Incomplete fusion reactions at low energies in ¹³C+¹⁶⁹Tm system

¹ Department of Physics, Aligarh Muslim University, Aligarh - 202 002, (U.P.), India
² GSI Helmholtz Centre for Heavy Ion Research GmbH, Planckstasse 1, D-64291 Darmstadt, Germany
³ NP Group, Inter University Accelerator Centre, New Delhi - 110 067, (U.P.), India
⁴ Physics Department, S. V. College, Aligarh - 202 001, (U.P.), India
⁵ Physics Department, Agra College, Agra - 282 001, (U.P.), India

^a e-mail: phy.vijayraj@gmail.com

Published online: 20 March 2014

Abstract

Aiming to investigate the incomplete fusion processes at low projectile energies, experiments have been carried out for the ¹³C + ¹⁶⁹Tm system at ≈ 4-7 MeV/A. Excitation functions for several heavy residues likely to be populated via complete and incomplete fusion processes have been measured using heavy recoil residue catcher technique followed by γ- ray spectroscopy. The measured cross-sections for the complete fusion (xn and pxn) channels are compared with the statistical model code PACE4, consistently using the same set of parameters. The complete fusion channels are found to be consistent with the model calculations. However, the cross-sections for all the measured α-emitting channels are found to be significantly enhanced over the calculations. Analysis of data indicate a significant fraction of incomplete fusion even at energies as low as 17% above barrier. The present results are discussed in light of the Morgenstern’s systematics. Incomplete fusion strength function is found to be relatively large for alpha cluster projectile i.e. for ¹²C as compared to one neutron excess ¹³C projectile.