Effects of entrance channels on the deexcitation properties of the same compound nucleus formed by different pairs of collision partners

Abstract

The properties of deexcitation of the same ${}^{220}$Th compound nucleus (CN) formed by different mass (charge) asymmetric reactions are investigated. It is demonstrated that the effective fission barrier $<B_{\mathrm{fis}}>$ value being a function of the excitation energy $E_{\mathrm{CN}}^{\ast }$ is strongly sensitive to the various orbital angular momentum $L=\ell \hslash$ distributions of CN formed with the same excitation energy $E_{CN}^{\ast }$ by the very different entrance channels ${}^{16}$O+${}^{204}$Pb, ${}^{40}$Ar+${}^{180}$Hf, ${}^{82}$Se+${}^{138}$Ba and ${}^{96}$Zr+${}^{124}$Sn. Consequently, the competition between the fission and evaporation of light particles (neutron, proton, and $\alpha$-particle) processes along the deexcitation cascade of CN depends on the orbital angular momentum distribution of CN. Therefore, the ratio between the evaporation residue cross sections obtained after emission of neutral and charged particles and neutrons only for the same CN with a given excitation energy $E_{CN}^{\ast }$ is sensitive to the mass (charge) asymmetry of reactants in the entrance channel.

arXiv comment9 pages, 6 figures, 2 tables, Accepted for publication on Phys. Rev. C

References in corpus (5)

• Investigation on the 48Ca+249-252Cf reactions synthesizing isotopes of the superheavy element 118
• Angular anisotropy of the fusion-fission and quasifission fragments
• Role of the target orientation angle and orbital angular momentum in the evaporation residue production
• Quasifission and difference in formation of evaporation residues in the ${}^{16}$O+${}^{184}$W and ${}^{19}$F+${}^{181}$Ta reactions
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Cited by in corpus (2)

• Advantages of the multinucleon transfer reactions based on 238U target for producing neutron-rich isotopes around N = 126
• Role of charged particle emission on the evaporation residue formation in the ${}^{82}$Se+${}^{138}$Ba reaction leading to the ${}^{220}$Th compound nucleus