Incomplete fusion analysis of the Li7-induced reaction on Nb93 within 3–6.5 MeV/nucleon

Deepak Kumar and Moumita Maiti
Phys. Rev. C 96, 044624 – Published 30 October 2017

Abstract

Background: It is understood from the recent experimental studies that prompt/resonant breakup, and transfer followed by breakup in the weakly bound Li6,7-induced reactions play a significant role in the complete-incomplete fusion (CF-ICF), suppression/enhancement in the fusion cross section around the Coulomb barrier.

Purpose: Investigation of ICF over CF by measuring cross sections of the populated residues, produced via different channels in the Li7-induced reaction on a Nbnat target within the 3–6.5 MeV/nucleon energy region.

Method: The Li7 beam was allowed to hit the self-supporting Nb93 targets, backed by the aluminium (Al) foil alternately, within 3–6.5 MeV/nucleon energy. Populated residues were identified by offline γ-ray spectrometry. Measured excitation functions of different channels were compared with different equilibrium and pre-equilibrium models.

Result: The enhancement in cross sections in the proton (2030 MeV) and α-emitting channels, which may be ascribed to ICF, was observed in the measured energy range when compared to the Hauser-Feshbach and exciton model calculations using empire, which satisfactorily reproduces the neutron channels, compared to the Weisskopf-Ewing model and hybrid Monte Carlo calculations. The increment of the incomplete fusion fraction was observed with rising projectile energy.

Conclusion: Contrary to the alice14, experimental results are well reproduced by the empire throughout the measured energy range. The signature of ICF over CF indicates that the breakup/transfer processes are involved in the weakly bound Li7-induced reaction on Nb93 slightly above the Coulomb barrier.

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  • Received 30 August 2017

DOI:https://doi.org/10.1103/PhysRevC.96.044624

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Deepak Kumar and Moumita Maiti*

  • Department of Physics, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India

  • *moumifph@iitr.ac.in, moumifph@gmail.com

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Issue

Vol. 96, Iss. 4 — October 2017

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