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Unusual Threshold Anomaly in the 6Li+208Pb System |
ZHANG Chun-Lei1,2;ZHANG Huan-Qiao1,2;LIN Cheng-Jian3;RUAN Ming2;LIU Zu-Hua2;YANG Feng2;WU Xiu-Kun2;ZHOU Ping2;AN Guang-Peng2;JIA Hui-Ming2;WU Zhen-Dong2;XU Xin-Xing2;BAI Chun-Lin1,2 |
1School of Physics, Peking University, Beijing 100871
2China Institute of Atomic Energy, Beijing 102413 |
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Cite this article: |
ZHANG Chun-Lei, ZHANG Huan-Qiao, LIN Cheng-Jian et al 2006 Chin. Phys. Lett. 23 1146-1149 |
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Abstract The angular distributions of elastic scattering for the 6Li +208Pb system have been measured at several energies around the Coulomb barrier. The parameters of optical potential are extracted by means of a phenomenological optical model analysis. It is found that the real and imaginal potentials show a pronounced energy dependence. The behaviour of the potential at the nearly especially sub-barrier energies in the 6Li+208Pb system is quite different from the results of some previous reports observed in other systems, such as 19F+208Pb and 16O+208Pb. This unusual threshold phenomenon indicates that breakup channel is strongly coupled with the elastic channel and has obvious effects on optical potential.
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Keywords:
24.10.Eq
24.10.Ht
25.70.Bc
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Published: 01 May 2006
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PACS: |
24.10.Eq
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(Coupled-channel and distorted-wave models)
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24.10.Ht
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(Optical and diffraction models)
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25.70.Bc
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(Elastic and quasielastic scattering)
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