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Volume 281 - The 26th International Nuclear Physics Conference (INPC2016) - Nuclear Reactions – Monday 12
The Threshold Anomaly Of Optical Potentials And The Dispersion Relation For Weakly-bound Nuclear Systems
C. Lin,* L. Yang, H.M. Jia, D.X. Wang, N.R. Ma, L.J. Sun, F. Yang, Z.D. Wu, X.X. Xu, H.Q. Zhang, Z.H. Liu
*corresponding author
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Pre-published on: 2017 May 04
Published on: 2017 May 09
Angular distributions of transfer reaction $^{208}$Pb($^{7}$Li,$^{6}$He)$^{209}$Bi
were measured at $E_{\mathrm{lab}}$($^7$Li) = 21.2, 24.3, 25.67, 28.55, 32.55, 37.55 and 42.55 MeV.
By fitting the experimental data with the theoretical frameworks
of Distorted Wave Born Approximation (DWBA), the optical
model parameters of halo nuclear system $^{6}$He + $^{209}$Bi were extracted.
The breakup threshold anomaly (BTA) was observed clearly in
the imaginary potential, and a further decreasing trend in the deep sub-barrier region
was observed for the first time in a halo system.
Furthermore, the dispersion relation is found of
no use to describe the connection between the real and imaginary parts.
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