Observation of complete- and incomplete-fusion components in 159 Tb , 169 Tm ( 16 O , x) reactions: Measurement and analysis of forward recoil ranges at E/A ≈ 5-6 MeV (original) (raw)

2007, European Physical Journal A

With a view to study complete-and incomplete-fusion components in 159 Tb, 169 Tm( 16 O, x) reactions, experiments have been carried out at the Inter-University Accelerator Center, New Delhi, India using the 15UD Pelletron accelerator facilities. The forward mean recoil ranges for some radio-nuclides; 168m Lu, 167 Lu, 167 Yb, 166 Tm produced in the 16 O + 159 Tb system at ≈ 90 MeV, and 179 Re, 177 Re, 177 W, 178 Ta and 177 Hf produced in the 16 O + 169 Tm system at ≈ 87 MeV have been measured. The recoilcatcher activation technique followed by off-line γ-spectrometry has been employed in the present work. The analysis of forward mean ranges for different radio-nuclides has been done in the framework of the degree of linear momentum transfer from projectile to target nucleus by adopting break-up fusion model considerations. Different complete-and incomplete-fusion components, which may be attributed to the fusion of 16 O and/or 12 C and 8 Be transfer from the 16 O projectile to the target nucleus have been observed. An attempt has also been made to separate out the relative percentage contributions of complete-and incomplete-fusion components using experimentally measured forward recoil ranges. The complete-fusion contributions deduced from recoil range distribution are found to be consistent with the prediction of the theoretical model code PACE. The analysis of data indicates the complete-and incomplete-fusion competition for both the systems at the given energies.

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