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Directional distribution of high-energy gamma rays from hot 125, 127Cs and 171Lu compound nuclei
Affiliation:1. Key Laboratory of Advanced Functional Materials, School of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, PR China;2. Beijing Key Lab of Cryobiomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 100190 Beijing, PR China;3. Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191 Beijing, PR China;4. Department of Physics, Dongguk University, Seoul 04620, Republic of Korea
Abstract:
Gamma-gamma directional correlations have been measured following 12C + 113,115In and 159Tb reactions at 100 MeV. Directional distribution coefficients have been determined for the gamma-ray spectrum between 2 and 16 MeV. For energies above 10 MeV the results for both reactions are in disagreement with interpretations in terms of the decay of the giant dipole resonance statistically excited either in a permanently deformed prolate compound nucleus undergoing collective rotation or an oblate nucleus with the angular momentum along the axis of symmetry. For the reaction on Tb indications of a quadrupole component at energies around 10 MeV are presented.
Keywords:
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