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Sub-barrier transfer in 16O+ Pb and 32S+ 208Pb and its role in understanding the suppression of fusion.

Authors :
Evers, M.
Dasgupta, M.
Hinde, D.J.
Simene, C.
Source :
EPJ Web of Conferences; 2012, Issue 35, preceding p05005-p.2-05005-p.4, 4p
Publication Year :
2012

Abstract

A detailed analysis of the projectile-like fragments detected at backward angles in the reactions <superscript>16</superscript>O, <superscript>32</superscript>S+<superscript>208</superscript>Pb at energies below the fusion barrier is presented. Excitation functions corresponding to nucleon transfer with ΔZ = 1 and ΔZ = 2 were extracted, indicating surprisingly large absolute probabilities at sub-barrier energies. A comparison of 2p transfer probabilities with time-dependent Hartree-Fock calculations suggests strong pairing correlations between the two protons. Excitation energies in the projectile-like fragments up to ~ 15MeV for the <superscript>16</superscript>O and ~ 25MeV for <superscript>32</superscript>S-induced reactions demonstrate the population of highly excited states in the residual nuclei, indicating substantial dissipation of kinetic energy. These highly inelastic (large excitation energies) and complex (correlated few-nucleon transfer) processes may be closely related to the depletion of fusion through tunnelling at sub-barrier energies. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
21016275
Issue :
35
Database :
Complementary Index
Journal :
EPJ Web of Conferences
Publication Type :
Conference
Accession number :
84396696
Full Text :
https://doi.org/10.1051/epjconf/20123505005