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Influence of breakup on elastic and α-production channels in the ^6Li＋^116Sn reaction

Chinese Physics C 2017年第10期41卷 72-78页

作者： D.Patel S.Mukherjee N.Deshmukh J.Lubian 王建松 T.Correa B.K.Nayak 杨彦云马维虎 D.C.Biswas Y.K.Gupta S.Santra E.T.Mirgule L.S.Danu N.L.Singh A.Saxena CAS Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Department of Physics Faculty of Science The M. S. University of Baroda Vadodara-390002 India INFN Laboratori Nazionali del Sud Catania Italy Instituto de Flsica Universidade Federal Fluminense Av. Litoranea s/n GragoatA Niteroi R.J. 24210-340 Brazil Instituto de AplicaCAo Fernando Rodrigues da Silveira Universidade do Estado do Rio de Janeiro R. Santa Alexandrina 288 Rio Comprido Rio de Janeiro R J 20261-232 Brazil Nuclear Physics Division Bhabha Atomic Research Centre Mumbai-400085 India

The effects of breakup reactions on elastic and α-production channels for the ^6Li＋^116Sn system have been investigated at energies below and near the Coulomb barrier. The angular distributions of α-particle production differential cross sections have been obtained at several projectile energies between 22 and 40 MeV. The measured breakup α-particle differential cross sections and elastic scattering angular distributions have been compared with the predictions of continuum-discretized coupled channels（CDCC） calculations. The influence of breakup coupling has also been investigated by extracting dynamic polarization potentials（DPP） from the CDCC calculations. From the predictions of CDCC calculations the relative importance of the nuclear, Coulomb, and total breakup contributions have also been investigated. The nuclear breakup couplings are observed to play an important role in comparison to the Coulomb breakup for the direct breakup mechanisms associated in the reaction of ~6Li projectile with ^（116）Sn target nuclei. The influence of strong nuclear breakup coupling exhibits suppression in the Coulomb-nuclear interference peak. The direct breakup cross sections from the CDCC calculations under-predict the measured α-particle differential cross sections at all energies. This suggests that the measured α particles may also have contributions from other possible breakup reaction channels.

关键词： α-elastic scattering -production channels breakup coupling effects dynamic polarization potentials

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