Neutron halo in the exotic first excited state of Be
20154 pages
Published in:
- JETP Lett. 102 (2015) 7, 413-416,
- Pisma Zh.Eksp.Teor.Fiz. 102 (2015) 7, 467-470
- Published: 2015
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Abstract: (Springer)
Differential cross sections for elastic and inelasticBe + α scattering (the inelastic scattering leading to the 1.68- and 2.43-MeV states) were measured at the energies of 40 and 90 MeV. The radii of the excited states in question were determined on the basis of a modified diffraction model. The root-mean-square radius of the level at 1.68 MeV proved to be approximately 1 fm larger than the radii of both neighboring states. The reason is that, for this level, there is a neutron halo whose properties are similar to the properties of the known halo in theBe nucleus. This result is the first observation of a halo in an unbound state lying above the neutronemission threshold.References(12)
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