Elsevier

Physics Letters B

Volume 251, Issue 1, 8 November 1990, Pages 17-22
Physics Letters B

Sum rule approach to decoupled giant dipole state

https://doi.org/10.1016/0370-2693(90)90224-TGet rights and content

Abstract

We show that the loosely bound neutrons in 11Li give rise to a decoupled dipole state at the excitation energy Ex=1.6 MeV exhausting 8% of the TKR sum rule. On the other hand, there are no such low excited states in 9Li. The decoupled dipole state in 11Li enhances the electromagnetic dissociation cross sections on various targets which explain well the observed cross sections at high bombarding energy Elab/A=800 MeV.

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This work is supported financially by the Grant-in-Aid for General Scientific Research (No. 63540206 and No. 02402005) by the Ministry of Education, Science and Culture.

1

We thank W. Bentz for his critical reading of the manuscript and K. Yazaki for enlightening discussions.

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