACTIONS
RESIDUES
TARGETS
TIN 132
TUNNELING