Effect of Closed Shell Structure on Heavy-Ion Fusion Reactions

The effect of the nuclear shell structure on the heavy-ion fusion reaction was investigated for the reaction systems 82Se + 138Ba, 82Se + 134Ba, 16O + 204Pb, 86Kr + 134Ba, 86Kr + 138Ba, and 82Se + nat.Ce. Evaporation residues for these fusion reactions were measured using a recoil mass separator (JA...

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Main Authors: Ikezoe, Hiroshi, Mitsuoka, Sinichi, Nishio, Katsuhisa, Tsuruta, Kaoru, Satou, Ken-ichiro, Institute of Physics, University of Tsukuba, Tsukuba-shi, Ibaraki 305-8577, Tandem Accelerator Center, University of Tsukuba, Tsukuba-shi, Ibaraki 305-8577, Jeong, S.-C., Lin, C.-J.
Format: Conference Proceeding
Language:English
Subjects:
BARIUM 134
BARIUM 138
COMPOUND NUCLEI
COULOMB FIELD
CROSS SECTIONS
EVAPORATION MODEL
EXCITATION
FISSION
HEAVY ION FUSION REACTIONS
JAERI
KRYPTON 86
LEAD 204
MEV RANGE
NUCLEAR PHYSICS AND RADIATION PHYSICS
OXYGEN 16
SELENIUM 82
SHELL MODELS
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Summary:The effect of the nuclear shell structure on the heavy-ion fusion reaction was investigated for the reaction systems 82Se + 138Ba, 82Se + 134Ba, 16O + 204Pb, 86Kr + 134Ba, 86Kr + 138Ba, and 82Se + nat.Ce. Evaporation residues for these fusion reactions were measured using a recoil mass separator (JAERI-RMS) near Coulomb barrier region. The measured evaporation residue cross sections for the reactions 82Se + 138Ba and 86Kr + 138Ba were two orders of magnitude and one order of magnitude larger than those for the reaction 82Se + 134Ba and 86Kr + 134Ba, respectively, at the excitation energy region of 10 {approx} 30 MeV. The evaporation residue cross sections were compared with those of the other reaction systems that make the same or similar compound nuclei as the present reaction systems. It was found that the evaporation residue cross sections correlate strongly with the sum of the shell energies for both projectile and target nuclei, i.e., the evaporation residue cross sections increase as the sum of the shell energy decreases.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.1737098