Pre-compound emission in low-energy heavy-ion interactions
Department of Physics, Sri Varsheny (Post Graduate) College, Aligarh (UP) - 202 001, India
2 Department of Physics, Aligarh Muslim University, Aligarh 202 002, India
3 NP-Group, Inter University Accelerator Centre, New Delhi - 110 067, India
4 Department of Physics, Indian Institute of Technology Ropar, Punjab 140 001, India
5 Department of Physics, University of Petroleum and Energy Studies, Dehradun - 248 007, India
6 Department of Physics and Astrophysics, Delhi University, Delhi- 110007 India
Published online: 22 November 2017
Recent experimental studies have shown the presence of pre-compound emission component in heavy ion reactions at low projectile energy ranging from 4 to 7 MeV/nucleons. In earlier measurements strength of the pre-compound component has been estimated from the difference in forward-backward distributions of emitted particles. Present measurement is a part of an ongoing program on the study of reaction dynamics of heavy ion interactions at low energies aimed at investigating the effect of momentum transfer in compound, precompound, complete and incomplete fusion processes in heavy ion reactions. In the present work on the basis of momentum transfer the measurement of the recoil range distributions of heavy residues has been used to decipher the components of compound and pre-compound emission processes in the fusion of 16O projectile with 159Tb and 169Tm targets. The analysis of recoil range distribution measurements show two distinct linear momentum transfer components corresponding to pre-compound and compound nucleus processes are involved. In order to obtain the mean input angular momentum associated with compound and pre-compound emission processes, an online measurement of the spin distributions of the residues has been performed. The analysis of spin distribution indicate that the mean input angular momentum associated with pre-compound products is found to be relatively lower than that associated with compound nucleus process. The pre-compound components obtained from the present analysis are consistent with those obtained from the analysis of excitation functions.
© The Authors, published by EDP Sciences, 2017
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