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

A detailed analysis of the projectile-like fragments detected at backward angles in the reactions 16O, 32S+208Pb 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 pro...

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Main Authors: Hinde D. J., Simenel C., Evers M., Dasgupta M.
Format: Article
Language:English
Published: EDP Sciences 2012-10-01
Series:EPJ Web of Conferences
Online Access:http://dx.doi.org/10.1051/epjconf/20123505005
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spelling doaj-4102905c0dca441e96c1710dfb7c56372021-08-02T03:11:24ZengEDP SciencesEPJ Web of Conferences2100-014X2012-10-01350500510.1051/epjconf/20123505005Sub-barrier transfer in 16O+208Pb and 32S+208Pb and its role in understanding the suppression of fusionHinde D. J.Simenel C.Evers M.Dasgupta M.A detailed analysis of the projectile-like fragments detected at backward angles in the reactions 16O, 32S+208Pb 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 16O and ~ 25MeV for 32S-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. http://dx.doi.org/10.1051/epjconf/20123505005
collection DOAJ
language English
format Article
sources DOAJ
author Hinde D. J.
Simenel C.
Evers M.
Dasgupta M.
spellingShingle Hinde D. J.
Simenel C.
Evers M.
Dasgupta M.
Sub-barrier transfer in 16O+208Pb and 32S+208Pb and its role in understanding the suppression of fusion
EPJ Web of Conferences
author_facet Hinde D. J.
Simenel C.
Evers M.
Dasgupta M.
author_sort Hinde D. J.
title Sub-barrier transfer in 16O+208Pb and 32S+208Pb and its role in understanding the suppression of fusion
title_short Sub-barrier transfer in 16O+208Pb and 32S+208Pb and its role in understanding the suppression of fusion
title_full Sub-barrier transfer in 16O+208Pb and 32S+208Pb and its role in understanding the suppression of fusion
title_fullStr Sub-barrier transfer in 16O+208Pb and 32S+208Pb and its role in understanding the suppression of fusion
title_full_unstemmed Sub-barrier transfer in 16O+208Pb and 32S+208Pb and its role in understanding the suppression of fusion
title_sort sub-barrier transfer in 16o+208pb and 32s+208pb and its role in understanding the suppression of fusion
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2012-10-01
description A detailed analysis of the projectile-like fragments detected at backward angles in the reactions 16O, 32S+208Pb 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 16O and ~ 25MeV for 32S-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.
url http://dx.doi.org/10.1051/epjconf/20123505005
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