Systematic analysis of hot Yb* isotopes using the energy density formalism

Deepika Jain; Manoj K. Sharma; Raj Kumar; Raj K. Gupta

doi:10.1140/epja/i2014-14155-1

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2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A (2014) 50: 155
https://doi.org/10.1140/epja/i2014-14155-1

Regular Article - Theoretical Physics

Systematic analysis of hot Yb^* isotopes using the energy density formalism

Deepika Jain¹, Manoj K. Sharma¹^*, Rajni¹, Raj Kumar² and Raj K. Gupta³

¹ School of Physics and Materials Science, Thapar University, 147004, Patiala, India
² Department of Physics and Astronomy, University of Padova, 35131, Padova, Italy
³ Department of Physics, Panjab University, 160014, Chandigarh, India

^* e-mail: msharma@thapar.edu

Received: 26 June 2014
Revised: 15 September 2014
Accepted: 24 September 2014
Published online: 23 October 2014

Abstract

A systematic study of the spin-orbit density interaction potential is carried out, with spherical as well as deformed choices of nuclei, for a variety of near-symmetric and asymmetric colliding nuclei leading to various isotopes of the compound nucleus Yb^*, using the semiclassical extended Thomas-Fermi formulation (ETF) of the Skyrme energy density formalism (SEDF). We observe that the spin-orbit density interaction barrier height ( $V_{JB}$ and barrier position ( $R_{JB}$ increase systematically with the increase in number of neutrons in both the projectile and target, for spherical systems. On allowing deformation effects with optimum orientations, the barrier-height increases by a large order of magnitude, as compared to the spherical case, in going from ¹⁵⁶Yb^* to ¹⁷²Yb^* nuclear systems formed via near-symmetric Ni+Mo or asymmetric O+Sm colliding nuclei, except that for the oblate-shaped nuclei, the $V_{JB}$ is the highest and $R_{JB}$ shifts towards a smaller (compact) interaction radius. The temperature does not change the behavior of spin-orbit density dependent ( $V_{J}$ and independent ( $V_{P}$ interaction potentials, except for some minor changes in the magnitude. The orientation degree of freedom also plays an important role in modifying the barrier characteristics and hence produces a large effect on the fusion cross section. The fusion excitation function of the compound nuclei ^{160, 164}Yb^* formed in different incoming channels, show clearly that the new forces GSkI and KDE0v1 respond better than the old SIII force. Among the first two, KDE0v1 seems to perform better. The fusion cross-sections are also predicted for a few other isotopes of Yb^*.