Abstract
We discuss in the framework of linear muffin-tin orbital method and Bahcall's calculations how the ratio of L- to K-shell electron capture rates $(L/K$ ratio) in ${}^{7}\mathrm{Be}$ would be affected by the host medium in which ${}^{7}\mathrm{Be}$ is implanted. Our calculations show that the recently observed discrepancy between the measured and observed $L/K$ ratio in ${}^{7}\mathrm{Be}$ could be understood quantitatively as a result of in-medium effects distorting the L-shell electron orbital of ${}^{7}\mathrm{Be}.$
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