Excited state halos inBe10

摘要: The structure of certain bound excited states in {sup 10}Be have been shown to exotic features because their weak binding and cluster-like configurations. In this article, we investigate E1 E2 transitions between these compare the findings with recent experimental results. We predictions two types calculations: a microscopic multicluster model an ab initio no-core shell model. Both predict very similar transition strengths. By considering relative contributions from various matrix elements contributing arising coupling different 9}Bexn configurations wave functions making up states, conclude that B(E1;2{sup -}{yields}2{sub 1}{sup +}) can only be understood if 2{sup -} state (with separation energy its predominantly 1s{sub 1/2} neutron just 0.548 MeV) is clear halo state. Other nearby such as 2{sub 2}{sup +}, do not exhibit signature less than clean decoupling into well-defined 9}Be core plus neutron.