Investigation of incomplete fusion in²⁰Ne +⁵⁵Mn reactions at 3–8 MeV/nucleon

Abstract

The excitation functions of radio-nuclides have been measured for the 20Ne + 55Mn system in the energy range ≈51–164 MeV by employing the recoil catcher technique followed by off-line gamma-ray spectrometry. It has been observed that some of the residues produced directly via complete and/or incomplete fusion (ICF) give rise to independent yield while some of the residues are produced in the decay of higher charge precursor isobars through β+ and/or electron capture and give rise to cumulative yield. Independent yields of radio-nuclides 71, 70As, 69, 67Ge and 67, 66Ga have been separated out from the measured cumulative yields. The measured excitation functions are then compared with statistical model code PACE-2. It has been observed that excitation functions of the measured complete fusion channels are in good agreement with theoretical predictions. However, a significant enhancement in the measured excitation functions for the residues, produced in the break-up of the projectile into α-clusters, has been observed. This enhancement may be attributed to the ICF process. Moreover, ICF-fraction has also been calculated by dividing the ICF-cross-section to the total fusion cross-section and found to increase with the projectile energy as well as with the entrance channel mass-asymmetry of the interacting partners.

Measurement and analysis of excitation functions and observation of mass-asymmetry effect on incomplete fusion dynamics

“…The details of error and uncertainties in the experimentally measured data have been given in our earlier Ref. [9].…”

“…The studies by Morgestern et al [6] carried out experiments on the various projectile target combinations, have brought out the entrance channel mass-asymmetry dependence of ICF reaction, with ICF probability being higher in a mass-asymmetric system than mass-symmetric system at same relative velocity. Later on, studies by Vineyard et al [7] and Chakrabarty et al [8], Ali et al [9] and a e-mail: dsinghiuac@gmail.com…”

“…The entrance channel mass-asymmetry dependence on ICF fraction are also investigated and plotted along with similar data on different projectile-target systems 20 Ne+ 59 Co [10], 16 O + 45 Sc [16] and 16 O + 74 Ge [16]. The present work is a part of ongoing program [9,10,15,[17][18][19] to study the CF and ICF dynamics in heavy ion induced reactions below 10 MeV/nucleon energies. To the best of our knowledge these measurements for the projectile-target system mentioned above have been reported for the first time.…”

Effect of the Target Deformation on Incomplete Fusion Dynamics

“…The major advances in the understanding of ICF dynamics were made after the charged particle-γ coincidence measurements by Inamura et al [3]. Some recent observations [4][5][6] show that at projectile energies above the Coulomb barrier, both the processes complete fusion (CF) and incomplete fusion (ICF) may be considered as dominant reaction mechanisms. Semiclassical theory of heavy ion interaction says that the CF and ICF processes may be categorized on the basis of input angular momentum imparted in the system.…”

Investigation of complete and incomplete fusion dynamics of 20Ne induced reactions at energies above the Coulomb barrier

“…The studies by Morgenstern et al [7] carried out experiments on a various projectile target combinations, have brought out the entrance channel mass-asymmetry dependence of ICF reaction, with ICF probability being higher in a mass-asymmetric system than masssymmetric system at same relative velocity. Some recent measurements [8][9][10] and ICF processes at energies above the Coulomb barrier. Most of the ICF studies have been carried out with low Z-projectile (Z 10), induced reactions on targets of lighter mass (A <100).…”