Analysis of the role of neutron transfer in asymmetric fusion reactions at subbarrier energies
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CLEI Experiment
Analysis of the Role of Neutron Transfer in Asymmetric Fusion Reactions at Subbarrier Energies A. A. Ogloblin1) , H. Q. Zhang2) , C. J. Lin2) , H. M. Jia2), S. V. Khlebnikov3), E. A. Kuzmin1) , A. N. Danilov1) , A. S. Demyanova1) , W. H. Trzaska4), X. X. Xu2), F. Yang2) , V. V. Sargsyan5), 6)* , G. G. Adamian5) , N. V. Antonenko5) , and W. Scheid7) Received April 13, 2015
Abstract—The excitation functions were measured for the 28 Si + 208 Pb complete-fusion (capture) reaction at deep subbarrier energies. The results were compared with the cross sections predicted within the quantum diffusion approach. The role of neutron transfer in the case of positive Q values in the 28 Si + 124 Sn, 208 Pb; 30 Si + 124 Sn, 208 Pb; 20 Ne + 208 Pb; 40 Ca + 96 Zr; and 134 Te + 40 Ca complete-fusion (capture) reactions is discussed. DOI: 10.1134/S1063778815080116
1. INTRODUCTION A significant role of the static deformation of nuclei and neutron transfer in subbarrier complete fusion (capture) was highlighted in a number of studies [1, 2]. There are several experimental evidences in support of the statement that nuclear deformations are of importance in fusion reactions. The effect of nuclear deformation is as follows. If a target nucleus is prolate in the ground state, the Coulomb barrier is lower at its tip than at its side. This leads to an increase in the fusion or capture probability at subbarrier energies in relation to the case of spherical nuclei. The role of neutron transfer in subbarrier fusion is less clear. In the fusion (capture) of nuclei, the importance of the neutron-transfer processes where Q values are positive is due to the fact that the transfer of neutrons, which are insensitive to the Coulomb barrier, may proceed over long distances before projectile capture by a target nucleus [3]. It is common practice to 1)
National Research Center Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182 Russia. 2) China Institute of Atomic Energy, Post Office Box 275, 102413, Beijing, China. 3) Khlopin Radium Institute, Vtoroi Murinskii pr. 28 , SaintPetersburg, 194021 Russia. 4) ¨ ¨ Survontie 9, Department of Physics, University of Jyvaskyl a, ¨ ¨ Finland. FI-40500 Jyvaskyl a, 5) Joint Institute for Nuclear Research, ul. Joliot-Curie 6, Dubna, Moscow oblast, 141980 Russia. 6) Yerevan State University, Alek Manukyan str. 1, Yerevan 0025, Republic of Armenia. 7) ¨ fur ¨ Theoretische Physik der Justus-Liebig-UniInstitut ¨ D-35392, Giessen, Germany. versitat, * E-mail: [email protected]
assume that the cross sections for subbarrier fusion increase owing to neutron transfer [4–9]. Nevertheless, available experimental data and theoretical investigations are insufficient for unambiguously determining the role of the neutron-transfer channel in fusion (capture) processes [10–21]. Therefore, further studies are required. The quantum diffusion approach [22] was applied to studying the role of two-neutron transfer with a positive Q2n value in fusion (capture) reactions at subbarrier and near- and above-barrier en
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