Eur. Phys. J. A (2019) 55: 164
https://doi.org/10.1140/epja/i2019-12860-9

Regular Article - Experimental Physics

Probing incomplete fusion dynamics and role of the projectile deformation in the ¹⁹F + ¹⁵⁴Sm system

¹ Department of Physics, Central University of Jharkhand, 835 205, Ranchi, India
² Radio-chemistry Division, Bhabha Atomic Research Centre, 400 085, Mumbai, India
³ Department of Physics, Aligarh Muslim University, 202 002, Aligarh, India
⁴ Department of Physics, Jamal Mohamed College, 620 020, Tiruchirappalli, India
⁵ Department of Physics, G.F. (P.G.), College, 242 001, Shahjahanpur, India
⁶ Nuclear Physics Group, Inter-University Accelerator Centre, Aruna Asaf Ali Marg, 110 067, New Delhi, India

^* e-mail: dsinghcuj@gmail.com

Received: 4 May 2019
Accepted: 15 August 2019
Published online: 27 September 2019

Abstract

Transition intensity distributions for evaporation residues ^169-166 Lu(xn), ^{168, 167}Yb(pxn), ^{168, 165, 164} Tm , ¹⁶⁵ Er , ¹⁶² Ho and ^163-160 Dy populated through complete and incomplete fusion in the ¹⁹F + ¹⁵⁴Sm system have been measured. The feeding intensity patterns of incomplete fusion channels are found to have a narrow range feeding only for high spin states, while complete fusion channels are strongly fed over a broad spin range and widely populated. A comparative study of present measurements shows the effect of projectile deformation along with entrance channel mass asymmetry. Further, comparison of present results with the literature suggests that the mean input angular momentum values are relatively larger in the collision of a deformed projectile with a deformed target than that in the collision of a spherical projectile with a deformed target at the same relative velocity of incident projectile. However, ICF dynamics has also been found to be influenced by relative orientations (i.e. tip-tip or side-side) of the interacting partners. It means that there is more involvement of peripheral collisions between the deformed-deformed nuclei. The present analysis also shows that there is a projectile dependence on ICF dynamics, which would require more investigation. Present results of mean input angular momenta for different evaporation residues highlight the role of projectile deformation and orientations of interacting nuclei in the dynamics of incomplete fusion as well as complete fusion.