Elsevier

Physics Letters B

Volume 287, Issue 4, 13 August 1992, Pages 307-311
Physics Letters B

Determination of the density distribution and the correlation of halo neutrons in 11Li

https://doi.org/10.1016/0370-2693(92)90988-GGet rights and content

Abstract

Interaction cross sections (σ1) and transverse momentum Pt distributions of 9Li fragments in 11Li reactions were measured 1467 using p and d targets at 800A MeV, and Be and C targets at 400A MeV. The density distribution of the 11Li nucleus has been determined for the first time from these σI's. It is confirmed that only a distribution with a long tail (halo) consistently reproduces the observed data. From a combined analysis of Pt distributions of 9Li and of neutrons, the momentum correlation of the two halo neutrons was extracted. It suggests that these neutrons have a strong tendency to move in the same direction.

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    Citation Excerpt :

    In lithium isotopes, this growth is observed in the transition from 6,7Li to 9Li and, especially, to 11Li. On the basis of analysis of measured interaction cross sections within the framework of the empirical approach and the Glauber approximation, a conclusion about a considerable extension of the neutron density in neutron-rich isotopes of these nuclei was made [13–16], which enabled the authors to propose and substantiate the hypothesis of a possible existence of the so-called neutron halo in some of them. The values of interaction radii for lithium isotopes, as well as the root-mean-square radii of distribution of matter, charge, and neutrons obtained using the Glauber theory are presented in Table 1 [13–16].

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