Study on the compound nucleus fusion probability PCN in 12C +93Nb reaction at above barrier energies using different degrees-of-freedom

Abstract

In this work, we extend our earlier study [S. Chopra, Hemdeep, A. Kaur and R. K. Gupta, Phys. Rev. C 93 (2016) 024603] of [Formula: see text] reaction at below- and near- to above-barrier energies for both coplanar ([Formula: see text]) and noncoplanar ([Formula: see text]) degrees-of-freedom. Our main aim is to see the texture of variation of compound nucleus (CN) fusion probability [Formula: see text] at all the experimentally available center-of-mass energies ([Formula: see text]) in the range 41–69[Formula: see text]MeV, using the dynamical cluster-decay model (DCM). In this study, we worked for both degrees-of-freedom, having compact configurations ([Formula: see text]) and including higher multipole deformations (quadrupole to hexadecapole, [Formula: see text]) of nuclei. In the work of above-mentioned reference, for [Formula: see text]Ag[Formula: see text] (weakly fissioning nuclear system), we found a discrepancy in [Formula: see text], i.e., increasing function with increasing [Formula: see text], belongs to superheavy nuclei for the case of [Formula: see text] [see Fig. Fig.4 of [A. Kaur, S. Chopra and R. K. Gupta, Phys. Rev. C 90 (2014) 024619], but this erroneous result moved to correct one after the inclusion of [Formula: see text] (decreasing with increasing [Formula: see text], weakly fissioning class), which encouraged us to check the trend of [Formula: see text] at all available energies. Our evaluation framework shows the noncoplanar configuration, with higher multipole deformations [Formula: see text] included, as the most probable configuration for studying the heavy-ion reactions [S. Chopra, Hemdeep, P. Kaushal and R. K. Gupta, Phys. Rev. C 98 (2018) 041603(R)]. Second, our interest is to check the consistency of experimental data, where the experimentalists have given the data with the mixing of three different experiments for same reaction. In this study, we have found that our results are in good agreement and consistent with only the latest experimental data at five [Formula: see text]’s (=41.097, 47.828, 54.205, 60.051 and 65.454[Formula: see text]MeV), i.e., showing large ([Formula: see text]90%) noncompound nucleus contribution (or equivalently quasi-fission/Incomplete fusion) in the (total) fusion cross-section.